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Total solder points: 600 Difficulty level: beginner 1o 2o 3o 4o 5þ advanced
MANUAL H8011P-ED1
MONO VALVE POWER AMPLIFIER MODULE
K8011 ⇒ Pure valve sound with EL34 valves ⇒ Easy bias adjustment with LED indication ⇒ High quality capacitors and components ⇒ Standby function ⇒ Soft start circuit for power transformer ⇒ Single PCB ensures hassle-free assembly and wiring ⇒ High quality toroid transformers ⇒ Sensitivity adjustment for exact level matching of two mono amps ⇒ A special chassis plate is also available, order code: CHP8011
Specifications
• 90Wrms in 4 or 8Ω (at rated mains voltage) • Bandwidth: 2Hz to 125KHz (-3dB/1W) • Harmonic distortion: 0.1% @ 1W/1KHz • Signal to noise ratio: 104dB (A weighted) • Input sensitivity: 1Vrms min. (adjustable) • Supply voltage: 100, 120, 230 or 245VAC • Stand by power consumption: 60W • Maximum power consumption: 230W • PCB dimensions: 245 x 320mm (9.65” x 12.6”) 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
MONO VALVE AMPLIFIER MODULE TECHNICAL DATA* • Output power: 90 Wrms (at rated supply voltage) • Output impedance 4 or 8 Ohms • Ultra linear toroid output transformer • Switch-on delay, to protect the output valves: approx. 1 minute • Standby circuit • Built-in bias current indicator • Switch-on delay for the supply transformer: 0.5s • Power bandwidth: 8 - 45kHz (-3dB, ref. 50W) • Frequency range: 2 Hz - 125kHz (-3dB, ref. 1W) • Harmonic distortion: 0.1% (1 kHz/1W) • Signal/noise ratio: > 104dB (A weighted wrt 90W) • Input impedance: 100Kohm • Input sensitivity: 1Vrms minimum (adjustable) • Damping factor (100Hz): > 10 • Supply voltage: 100, 120, 230 or 245VAC • PCB dimensions: 245 x 320mm *We reserve the right to make changes.
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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
operation. 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 P8011: 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 reasonable 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
8mm SPACER
PCB
VALVE SOCKET
15mm M3 BOLT
1. VALVE SOCKET MOUNTING Check the position of the notch in the centre of the tube socket, it must correspond to 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 remaining 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 q A spacer next to SK19
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
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 from 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
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: 4E7 (4 - 7 - B - B) q R31: 1M5 (1 - 5 - 5 - B) q R32: 1K5 (1 - 5 - 2 - B) q R33: 33K (3 - 3 - 3 - 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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10
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: 10 (1 - 0 - 0 - B) q R66: 10 (1 - 0 - 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: 10 (1 - 0 - 0 - B) q R71: 10 (1 - 0 - 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: 3mm bicolor, power /
standby / on indication: Carefully check the mounting of this LED:
1 2
LD...2
3
1 3
If wanted, above LED can also be mounted on a front panel. Then please use wires to make the connec-tions 1, 2 and 3. Use the PCB termi-nal SK20 (see later 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)
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11
9. IC SOCKETS (Check the position of the notch!)
IC...
1
q IC1: 18P
10. REED RELAY (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-4
12. RESISTOR TRIMMERS Horizontal type
RV...
q RV1: 100K q RV2: 100K q RV3: 100K q RV4: 100K q RV5: 500K (470K)
13. TRANSISTORS
T...
T...
T...
T...
q T1: BC516 q T2: BC547C q T3: BC547C q T4: BC547C
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12
14. 5W RESISTORS
R...
2mm
REMARK: You will have one 15 Ohm 5W resis-tors left over for later use. q R73: 1E 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 SK21 and SK22 will not be used
16. CINCH / RCA CONNECTOR Mount it as straight and square as possible against the PCB.
q SK11: CINFP/90
17. PCB TERMINAL BLOCK some blocks slide one into each other !
Mount these terminals with the wire inputs fac-ing the PCB edge (except for SK20, which should be mounted facing LD1. 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 q SK18: 3 POLE q SK19: 3 POLE q SK20: 3 POLE
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13
18. VALVE SOCKET
5 9
8
7
4
3
2
V...6 1
Mount them square against the PCB q V5: B9A q V6: B9A
19. 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)
20. 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...
21. FUSE HOLDER + FUSE
F...
q F1: Fuseholder + cover q 4A FUSE @ 230 - 245V or q 8A FUSE @ 100 - 110V
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14
22. ELECTROLYTIC CAPACITOR (Check the polarity!)
C...
q C14: 4µF7 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
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 C31 will not be used
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15
25. INSERT THE IC (Check the position of the notch!)
IC...PIN 1
1
q IC1: LM3914
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
f8
6.3VAC
f7f6 f5
6.3VACf4 f3
8
8
1
675
4
1
V1
2 3
3
5
4
f2 f1
41
8
8
675
12
V2
3
3
5
4
4
3
3
4
55
6
V3
8
1
2 1
7 8
Check the complete assembly again for errors. Pay special attention to bad sol-der joints and wrongly inserted or misplaced components !
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16
27. FINAL ASSEMBLY AND WIRING Please pay attention to the following hints, for best results : • Mount the module on a grounded metal chassis. • A suitable chassis can be ordered separately (order code CP8011) • The PCB ground is automatically connected to the metal chassis by means of the metal spacer located
next to the RCA input. A 470 Ohm resistor avoids hum loops. • Provide plenty of ventilation, as tubes run very hot. • Use the provided mains inlet, together with a suitable 3-conductor mains cord (not included). • For best results, position the transformers as described. • Take care about electrical safety. The PCB carries lethal voltages ! Mounting of the optional CHP8011 chassis • Bend the rear plate as show in the illustration. Pay attention to the right bending direction.
