Total solder points: 600 Difficulty level: beginner 1o 2o 3o 4o 5þ advanced

MANUAL H8010P-ED1

MONO PURE CLASS A VALVE POWER AMPLIFIER

K8010 ⇒ Pure CLASS A valve sound with high quality KT88 valves ⇒ High quality chrome plated enclosure ⇒ Chrome plated valve socket covers ⇒ Easy bias adjustment with LED indication ⇒ Removable bottom for easy access and service ⇒ High quality capacitors and components ⇒ Gold plated input and speaker terminals ⇒ Standby function ⇒ Soft start circuit for power transformer ⇒ Sensitivity adjustment for exact matching of two mono amps

Specifications

• Full class A 65Wrms in 4 or 8Ω • Bandwidth: 4Hz to 90KHz (-3dB/1W) • Harmonic distortion: 0.1% @ 1W/1KHz • Signal to noise ratio: >110dB (A weighted) • Input sensitivity: 1Vrms (adjustable) • Power supply: 100, 120, 230 or 245VAC • Power consumption: 230VA max. • Dimensions: 355W x 360D x 157H • Weight: 14Kg / 31lb modifications reserved

5%

4K7= ( 4 - 7 - 2 - B )

1%

4K7= ( 4 - 7 - 0 - 1 - 1 )

COLOR= 2… 5

I P E SF S DK N D GB F NL CODE

CODICE COLORE

CODIGO DE

CORES

CODIGO DE COL-

ORES

VÄRI KOODI

FÄRG SCHEMA

FARVEKODE

FARGEKODE

FARB KODE

COLOUR CODE

CODIFI-CATION DES COU-LEURS

KLEURKODE

CODE

0 Nero Preto Negro Musta Svart Sort Sort Schwarz Black Noir Zwart 0 1 Marrone Castanho Marrón Ruskea Brun Brun Brun Braun Brown Brun Bruin 1 2 Rosso Encarnado Rojo Punainen Röd Rød Rød Rot Red Rouge Rood 2 3 Aranciato Laranja Naranjado Oranssi Orange Orange Orange Orange Orange Orange Oranje 3 4 Giallo Amarelo Amarillo Keltainen Gul Gul Gul Gelb Yellow Jaune Geel 4 5 Verde Verde Verde Vihreä Grön Grøn Grønn Grün Green Vert Groen 5 6 Blu Azul Azul Sininen Blå Blå Blå Blau Blue Blue Blauw 6 7 Viola Violeta Morado Purppura Lila Violet Violet Violet Purple Violet Paars 7 8 Grigio Cinzento Gris Harmaa Grå Grå Grå Grau Grey Gris Grijs 8 9 Bianco Branco Blanco Valkoinen Vit Hvid Hvidt Weiss White Blanc Wit 9 A Argento Prateado Plata Hopea Silver Sølv Sølv Silber Silver Argent Zilver A B Oro Dourado Oro Kulta Guld Guld Guldl Gold Gold Or Goud B

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3

TECHNICAL DATA* • Output power: 65 Wrms class A / 85Wrms maximum • Output impedance 4 or 8 Ohm • Ultra linear output transformer • Switch-on delay, to protect the output tubes: approx. 1 minute • Standby circuit • Built-in bias current indicator • Switch-on delay for the supply transformer : 0.5s • Power bandwidth: 8Hz - 45kHz (-3dB, ref. 50W) • Frequency range: 4Hz - 90kHz (-3dB, ref. 1W) • Harmonic distortion:

0.1% (1 kHz/1W) 0.7% (1 kHz/65W)

• Signal/noise ratio: > 110dB (A weighted wrt 85W) • Input impedance: 100Kohm • Input sensitivity min 1Vrms, adjustable. • Damping factor (100Hz): > 12 • Power supply: 100, 120, 230, 245VAC • Power consumption: 230Wmax. / 66W standby • Dimensions: 355W x 360D x 157H *Modifications and typographical errors reserved

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4

1. Assembly (Skipping this can lead to troubles ! ) Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully. 1.1 Make sure you have the right tools: • A good quality soldering iron (25-40W) with a small tip. • Wipe it often on a wet sponge or cloth, to keep it clean;

then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and will protect the tip, and enables you to make good connections. When solder rolls off the tip, it needs cleaning.

• Thin raisin-core solder. Do not use any flux or grease. • A diagonal cutter to trim excess wires. To avoid injury when cutting excess leads,

hold the lead so they cannot fly towards the eyes. • Needle nose pliers, for bending leads, or to hold components in place. • Small blade and phillips screwdrivers. A basic range is fine.

For this projects, a basic multi-meter is required

1.2 Assembly Hints : þ Make sure the skill level matches your experience, to avoid disappointments. þ Follow the instructions carefully. Read and understand the entire step before you perform each op-

eration. þ Perform the assembly in the correct order as stated in this manual þ Position all parts on the PCB (Printed Circuit Board) as shown on the drawings. þ Values on the circuit diagram are subject to changes. þ Values in this assembly guide are correct* þ Use the check-boxes to mark your progress. þ Please read the included information on safety and customer service * Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as ‘NOTE’ on a separate leaflet. 1.3 Soldering Hints :

Mount the component against the PCB surface and carefully solder the leads

Make sure the solder joints are cone-shaped and shiny

Trim excess leads as close as possible to the solder joint

0.000

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5

ASSEMBLY OF THE MAIN PCB P8010: Foreword: For best results and easy handling of the large PCB (Printed Circuit Board), we will start by putting the four large valve sockets in place. This will allow us to rest the board on the bench, without having the component leads touching the bench surface. When the component leads are put in the appropriate holes on the PCB, we recommend to gently bend the leads outwards, so they stay on the board when it is flipped over to apply solder. You gain a reason-able amount of time if you put approx. 10 components in place every time, before you flip the board, and make the solder joints.

