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Amplimo Vanderveen UL40-S2 Construction Manual

Valve audio amplifier
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STEP BY STEP
CONSTRUCTION MANUAL
FOR
THE
UL40-S2
VALVE AUDIO AMPLIFIER
By: Menno van der Veen and Amplimo BV
© Ir. buro Vanderveen; May 2006; 4th release

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Summary of Contents for Amplimo Vanderveen UL40-S2

  • Page 1 STEP BY STEP CONSTRUCTION MANUAL UL40-S2 VALVE AUDIO AMPLIFIER By: Menno van der Veen and Amplimo BV © Ir. buro Vanderveen; May 2006; 4th release...

  • Page 2: General Information

    4) Acceptance by the buyer only takes places when the buyer has taken notice of the safety instructions on the following page of this manual. 5) Amplimo b.v. and Ir. buro Vanderveen will not entertain any claim, under any circumstance, if it is the result of not or only partially following the safety and building instructions.
  • Page 3 10cm above. Take care to prevent any fluids from entering the amplifier. If this happens, immediately disconnect the set from the mains supply and send the amplifier to Amplimo to be checked. Also note that the cover situated above the valves will become very warm. Take care at all times to prevent the cover from being touched (paying special attention to children).
  • Page 4 High End Valve Amplifiers with Toroidal Transformers”; all of which are available from Amplimo b.v.). In these the details of this design are extensively explained. The UL40-S2 is a revamped version of the original UL40-S, to which several improvements have been...
  • Page 5 275 V EL34 Inputs ( 4 x ) C4 470nF 125 V 630V B1-a 59 mA 1/2 6922 (or 1/2 6N1P) Amplimo ALPS - STEREO VDV6040PP 50k - AUDIO 250k VI O 220µF 100nF BLU (5 x) 25 V 100V...