FIG 1 • Mount the switch a shown in the illustration.
FIG 2 • Mount the LED, using the included support (see illustration).
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17
FIG 3 • Fasten the mains inlet with two suitable bolts and nuts.
M3 BOLT
M3 NUT
FIG 4 • Fasten the PCB to the chassis with M3 bolts. • Mount the supply transformer (the smallest of both transformers) on the left hand side as shown in the
illustration. Use the supplied rubber washer and M8 bolt.
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18
M8 BOLT
RUBBER WASHER
TRANSFORMER
RUBBER WASHER
STEEL DISHED WASHER
M8 NUT
FIG 5 • The output transformer (type ZD043) is mounted on the right hand side, in a similar way.
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19
Wiring : The mains inlet : The earth pin must be hooked-up to the chassis as shown in the illustration. Use a length of yellow/green wire and the supplied ring crimp terminal.
FIG 6 Connect the mains inlet with SK12 on the PCB. Use suitable leads of at least 0.5mm²
FIG 7 REMARK : Fill out the included power rating label, and stick it onto the chassis or enclosure, on a clearly visible location. The transformers :
! 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 a screw terminal. Power transformer : • Connect the power transformer with the connectors marked ‘FROM POWER TRANSFORMER’ on the
PCB. • Connect the sturdy grey wires to the connectors marked SK7 and SK8 (GRAY) . The remaining green
wires must be hooked-up to the connectors marked SK9 and SK10 (GREEN).
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20
Output transformer (ZD043): • 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 female push-on connectors and solder them to the wires for best results.
SOLDER
FIG 8 • Connect the remaining leads to the connectors SK16 and SK17. Pay attention to the colors. Function switch : • Use an appropriate length of the supplied multicore cable and make the connection between the switch
and SK18 as shown by the illustration.
123
456
1
23
4
56
SWITCH
FIG 9
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21
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22
Function LED : • Use an appropriate length of the supplied multicore cable and make the connection between the two-
color LED and SK20 as shown by the illustration. Pay attention to the correct position of the LED.
1 3
1 3
FIG 10
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23
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 an appropriate 3 conductor cord.
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
FIG 11
! 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. 0.45VDC.
REMARK : All voltages may vary a bit, due to mains voltage fluctuations. At this stage, you cannot measure the 0.4VDC voltages yet.
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24
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 EL34 (C6A7, CV1741) 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. 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 0.4V DC voltages at R65, R66, R70 and R71. Again, use J4 as ground reference.
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25
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 on the PCB. Speakers with impedance’s be-tween 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. 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).
! 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
_______________________________________________________________________________________________________________________________________________________
26
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 mains earth connector. 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 chassis, 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 the mains earth. 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. 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
D11
BLA
CK
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
4
56 3
2
1
2
__________________________________________________________________________________________________________________________________________________________
29
DIAGRAM POWER SUPPLY SECTION
D19
1N40
07
12V
AC
/2.5
VA
TR
AF
O1
N8A S
LOW
@ 1
00/1
20V
AC
F1
AC
PO
WE
R
L
7
10
5 311
5V
245V
94A
SLO
W @
230
/245
VA
C
LD4
RE
D18
4
R33
33K
D26
1N41
48R
348K
22
V-
1LD
3R
ED
0.2
300V
DC+V
1
+V2
C28
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
0B
LAC
K
BLU
E
120V
GR
EE
Nf5
-6
f3-4
f1-2
6.3V
/7A
GR
AY
GR
AY
f7-8
GR
EE
N
6.3V
/7A
YE
LLO
W
PO
WE
R T
RA
NS
FO
RM
ER
VIO
LET
245V
RE
D29
0
029
0V/0
.7A
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
STB
C16
470u
C15
100u
R22
1K5
R2
220K+V
ZD1
3V9
C144u
7
R5
220K
D1
1N41
48
D5
1N40
07
RY
2
VR
10V
121C
C29
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 11C31
220u
/450
VC
3022
0u/4
50V
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
0.34
LD8
GR
EE
NLD
7G
RE
EN
LD6
RE
DLD
5R
ED
0.28
0.26
0.23
0.31
LD9
RE
D
LD10
RE
D
LD11
RE
D0.
39
0.37
0.45
0.42
C21
100u
/100
V
R59
39K
/1W
R60
39K
/1W
R61
39K
/1W
LD13
RE
D
R31
1M5
100V24
230V
R73
1/5W
BR
OW
N
100VO
RA
NG
E
230V
R30
4.7
D C B A
AD
B
C
395V
DC
NC
C27
1u
_______________________________________________________________________________________________________________________________________________________
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
f7
GN
D
GR
EE
Nf6
RY
1V
R05
R12
1A
13
62S
I
78
114
R44
220/
.5W
R39
100K
R37
100K
R45
220/
.5W f3
C4
330p
R46
2K2/
.5W
R15 1K
f2
8
C8
68n/
630V
R64
47K
/1W
RV
3
100K
-V-V
RV
410
0K
f2f3
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
0.4V
DC
BIA
S3
R67
180/
1W
45
3
1
f6
V4
EL3
42
f8R
6610
/1W
8
7
R72
180/
1W3
450.
4VD
C
1
f7f5
EL3
4V
3
27
R71
10/1
W BIA
S4
8G
ND
GN
DLS
RE
D
OR
AN
GE
BR
OW
N
BLA
CK
0.4V
DC
BIA
S1
8
f32
f1
R65
10/1
W
7
3
54
R68
180/
1WE
L34
V1 1
8B
IAS
2
f4f22
7R
7010
/1W
390V
DC
+V1
V2
EL3
4
54
R69
180/
1W3
0.4V
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
f8f5f1 f4