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6

15mm M3 SPACER

12mm SPACER

PCB

VALVE SOCKET

20mm M3 BOLT

1. VALVE SOCKET MOUNTING Check the position of the notch in the centre of the valve socket, it must correspond to the position of the notch in the circle printed on the PCB. Connect the leads to the corresponding isles on the PCB using a small piece of supplied jumper wire. IMPORTANT: Make the connection exactly as shown in the illustration, otherwise the small piece of wire could touch the bottom of the cabinet, see further.

23

41

3

57

4

6

58

1

8

q V1 q V2 q V3 q V4

Also mount a 15 mm spacer on the following holes in the PCB (at the solder side); use a 6 mm M3 bolt: q A spacer next to TRAFO1 q A spacer next to SK15 q A spacer next to SK6 q A spacer next to R62 q A spacer next to V6

6mm M3 BOLT

15mm M3 SPACER

2 7

1

8

54

3

V...

Connect the valve socket terminals 1, 3, 4, 5, and 8 to the corresponding points at the solder side of the PCB. Use a piece of supplied jumperwire. Mount the wire in such way that it can-not touch the bottom of the cabinet. (see above illustration).

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7

2. JUMPERS

q J1 (mount 2 wires in the same hole) q J2 (mount 2 wires in the same hole) q J3 (mount 2 wires in the same hole) q J4 (mount 2 wires in the same hole) q J5 q J6 q J7 q J8 q J9 q J10 q J11 q J12 q J13 q J14 q J15 q J16 q J17 q J18 q J19 q J20 q J21 q J22 indicated with ‘F1’

(mount 2 wires in the same hole)

3. JUMPERS FOR AC POWER SE-LECTION For 100V input (mains), mount: q JA at the voltage selection 1

D

C

B

A

q JA at the voltage selection 2 D C B A

For 115V - 120V input, mount: q JB at the voltage selection 1

D

C

B

A

q JB at the voltage selection 2

D C B A

Note that for J1 to J4, two jumper wires have to be mounted in the same hole, for extra cur-rent handling. TIP In order to get nice straight wiring, without too

much folding and measuring, follow these hints:

• Put the jumper wire in place. • Solder one end of the lead. • Then carefully pull on the free end of the

lead until it is straight, and apply solder.

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8

For 220V - 230V input, mount: q JC at the voltage selection 1

D

C

B

A

q JC at the voltage selection 2

D C B A

For 240V -245V mains input, mount: q JD at the voltage selection 1

D

C

B

A

q JD at the voltage selection 2

D C B A

REMARK: Strike out the NOT used mains voltage indica-tion at the back of the enclosure !! Use a per-manent black marker

4. DIODES (Check the polarity!)

D...CATHODE

q D1: 1N4148 q D2 :1N4148 q D3: 1N4007 q D4: 1N4148 q D5: 1N4007 q D6: 1N4148 q D7: 1N4148 q D8: 1N4148 q D9: 1N4007 q D10: 1N4007 q D11: 1N4007 q D12: 1N4007 q D13: 1N4007 q D14: 1N4007 q D15: 1N4007 q D16: 1N4007 q D17: 1N4007 q D18: 1N4007 q D19: 1N4007 q D20: 1N4007 q D21: 1N4007 q D22: 1N4007 q D23: 1N4007 q D24: 1N4148 q D25: 1N4148 q D26: 1N4148 q D27: 1N5408 not on tape ! q D28: 1N5408 not on tape ! q D29: 1N5408 not on tape ! q D30: 1N5408 not on tape !

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9

5. ZENER DIODES (Check the polarity!)

ZD...CATHODE

q ZD1: 3V9 q ZD2: 3V9

6. ¼W & ½W RESISTORS

R...

q R1: 470 (4 - 7 - 1 - B) q R2: 220K (2 - 2 - 4 - B) q R3: 2K2 (2 - 2 - 2 - B) q R4: 2K2 (2 - 2 - 2 - B) q R5: 220K (2 - 2 - 4 - B) q R6: 100K (1 - 0 - 4 - B) q R7: 1K (1 - 0 - 2 - B) q R8: 1K (1 - 0 - 2 - B) q R9: 22K (2 - 2 - 3 - B) q R10: 3.3 (3 - 3 - B - B - 9) q R11: 3K9 (3 - 9 - 2 - B) q R12: 1K5 (1 - 5 - 2 - B) q R13: 1M (1 - 0 - 5 - B) q R14: 1M (1 - 0 - 5 - B) q R15: 1K (1 - 0 - 2 - B) q R16: 47K (4 - 7 - 3 - B) q R17: 470K (4 - 7 - 4 - B) q R18: 680 (6 - 8 - 1 - B) q R19: 3K9 (3 - 9 - 2 - B) q R20: 10K (1 - 0 - 3 - B)