  • Page 6: List Of Components

    LIST OF COMPONENTS CODE VALUE TYPE QUANTITY PRINTING Resistors 4,7kΩ 1W metal film ye-vi-blk-br-br 100kΩ 1W metal film br–blk–blk–or–br 2,2kΩ 1W metal film rd–rd–blk–br–br 47kΩ 1W metal film ye–vi–blk–rd–br 680Ω 1W metal film blu–gry–blk–blk–br 680Ω 1W metal film blu–gry–blk–blk–br 47kΩ 1W metal film ye–vi–blk–rd–br 1MΩ...
  • Page 7 T0,63A Slow-blow fuse 5x20mm switch Selector S1, S2 switch Toggle PAT4002 Output transformer VDV6040PP 6N536P Power transformer AMPLIMO PRINT1 PCB main double sided PRINT2 PCB input single sided PRINT3 PCB alps single sided 6922 Valve Electro Harmonix 2 B2, B3...
  • Page 8 CONSTRUCTION - general hints - 5W resistor jumper ¼W resistor Approx. 5mm from pcb Good Too little Too much Amount of solder MOUNTING OF COMPONENTS ON THE PCB Some examples for mounting axial components (= longitudinal leads) are drawn above. Determine length “L”...
  • Page 9 STEP 1 – main circuit board - Figure 1 SOLDER TERMINALS + FASTON CONNECTORS 1. The correct side for mounting the valve sockets is clearly marked on the circuit board (Dutch: BOVENKANT=BUISVOETKANT). The side for mounting the other components is also marked (Dutch: COMPONENTENKANT).
  • Page 10 STEP 2 – main circuit board – Figure 2 NOVAL and OCTAL VALVE SOCKETS 1. First mount the two smaller ceramic Noval (9 pin) sockets on the socket side (BUISVOETKANT), and solder them into place. Insert the 6922 valve into the socket prior to soldering for the best results as the prongs will now be correctly aligned.
  • Page 11 STEP 3 – main circuit board – Figure 3 0.1 µF CAPACITORS 1. Components that have been mounted so far are coloured turquoise in figure 3, while the parts which are to be mounted at this stage are coloured yellow. From now on this colour code will be used as this makes it easier to recognise what is required for each construction step.
  • Page 12 STEP 4 – main circuit board - Figure 4 ¼ WATT RESISTORS 1. Resistors R25, R30, R36, R37, R38 and R39 are all ¼ Watt types. These resistors are clearly recognisable because they are smaller then the pale blue 1 Watt metal film Beyschlag resistors.
  • Page 13 STEP 5 – main circuit board - Figure 5 DIODES and TRANSISTOR 1. Diodes D1-4 and D5-8 each are all type 1N4007. These black diodes carry a clear white ring marking the cathode. Each cathode is marked with a black line in figure 5. 2.
  • Page 14 STEP 6 – main circuit board - Figure 6 TRIMPOTS 1. Trimpots P2 (1 piece), P3 (2 pieces) and P4 (2 pieces) are now inserted into the PCB. 2. The value of each is clearly printed on the side. P2 = 250 k P3 = 100 k...
  • Page 15 STEP 7 – main circuit board - Figure 7 1 Watt RESISTORS, audio part 1 1. Resistors R2 up to and including R11 are used for the preamplifier and the phase splitter of the amplifier. They are all 1 Watt Beyschlag metal film resistors. 2.
  • Page 16 STEP 8 – main circuit board – Figure 8 1 Watt RESISTORS, audio part 2 1. Resistors R12, R14, R21, R22, R23 and R24 are also 1 Watt metal film resistors and are situated around the output valves. 2. These resistors do not get warm and may be mounted close to the PCB. 3.
  • Page 17 STEP 9 – main circuit board – Figure 9 1 Watt RESISTORS, quiescent current adjustment 1. Resistors R13, R15, R16, R18, R19 and R20 (together with trimpot P4) are part of the quiescent current adjustment circuit for the output valves. They do not belong to the audio circuit, but metal film resistors are used to guarantee long term stability.
  • Page 18 STEP 10 – main circuit board – Figure 10 Cathode and Supply Resistors 1. Resistor R17 is a 7 Watt resistor which has to be mounted 1cm above the PCB. This resistor radiates a lot of heat, but at a distance of 1cm the PCB will not get damaged (otherwise discolouration and even carbonization of the PCB will occur).
  • Page 19 STEP 11 – main circuit board – Figure 11 CAPACITORS, signal and HF supply decoupling Capacitors C4 and C5 (each 0.47µF / 630V, MKP = polypropylene) are used for the coupling between the preamplifier stage and phase splitter to the output valves. Mount them close to the PCB on the component side and SOLDER AT THE SOCKET SIDE.
  • Page 20 STEP 12 – main circuit board – Figure 12 CAPACITORS, audio electrolytic capacitors 1. Capacitor C1 (220µF, 25V) may be placed close to the PCB and soldered on the other side (socket side). Carefully check that the negative terminal (marked by a thick line on the capacitor) is in the correct position (see figure 12 pointing to the upperside) 2.
