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Velleman-Kit K8011 Manual

Mono valve power amplifier module
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Total solder points: 600
Difficulty level:
beginner 1o 2o 3o 4o 5þ advanced
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
MANUAL
H8011P-ED1

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Summary of Contents for Velleman-Kit K8011

  • Page 1 1o 2o 3o 4o 5þ advanced 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 ⇒...
  • Page 2 COLOR= 2… 5 4K7= ( 4 - 7 - 2 - B ) 4K7= ( 4 - 7 - 0 - 1 - 1 ) COLOUR CODIFI- KLEUR CODICE CODIGO CODIGO VÄRI FÄRG FARVE FARGE FARB CODE CATION KODE SCHEMA DE COL- COLORE KOODI...

  • Page 3: Technical Data

    __________________________________________________________________________________________________________________________________________________________ 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 •...
  • Page 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. •...
  • Page 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.
  • Page 6 _______________________________________________________________________________________________________________________________________________________ 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.
  • Page 7 __________________________________________________________________________________________________________________________________________________________ 2. JUMPERS 3. JUMPERS FOR AC POWER SE- LECTION Note that from J1 to J4, two jumper wires have to be mounted in the same hole, for extra cur- For 100V input (mains), mount: rent handling. JA at the voltage selection 1 In order to get nice straight wiring, without too much folding and measuring, follow these hints:...
  • Page 8 _______________________________________________________________________________________________________________________________________________________ 4. DIODES (Check the polarity!) For 220V - 230V input, mount: JC at the voltage selection 1 D... CATHODE D1: 1N4148 JC at the voltage selection 2 D2 :1N4148 D3: 1N4007 D4: 1N4148 D5: 1N4007 D6: 1N4148 For 240V -245V mains input, mount: D7: 1N4148 JD at the voltage selection 1 D8: 1N4148...
  • Page 9 __________________________________________________________________________________________________________________________________________________________ R21: 10K (1 - 0 - 3 - B) 5. ZENER DIODES R22: 1K5 (1 - 5 - 2 - B) (Check the polarity!) R23: 1K2 (1 - 2 - 2 - B) R24: 560 (5 - 6 - 1 - B) R25: 100K (1 - 0 - 4 - B) R26: 220K (2 - 2 - 4 - B) ZD...
  • Page 10 _______________________________________________________________________________________________________________________________________________________ 7. 1W RESISTORS 8. LEDs (Check the polarity!) R... COLOR = 2...5 LD... CATHODE LD1: 5mm red (2) blinking R55: 270 (2 - 7 - 1 - B) LD2: 3mm bicolor, power / R56: 10K (1 - 0 - 3 - B) standby / on indication: R57: 10K (1 - 0 - 3 - B) R58: 12K (1 - 2 - 3 - B)

  • Page 11: Dip Switches

    __________________________________________________________________________________________________________________________________________________________ 9. IC SOCKETS 12. RESISTOR TRIMMERS (Check the position of the notch!) Horizontal type RV... IC... IC1: 18P RV1: 100K RV2: 100K 10. REED RELAY RV3: 100K (Check the position of the notch!) RV4: 100K RV5: 500K (470K) 13. TRANSISTORS PIN 1 T...
  • Page 12 _______________________________________________________________________________________________________________________________________________________ 14. 5W RESISTORS 16. CINCH / RCA CONNECTOR Mount it as straight and square as possible against the PCB. R... REMARK: You will have one 15 Ohm 5W resis- tors left over for later use. R73: 1E R74: 15 R75: 15 SK11: CINFP/90 15.
  • Page 13 __________________________________________________________________________________________________________________________________________________________ 18. VALVE SOCKET 20. POWER RELAYS The various relays have footprints that corre- spond to the footprints on the PCB : RY2: VR10V121C V... RY3: VR10V121C RY... Mount them square against the PCB V5: B9A RY4: VR5V122C V6: B9A 19.

  • Page 14: Electrolytic Capacitor

    _______________________________________________________________________________________________________________________________________________________ 22. ELECTROLYTIC CAPACITOR 23. TRANSFORMER (Check the polarity!) TRAFO... C... TRAFO1: 12VAC 24. ELECTROLYTIC CAPACITOR C14: 4µF7 (Check the polarity!) C15: 100µF Generally these capacitors are of the snap-in C16: 470µF type and cannot be mounted incorrectly. C17: 470µF C18: 470µF C19: 470µF C20: 47µF/100V...

  • Page 15: Valve Wiring

    __________________________________________________________________________________________________________________________________________________________ 25. INSERT THE IC (Check the position of the notch!) PIN 1 IC... IC1: LM3914 26. 6.3V VALVE WIRING Wiring for the 4 valve sockets V1 to V4. Use the supplied brown wire. Twist them as shown in the illustration.

  • Page 16: Final Assembly And Wiring

    _______________________________________________________________________________________________________________________________________________________ 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.
  • Page 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.
  • Page 18 _______________________________________________________________________________________________________________________________________________________ M8 NUT STEEL DISHED WASHER RUBBER WASHER TRANSFORMER RUBBER WASHER M8 BOLT FIG 5 • The output transformer (type ZD043) is mounted on the right hand side, in a similar way.
  • Page 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.
  • Page 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 •...
  • Page 21 __________________________________________________________________________________________________________________________________________________________...
  • Page 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. FIG 10...

  • Page 23: Final Inspection

    __________________________________________________________________________________________________________________________________________________________ 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). •...
  • Page 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.
  • Page 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.

  • Page 26: Troubleshooting

    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.
  • Page 27 __________________________________________________________________________________________________________________________________________________________ DIAGRAMS...

  • Page 28: Danger High Voltage

    BLACK SK17 GREEN 80VDC VIOLET 220VDC FROM OUTPUT TRANSFORMER 100VDC 75VDC 190VDC K8010: 3.6VDC K8011: 0.4VDC K8010: 3.6VDC K8011: 0.4VDC TO POWER ON SWITCH SK18 VELLEMAN P8010'1 / P8011'1 DANGER HIGH VOLTAGE K8010: 3.6VDC K8010: 3.6VDC K8011: 0.4VDC K8011: 0.4VDC...
  • Page 29 __________________________________________________________________________________________________________________________________________________________ DIAGRAM POWER SUPPLY SECTION...
  • Page 30 _______________________________________________________________________________________________________________________________________________________ DIAGRAM AMPLIFIER SECTION...

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