q R21: 10K (1 - 0 - 3 - B) q R22: 1K5 (1 - 5 - 2 - B) q R23: 1K2 (1 - 2 - 2 - B) q R24: 560 (5 - 6 - 1 - B) q R25: 100K (1 - 0 - 4 - B) q R26: 220K (2 - 2 - 4 - B) q R27: 100K (1 - 0 - 4 - B) q R28: 220K (2 - 2 - 4 - B) q R29: 10K (1 - 0 - 3 - B) q R30: 2K7 (2 - 7 - 2 - B) q R31: 1M5 (1 - 5 - 5 - B) q R32: 1K5 (1 - 5 - 2 - B) q R33: 3.3 (3 - 3 - B - B) q R34: 8K2 (8 - 2 - 2 - B) q R35: 220K (2 - 2 - 4 - B) q R36: 10K (1 - 0 - 3 - B) q R37: 100K (1 - 0 - 4 - B) q R38: 220K (2 - 2 - 4 - B) q R39: 100K (1 - 0 - 4 - B) q R40: 220 (2 - 2 - 1 - B - 9) q R41: 100K (1 - 0 - 4 - B - 9) q R42: 47K (4 - 7 - 3 - B - 9) q R43: 220 (2 - 2 - 1 - B - 9) q R44: 220 (2 - 2 - 1 - B - 9) q R45: 220 (2 - 2 - 1 - B - 9) q R46: 2K2 (2 - 2 - 2 - B - 9) q R47: 27K (2 - 7 - 3 - B - 9) q R48: 220 (2 - 2 - 1 - B - 9) q R49: 220 (2 - 2 - 1 - B - 9) q R50: 100K (1 - 0 - 4 - B - 9) q R51: 330K (3 - 3 - 4 - B - 9) q R52: 330K (3 - 3 - 4 - B - 9) q R53: 330K (3 - 3 - 4 - B - 9) q R54: 330K (3 - 3 - 4 - B - 9)

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7. 1W RESISTORS

R...

2mm

q R55: 270 (2 - 7 - 1 - B) q R56: 10K (1 - 0 - 3 - B) q R57: 10K (1 - 0 - 3 - B) q R58: 12K (1 - 2 - 3 - B) q R59: 39K (3 - 9 - 3 - B) q R60: 39K (3 - 9 - 3 - B) q R61: 39K (3 - 9 - 3 - B) q R62: 100K (1 - 0 - 4 - B) q R63: 47K (4 - 7 - 3 - B) q R64: 47K (4 - 7 - 3 - B) q R65: 47 (4 - 7 - 0 - B) q R66: 47 (4 - 7 - 0 - B) q R67: 180 (1 - 8 - 1 - B) q R68: 180 (1 - 8 - 1 - B) q R69: 180 (1 - 8 - 1 - B) q R70: 47 (4 - 7 - 0 - B) q R71: 47 (4 - 7 - 0 - B) q R72: 180 (1 - 8 - 1 - B)

8. LEDs (Check the polarity!)

LD...

COLOR = 2...5

CATHODE

q LD1: 5mm RED (2) BLINKING q LD2: WILL BE MOUNTED

LATER, SEE SECTION 27 q LD3: 3mm YEL (4) q LD4: 3mm YEL (4) q LD5: 3mm YEL (4) q LD6: 3mm YEL (4) q LD7: 3mm GREEN (5) q LD8: 3mm GREEN (5) q LD9: 3mm RED (2) q LD10: 3mm RED (2) q LD11: 3mm RED (2) q LD12: 3mm RED (2) q LD13: 3mm RED (2) (next to R61)

9. IC SOCKETS (Check the position of the notch!)

IC...

1

q IC1: 18P

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11

10. REED RELAYS (Check the position of the notch!)

PIN 1

1

RY...

q RY1: VR05R121

11. DIP SWITCHES

1

SW...

Check that switch 1 corresponds to pin 1. q SW2: DS-4P

12. RESISTOR TRIMMERS Vertical type

RV...

q RV1: 100K q RV2: 100K q RV3: 100K q RV4: 100K Horizontal type

RV...

q RV5: 500K (470K)

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12

13. TRANSISTORS

T...

T...

T...

T...

q T1: BC516 q T2: BC547C q T3: BC547C q T4: BC547C

14. 5W RESISTORS

R...

2mm

REMARK: You will have one 15 Ohm 5W resis-tors left over for later use. q R73: 15 q R74: 15 q R75: 15

15. PCB BLADE TERMINALS Mount them as straight AS possible against the PCB. A good solder joint is very important !

SK...

q SK1: 4 Ohm q SK2: GND q SK3: 8 Ohm q SK4: BLUE q SK5: RED q SK6: YELLOW q SK7: GRAY q SK8: GRAY q SK9: GREEN q SK10: GREEN q SK21: EARTH q SK22: EARTH

16. CINCH / RCA CONNECTOR Mount it as straight and square as possible against the PCB.

q SK11: CINFP/90

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13

17. PCB TERMINAL BLOCK some blocks slide into each other !

Mount these terminals with the wire inputs fac-ing the PCB edge: q SK12: 2 POLE (large)

q SK13: 3 POLE q SK14: 3 POLE q SK15: 3 POLE

q SK16: 3 POLE q SK17: 3 POLE SK18 to SK20 are not mounted

18. VALVE SOCKET

5 9

8

7

4

3

2

V...6 1

Mount them straight against the PCB q V5: B9A q V6: B9A

19. SWITCH

SW...