  • Page 21 STEP 13 – main circuit board – Figure 13 SUPPLY, capacitors + fuseholder 1. Capacitor C22 (220µF, 16-25V) is used in the LED circuit. This capacitor may be mounted close to the board, and has to be soldered at the socket side. Carefully check the polarity of this electrolytic capacitor.
  • Page 22 STEP 14 – main circuit board – Figure 14 The main circuit board is now complete. 1. The main board should appear as shown in figure 14 above. 2. All mounted components are drawn in. By comparing your board with this figure you can check if anything has been forgotten or inserted incorrectly.
  • Page 23 STEP 15 – final assembly - Figure 15 Main circuit board, Output transformers, Speaker terminals, Mains input 1. Mount the main circuit board into the cabinet using five M3 screws. Place a spring washer under the middle screw and tighten really tight as this provides the ground connection for the electronic circuit.
  • Page 24 3. The primary leads of each output transformer have the colour codes shown in figure 15. DO NOT CUT or SHORTEN these leads, but solder them to their terminals as shown in figure 15. It is important that you do not mistake one colour for another. 4.
  • Page 25 STEP 16 – final assembly - PLUS HIER UL40S2 COMPONENTENKANT COPYRIGHT 2000 Plaats hier R-C IR BURO Solderen, zie manual VANDERVEEN ALPS-PCB 40S2-f16.cdr Copyright 2000 Ir. Buro Vanderveen Figure 16 Input PCB, Input selector and Volume control 1. Solder the three solder terminals into place as shown in figure 18 on the next page. 2.
  • Page 26 3. Solder the two gold plated input terminals into place on the input PCB. For easier mounting remove the two little tabs either side of these terminals with a pair of pliers. 4. Now undo the two M3 screws on the input selector switch, insert them into the two holes in the PCB with the distance washers on top of it, then insert the switch terminals into the corresponding holes on the other side of the PCB, and tighten the screws.
  • Page 27 40s2-f19.cdr Copyright 2003 Ir. Buro Vanderveen 12. Mount on the Alps-PCB (smallest PCB) 7 solder terminals on the side with the wire-pattern. Align them according to figure 19 en solder them. 13. Mount the Alps-PCB to the Alps-volume control en solder the pins 14.
  • Page 28 STEP 17 – final assembly – Figure 17 Power transformer, Switches, LED's 1. Mount the power transformer using the supplied nut and bolt. First push the bolt through the hole on the top of the cabinet. Slide the transformer over the bolt, followed by the 5mm washer and then the nut.
  • Page 29 3. Slide the white nylon washer over the input selector shaft and then push the knob on so that there is just less than a 1mm gap between the knob and washer. Next tighten the screw in the knob. The white washer prevents damage to the input selector if someone pushes or something bumps against the knob.
  • Page 30 9. Take two pieces of 30cm long blue wire and solder them to the terminals “L” and “N” on the mains input connector; using the same procedure as before: first hook in the wire, then bend and solder. Slide 2cm lengths of the widest heatshrink over each wire and shrink them over the terminals.
  • Page 31 The amplifier is ready now. Check everything carefully for possible mistakes again! If you live in a country with a 230V mains voltage, the “115V” and “2A” markings at the rear of the cabinet have to be made illegible, using for instance, a black felt tip pen.
  • Page 32 STEP 18 – TESTING - ATTENTION: CAREFULLY FOLLOW THE SAFETY INSTRUCTIONS! 1. Plug the mains cord in and switch on the POWER switch, leaving the STAND-BY switch off. 2. The left red LED must light up now and the valves start to glow. 3.
  • Page 33 19.IF ANYTHING SEEMS WRONG AND YOU DO NOT HAVE SUITABLE MEASURING EQUIPMENT, CONTACT AMPLIMO SERVICE. PLEASE SEE THE INITIAL PAGES OF THIS MANUAL FOR INFORMATION. IF NECESSARY JUST CHECK THE AMPLIFIER VISUALY FOR FAULTS. IF YOU FIND ANY, FIRST SWITCH THE “STAND-BY” SWITCH TO “OFF”, WAIT A FEW MINUTES, THEN TURN THE “POWER”...
  • Page 34 STEP 19 – experiments - EXPERIMENTS WITH VALVE TYPES AND CONFIGURATIONS This is a universal design that allows the possibility of using various power valve types and some alternative valve configurations. So far the construction manual has only covered the ULTRA LINEAR configuration of the output valves.
  • Page 35 STEP 20 -TIPS- and THINGS WORTH KNOWING  Switching the amplifier on and off, the following sequence is advised: 1) Switch the "power" switch to 'on' 2) Wait for 1 minute 3) Now switch the "stand-by" switch to 'on'. 4) The amplifier is now ready for use. Explanation: by turning the "power"...