SIDE VIEW

IMPORTANT:Don't leave a gap betweenthe SWITCH and the PCB!

Mount it as square as possible against the PCB, Also solder the metal support. q SW1: 3P ON-ON-ON

20. CAPACITORS

C...

Check the voltage rating! q C1: 47nF (473, 0.047, 47000) q C2: 100pF (101) q C3: 330pF/400V (331) q C4: 330pF/400V (331) q C5: 68n/630V (683, 0.068) q C6: 68n/630V (683, 0.068) q C7: 68n/630V (683, 0.068) q C8: 68n/630V (683, 0.068) q C9: 68n/630V (683, 0.068) q C10: 68n/630V (683, 0.068) q C11: 680n/160V (684, 0.68) q C12: 680n/160V (684, 0.68) q C13: 680n/160V (684, 0.68)

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14

21. POWER RELAYS The various relays have footprints that corre-spond to the footprints on the PCB: q RY2: VR10V121C q RY3: VR10V121C

RY...

q RY4: VR5V122C

RY...

22. ELECTROLYTIC CAPACITOR (Check the polarity!)

C...

q C14: 4µ7 q C15: 100µF q C16: 470µF q C17: 470µF q C18: 470µF q C19: 470µF q C20: 47µF/100V q C21: 100µF/100V q C22: 1000µF q C23: 4700µF q C24: 47µF/350V q C25: 47µF/350V q C26: 100µF q C27: 1µF

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15

23. TRANSFORMER

TRAFO...

q TRAFO1: 12VAC

24. ELECTROLYTIC CAPACITOR (Check the polarity!) Generally these capacitors are of the snap-in type and cannot be mounted incorrectly.

C...

q C28: 100u/400V q C29: 220u/450V q C30: 220u/450V q C31: 220u/450V

25. INSERT THE IC (Check the position of the notch!)

IC...PIN 1

1

q IC1: LM3914

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16

26. 6.3V VALVE WIRING

q Wiring for the 4 valve sockets V1 to V4. Use the supplied brown wire. Twist them as shown in the illustration. The polarity is not important. For safety, it is advisable to check with an ohmmeter that the two 6.3V terminals are not shorted when the wiring is completed.

VIEWED FROM SOLDERSIDE

4

3

3

4

55

6

V4

1

8

2 1

7 8

f4

6.3VAC

f4f3 f3

6.3VACf2 f2

8

8

1

675

4

1

V1

2 3

3

5

4

f1 f1

41

8

8

675

12

V2

3

3

5

4

4

3

3

4

55

6

V3

8

1

2 1

7 8

27. SPECIAL LED (Check the polarity!) q LD2: 3mm bicolor: Carefully check the mounting of this LED:

1 2

LD...2

3

1 3

5mm

5mm

LD2 ONLY !

Check the complete assembly again for errors. Pay special attention to bad sol-der joints, shorts and wrongly inserted or misplaced components !

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17

ASSEMBLY INTO THE CABINET:

• Mount the caged nuts into the square holes as shown in the illustration. These nuts are later used to fasten the covers.

CLICK INTO HOLE

FIG 1 • Mount the chromed feet on the four cabinet corners, with an M4 bolt. To avoid scratches on other

equipment, you can stick a piece of felt on every foot (not supplied). • Mount a shakeproof washer and a 15mm threaded spacer on the front and back studding as shown

in the illustration.

15mm M3 SPACER

M3 LOCK WASHER

M3 BOLT

FIG 2 • Position the PCB in the cabinet, and fasten at the bottom with the supplied black button head hexa-

gon socket screws (Use the supplied Allen key). At the component side of the PCB, two M3 bolts fasten the PCB on the threaded spacers we mounted in the previous step.

• The mains inlet located at the back of the enclosure will be flush mounted as shown in the illustra-tion. Use two black button head hexagon socket screws , together with a shakeproof washer and an M3 nut.

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18

M3 LOCK WASHERM3 NUT

M3 BOLT

MAINS INLET

FIG 3

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19

• Make the connections as shown. Use the supplied blue wire for the neutral (N) terminal, and brown wire for the live (L) terminal.

FIG 4 The earth terminal is hooked up with green/yellow striped wire. The female push-on connector on the

green/yellow striped wire must be soldered for best results.

SOLDER

FIG 5 Connect the earth wire to SK21 on the PCB. Remove the fuse holder lid, and insert a miniature glass

fuse. For mains voltages of 100-125VAC, use the supplied 8A slow-blow fuse, while for 220-240VAC operation the 4A slow-blow fuse needs to be fitted. The spare fuse can also be stored in the fuse holder lid.

• Mounting of the speaker terminals: Mount them as shown in the diagram. Watch the position of the plastic insulator rings : one is flat, while the other has an elevated ring on the inside. There is no need to mount the solder lugs.

NUTNUT

INSULATOR RING

SPEAKER TERMINAL

INSULATOR RING

FIG 6 HINT : For easy fastening of the speaker terminals, immobilise the terminal by inserting a screwdriver in the wire hole, while fastening the nuts. IMPORTANT: The speaker terminals must be electrically isolated from the metal enclosure. For safety, check for infinite resistance between every terminal and the metal enclosure.

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20

• Use the supplied 1,5mm² wire to make the connections. For best results, solder the female push-on connector (fig 5). Apply enough heat, in order to make a good solder joint.

FIG 7 • Mounting of the toroid transformers : The output transformer marked ZD043 must be fitted according

to the illustration, on the right hand side of the cabinet. Watch the location of the wires.

OUTPUT TRANSFORMER

RUBBER WASHER

RUBBER WASHER

M8 BOLT

STEEL DISHED WASHER

FIG 8

! IMPORTANT: Do not trim the wires of the transformers, leave them at their original length. If there is more than one conductor in an insulating sleeve, you have to make sure they are soldered together and make a good electrical connection before they are connected to the terminal block.

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21

• Connect the double yellow wire with the connector marked ‘YELLOW’ SK6. Connect the red wire with the connector marked ‘RED’ SK5. Connect the blue wire with the connector marked ‘BLUE’ SK4. Use the supplied female push-on connectors (fig 5) and solder them onto the wires ! Connect the remaining wires to the terminal blocks SK16 and SK17. Pay attention to the colors.

FIG 9

• The supply transformer must be fitted according to the illustration, on the left hand side of the cabinet. Watch the location of the wires. The sturdy grey and green wires, which supply the 6,3V filament voltage, must sit on top.

STEEL DISHED WASHER

RUBBER WASHER

RUBBER WASHER

POWERTRANSFORMER

M8 BOLT

FIG 10

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22

• Connect the grey wires to the connectors marked SK7 and SK8 (GRAY). Connect the green wires to the connectors marked SK9 and SK10 (GREEN). Connect the remaining leads to the terminal blocks SK13, SK14 and SK15

FIG 11

FINAL INSPECTION :

! WARNING : THE PCB CARRIES VOLTAGES THAT EXCEED 400V ! THESE VOLTAGES CAN KILL ! MAKE SURE NO ONE CAN TOUCH ANY LIVE PARTS

Use suitable isolated measuring equipment • Put the mains switch into its fully OFF position (all the way down). • Connect the unit to a wall outlet, by means of the supplied cord. In some countries, the supplied plug

will not fit the local wall outlets. If this is the case, cut the supplied plug, and replace it with a suitable one (not included). Make sure to wire it correctly : blue : neutral (N), brown : live (L), yellow/green : earth. If the mains voltage is present, LD2 should light continuously red.

• Turn the unit on by pushing the mains switch to its fully upward position. LD2 should now blink for a while, this indicates the standby mode. After approximately one minute, LD2 should light continuously green, indicating ‘ON’, and a relay should click.

• Now check the following voltages with a multimeter: Measure about 6.3VAC between SK7-SK8 and SK9-SK10 Measure about 6.3VAC between pins 2 and 7 of the tube sockets V1 to V4 (illustration)

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23

FIG 12

! SWITCH OFF THE UNIT AND REMOVE THE MAINS PLUG. WAIT A COUPLE OF MINUTES UNTIL THE DANGEROUS HIGH VOLTAGE HAS DISSAPEARED

(UNTIL HIGH VOLTAGE INDICATOR LD13 TURNS OFF) • Put the small valves in place:

V6 type ECC82 or 12AU7, CV491, 6189, 8136 V5 type ECC81 or 12AT7, CV455, 6201, 8162

• Reconnect the mains plug, and switch the unit ON again (switch in full upward position) Wait until LD2 lights green continuously.

• Now check all indicated voltages on the PCB with respect to ground. A suitable ground for these measurements is J4, at the centre of the PCB. The point indicated VB2 should carry approx. 3.5VDC.

REMARK : All voltages may vary a bit, due to mains voltage fluctuations. At this stage, you cannot measure the 3.6VDC voltages yet.

CALIBRATION Switch off the unit, disconnect the mains plug and wait until the high voltage has disappeared. Turn the trim potentiometers RV1 to RV4 fully counter clockwise with a small screwdriver. Put the four KT88 or equal tubes in their sockets. Watch the position of the notch. IMPORTANT : The remaining 15 Ohm / 5W resistor must be hooked up between the centre and the 8 ohm speaker terminal at the back of the unit. A valve amplifier must never be operated without a suitable load at the speaker terminals. Make sure there is a good electrical connection between the terminals and the resistor. Bias current calibration This calibration does not require a measuring instrument, as the bias level of each tube can be displayed on the LED scale. The four dipswitches allow valve selection, while each valve has its own trim potentiometer. RV1 controls V1, RV2 controls V2 etc… IMPORTANT : This calibration determines the bias current trough the expensive output valves. Therefore, it requires your absolute attention. Perform the calibration in the correct order. No signal may be present at the input of the amplifier, during the calibration. Flip all four DIP switches (SW2) to their OFF position Every switch enables the bias readout of one valve, so do not switch on more than one at a time, or the readout will be incorrect. Reconnect the mains plug, and switch the unit ON again (switch in full upward position) Wait until LD2 lights green continuously.

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24

Put the first switch in the ON position (use a pen or a small screwdriver) Gently turn RV1 clockwise until the second or third LED lights (LD4 or LD5) Switch off the first switch. Switch on the second switch Gently turn RV2 clockwise until the second or third LED lights (LD4 or LD5) Perform the same operation with RV3 and RV4 Wait for about 10 minutes, before continuing the rest of the calibration. Repeat the calibration of RV1 to RV4, but this time the trim potentiometers must be turned clockwise until one or two green LEDs light. When this operation is finished, check the 3.6V DC voltages at R65, R66, R70 and R71. Again, use J4 as ground reference.

FINALLY ! It is time to listen to your amplifier ! Switch off the unit completely before connecting or disconnecting any cables. Connect a 4 or 8 ohm speaker to the correct terminals at the back of the unit. Speakers with imped-ances between 4 and 8 ohms can be connected to the 8 ohm terminal. The common negative speaker terminal is located in between the 4 and 8 ohm positive terminals. Hook up an audio source to the RCA connector at the back. Make sure the volume control of the source is set to minimum before the unit is turned on. The ‘SENSITIVITY’ trimmer located at the centre of the board allows you to trim the amplifiers input sensitivity, so two units put out exactly the same level, which improves the stereo image. Normally, this trimmer should be set fully clockwise. If necessary, feed a mono signal to both amplifiers, and trim both sensitivity trimmers, until the sound comes from the exact centre between both loudspeakers. • Valve amplifiers run hot ! Operate them in a well ventilated area ! Do not put them in a closed

rack, stack or cabinet. • It is a good habit to check the bias current on a regular basis, especially when the valves are

new. • They need to run-in for a while, during which the bias level may shift. • For short intervals between listening sessions, put the amplifier in stand-by mode (mains

switch in middle position).

FINISHING THE ENCLOSURE ASSEMBLY • Check if none of the components on the PCB will touch the chromed cover plates, when they are put

in place. • Turn the unit, so it rests on its left or right hand side. • This allows you to fasten the bottom lid, by means of the supplied black button head hexagon socket

screws. • Click the caged nuts into their holes on the chromed vertical plate (Be careful not to scratch the sur-

face). • Mount the chromed cover plate on the chromed vertical plate with two silver button head hexagon

socket screws. Tighten by hand. • Position this assembly onto the enclosure, and put the silver button head hexagon socket screws in

place. Tighten them by hand. Connect the chromed vertical plate to SK22 (chassis earth) with a

__________________________________________________________________________________________________________________________________________________________

25

length of yellow/green striped wire and 2 female push-on terminals. Make sure you solder both ter-minals. (See fig 5)

• Mount the top cover on the enclosure (Make sure the earth lead of the vertical plate is bent down, so it does not get squeezed between the lid and the enclosure). Use the supplied black button head hexagon socket screws.

• Mount the front panel. Use the supplied right angle mounting brackets, together with the shakeproof washers and the M3 and M4 bolts. Take care of the correct position of the mains switch and LD2.

• Make sure everything fits well, and tighten all screws.

! THIS AMPLIFIER RUNS HOT, OPERATE IT OUT OF THE REACH OF CHILDREN !

CHECK YOUR MAINS VOLTAGE MAKE SURE IT MATCHES THE SELECTED VOLTAGE

REMOVE THE MAINS PLUG AND WAIT AT LEAST 15 MINUTES BEFORE REMOVING THE COVERS

SOME PARTS MAY CARRY DANGEROUS VOLTAGES, EVEN WHEN THE UNIT IS UNPLUGGED

TROUBLESHOOTING Hum coming from the speakers : To make sure the amplifier is the source of hum, short the RCA input (by means of a spare male RCA plug, which you short internally), and disconnect the earth connector SK21. As a reference, listen at about 1m (3 ft) from the speaker, there should be an negligible amount of hum present. If there’s still a reasonable amount of hum present, check the bias current of every valve. Also check the electrical connection between the PCB ground and the enclosure, which is done trough the bolt next to R1. A defective valve can also be a source of hum. If hum is only present, when the amplifier is hooked up to an audio system, then a hum-loop could be the cause. To verify if this is the case, disconnect SK21 Use good quality, as short as possible, interconnecting leads. For best results, choose equal lengths for both left and right amplifier. If the high tension is not present, check the transformer wiring and the mains fuse, located at the back of the unit, below the mains inlet. An intermitted crackling sound coming from the speakers could point to a defective resistor R62. Replace it with the same value and power rating. A continuous buzzing sound coming from the speakers or a crackling sound during bass peaks could be caused by oscillation of the amplifier. In this case, try raising the value or R46 (e.g. 2K7 or even 3K3). This will also slightly increase the input sensitivity. If your speaker system includes a piezo driver, make sure it has a 10 ohm/ 1W resistor in series with the unit. THE MODIFICATIONS MENTIONED ABOVE ARE ONLY TO BE PERFORMED WHEN REPEATED INSPECTION OF THE CIRCUIT BOARD, SOLDER JOINTS AND WIRING DID NOT POINT TO ANY OBVIOUS FAULTS OR MISTAKES OF ANY KIND.

_______________________________________________________________________________________________________________________________________________________

26

REMARK: Valves are very sensitive to mechanical shocks. Therefore, we recommend not to move the unit when the valves are hot. Always let them cool down for a while. Avoid sudden temperature changes, e.g. when the unit is moved from a cold room to a heated room. Always leave it idle for a while, so it can adapt to the new environmental condition. A valve that breaks down starts glowing cherry red. Turn off the unit immediately. Usually, the 47 ohm/1W cathode resistor of the defective valve will also need replacement. If you have the impression that for some reason, the unit still does not operate as it should, you can send it to our technical dept. for inspection. Send the PCB only, not the enclosure or the transformers. Use the original box. Include a detailed description of the fault. Check www.velleman-kit.com for your nearest Velleman dealer. Velleman wishes you many hours of listening pleasure !

__________________________________________________________________________________________________________________________________________________________

27

DIAGRAMS

_______________________________________________________________________________________________________________________________________________________

28

PCB

R37

DANGERHIGH VOLTAGE

R11

R62

R63

f2

3

D23

D22

D21

LD1

R24

R23

SW1

1LD2

R22

D24

5

4

3

R65

R70

LD11

VELLEMAN P8010'1 / P8011'1

RE

D

2

1 3

R25

R52

R51R26

R28

R27

R29

R21

LD6LD4LD3

YE

LL0W

LD5 LD9LD7 LD8

GR

EE

N

GR

EE

N

LD10

RE

D

RE

D

R69

V2

R68

V1

8

1

C3

R13

R64

V5

1 9

R34

R54R53

R71

C26

D25 D

26

LD12

RE

D

R33

IC1

R32

1

R35

R36

V3

V6

R66

R46 1

R20

R50

R19

9

SK12

L

D18

D17D19

D20

C18

AC POWER

N

R45

D12

D11B

LAC

K

BR

OW

N

YE

LLO

W

YE

LLO

W

RY3

C19

ZD2T4

R74 R75

R8

TRAFO1

12VA

C

245V

RY4

D7

D8

R44

f1

C29

6.3VACGRAY GRAY

C30

C21

C20

R9

BLU

ESK15

RY2

RE

D

D30

6.3VAC

D29

C31

R48

GREEN

D27

D28D10

D9

J2

R56

R57

C28

R49

J3

R58

J1

R42

R6

ZD1D1

R4R5

D6

D3

T2

R55

D5

C15

C16

C14T1

D4T3

D2

C17

R3

R1

R2

SK11

R7C2

C1

PCB CONNECTED TO MAINS

R72

HIGH VOLTAGE

R38

R39

!

R67

BLACK

GREEN

VIOLET

V4

SK16

ORANGE

BROWN

BLACK

J4

J5 J6

J9

J7

J8

J10

J12

J19

J20

J21

J11

R30

C9

C10

C7 C8

230V

120V

100V

0

DC

BA

VO

LTA

GE

S

ELE

CT

ION

1

A: 100VACB: 120VACC: 230VACD: 245VAC R

ED

OR

AN

GE

VIO

LET

D C B A

SELECTION2

VOLTAGE

C5R12

f4f3

J14J13

R73 R59

R60

R61

LD13

A: 100VACB: 120VACC: 230VACD: 245VAC

C24 C25

R41

YELLOWREDBLUE8 OhmGND4 Ohm

C4

R15

C6RV5

R17

R18

R47

R16

R14

C11

C12

C13

C22

R10D

14D

13 D15

D16

C23

R40

R43

f5 f6

f7 f8GREEN

SK20

31

RV1 RV2 RV3 RV4

SK19

2

1

3

4

6

5

J15 J16 J17

J18

SK1 SK2 SK3 SK4 SK5 SK6

FROM OUTPUT TRANSFORMERTO LOUDSPEAKER TERMINALS

SK7 SK8

SK9SK10

SK13

R31

SENSITIVITY

FROM POWER TRANSFORMER

FROM OUTPUT TRANSFORMER

TO POWER ON LED

TO POWER ON SWITCH

SW2

1

RY11

HIGH VOLTAGE INDICATOR

K8011: 0.4VDC

12VDC

-50VDC

390VDC395VDC

155VDC

190VDC

300VDC

80VDC

75VDC

220VDC

100VDC

VB2

VB1

K8010: 3.6VDC

K8011: 0.4VDCK8010: 3.6VDC

K8011: 0.4VDCK8010: 3.6VDC

K8011: 0.4VDCK8010: 3.6VDC

BIAS CURRENT ADJUST

VB1 K8010: 1.6VDC K8011: 0.2VDC

VB2 K8010: 3.5VDC K8011: 0.45VDC

SK14

SK17

2x

2x

2x

2x

SK18

F1

100-120V/8A Slow230-245V/4A Slow

3

4

5 8

1

3

4

58

1

5

4

3

1

8

1

2

3 6

5

4

SK22

SK21

2x J22

C27

YE

LL0W

YE

LL0W

YE

LL0W

456 3

21

2

__________________________________________________________________________________________________________________________________________________________

29

DIAGRAM POWER SUPPLY SECTION

D19

1N40

07

12V

AC

/2.5

VA

TRA

FO1

N8A S

LOW

@ 1

00/1

20V

AC

F1

MA

INS

L

7

1

0

5 311

5V

245V

94A

SLO

W @

230

/245

VA

C

LD4

RE

D18

4

R33

4.7

D26

1N41

48R

3412

K2

V-

1LD

3

RE

D

2.5

300V

DC+V

1

+V2

C30

100u

/400

V

R4

2K2

BC

516

T1

R56

10K

/1W

D11

1N40

07

D12

1N40

07BC

547C

T3

R3

2K2

LD2 L-

93W

EG

W RY

3

VR

10V

121C

3V9

ZD2

R75

15/5

W

C19

470u

RY

4V

R5V

122C

R74

15/5

W

D7

1N41

48

R8

1K

BC

547C

T4

D8

1N41

48

50V

/0.1

A

0

BLA

CK

BLU

E

120V

GR

EE

Nf3 f2 f1

6.3V

/7A

GR

AY

GR

AY

f4G

RE

EN

6.3V

/7A

YE

LLO

W

PO

WE

R T

RA

NS

FO

RM

ER

VIO

LET

245V

RE

D29

0

0

290V

/0.7

A

YE

LLO

W

RE

D

D22

1N40

07

D23

1N40

07

LD1

L-56

BH

D

GR

EE

N

D24

1N41

48

12V

DC C

1847

0uR

1

470

D18

1N40

07

D17

1N40

07

D20

1N40

07

R23 1K

2

RE

D

R24

560

D21

1N40

07

ON

SW

1

OF

F

ST

B

C16

470u

C15

100u

R22

1K5

R2

220K+V

ZD

1

3V9

C144u

7

R5

220K

D1

1N41

48

D5

1N40

07

RY

2

VR

10V

121C

C27

220u

/450

V

R51

330K

/0.5

W

R53

330K

/0.5

W

R54

330K

/0.5

W

R52

330K

/0.5

W-VR

9

22K

C20

47u/

100V

D10

1N40

07 BIA

S4

BIA

S2

BIA

S3

BIA

S1

D30

1N54

08

D29

1N54

08D

271N

5408

D28

1N54

08

D9 1N

4007

R57

10K

/1W

-50V

DC

390V

DC C26

100u

3

R32

1K5

2 431

D25

1N41

48

SW

2

6IC

1

7 8A

DJ

RLO

RE

F

1716

LM39

14

1514

9 5

RH

I

SIG

MO

DE

131210 11C29

220u

/450

V

C28

220u

/450

V

R58

12K

/1W

+V

V+

D3

1N40

07

D2

1N41

48 D4

1N41

48

BC

547C

T2

R55

270/

1W

D6

1N41

48

C17

470u

SI

LD12

RE

D

3.75

LD8

GR

EE

N

LD7

GR

EE

N

LD6

RE

D

LD5

RE

D

3.25

3 2.75

3.5

LD9

RE

D

LD10

RE

D

LD11

RE

D

4.25

44.75

4.5

C21

100u

/100

V

R59

39K

/1W

R60

39K

/1W

R61

39K

/1W

LD13

RE

D

R31

10M

100V24

230V

R73

15/5

W

BR

OW

N

100VO

RA

NG

E

230V

R30

3K9

D C B A

AD

B

C

395V

DC

NC

_______________________________________________________________________________________________________________________________________________________

30

DIAGRAM AMPLIFIER SECTION

-50V

DC R

2622

0K

R21

10K

R29

10K

R28

220K R38

220K

R20

10K

R36

10K

C1

47n

R6

100K

C2

100p

C7

68n/

630V

R13

1M

GR

AY

GR

AY

6.3V

AC

R19 3K

9

R43

220/

.5W

6.3V

AC

GR

EE

N

R40

220/

.5W

f4

GN

D

GR

EE

Nf3

RY

1V

R05

R12

1A

13

62S

I

78

114

R44

220/

.5W

R39

100K

R37

100K

R45

220/

.5W f2

C4

330p

R46

2K2/

.5W

R15 1K

f1

8

C8

68n/

630V

R64

47K

/1W

RV

3

100K

-V-V

RV

410

0K

f1f2

75V

DC

59

4

3

R35

220K

EC

C82

C25

47u/

350V

V6

INP

UT

R7

1KIN

190V

DC

RV

210

0KR

V1

100K

300V

DC

R62

100K

/1W

110V

DCR11 3K

9

R50

100K

/.5W

V5

7

EC

C81

R41

100K

/.5W

C3

330p

/400

V+V2

R63

47K

/1W

C5

68n/

630V

2

61

C10

68n/

630V

220V

DCR27

100K

C9

68n/

630V

R25

100K

-V

BLA

CK

GR

EE

N

VIO

LET

3.6V

DC

BIA

S3

R67

180/

1W

45

3

1

f3

V4

KT

882

f4R

6647

/1W

8

7

R72

180/

1W3

453.

6VD

C

1

f4f3

KT

88V

3

27

R71

47/1

W BIA

S4

8G

ND

GN

DLS

RE

D

OR

AN

GE

BR

OW

N

BLA

CK

3.6V

DC

BIA

S1

8

f12

f2

R65

47/1

W

7

3

54

R68

180/

1WK

T88 V1 1

8B

IAS

2

f2f12

7R

7047

/1W

390V

DC

+V1

V2

KT

88

54

R69

180/

1W3

3.6V

DC

1

4 O

hm

8 O

hmB

LUE

YE

LLO

W

TR

AN

SF

O3

ZD

043

6

2 38

59

4R

1868

0

R47

27K

/.5W

R16

47K

R17

470K

RV

550

0K

R14

1M

C6

68n/

630V

C13

680n

/160

V

D14

1N40

07

D13 1N

4007

D16

1N40

07

D15

1N40

07

R10

3.3/

.5W

C23

4700

u

C22

1000

uR

4922

0/.5

WR

4822

0/.5

W

R12

1K5

1

7

R42

47K

/.5W

C24

47u/

350V

155V

DC

C12

680n

/160

V

C11

680n

/160

V

80V

DC