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Vanderveen MCML05 Step By Step Construction Manual

Valve pre-amplifier
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STEP BY STEP
CONSTRUCTION MANUAL
FOR THE
VANDERVEEN
VALVE PRE-AMPLIFIER
MCML05
Ir. Menno van der Veen
© Ir. bureau Vanderveen b.v.; May 2008; 1st release

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Summary of Contents for Vanderveen MCML05

  • Page 1 STEP BY STEP CONSTRUCTION MANUAL FOR THE VANDERVEEN VALVE PRE-AMPLIFIER MCML05 Ir. Menno van der Veen © Ir. bureau Vanderveen b.v.; May 2008; 1st release...

  • Page 2: General Information

    The text, content, figures and circuit diagrams included in this construction manual are protected by and are the property of Ir. buro Vanderveen. Copies of the content, or parts of it, in any material form, are prohibited without the explicit written permission of Ir. buro Vanderveen. The electronic design of this kit: circuit boards, diagrams, principles, and transformers also come fully under the copyright of Ir.

  • Page 3: Safety Instructions

    Amplimo b.v. Industrieweg 14 NL-7161 BX NEEDE The Netherlands Tel: +31(0)545-28 3456 Fax: +31(0)545 28 3457 Email: info@amplimo.nl Internet: www.amplimo.nl Ir. Bureau Vanderveen b.v. Sassenstraat 21 NL-8011 PA ZWOLLE The Netherlands Email: info@mennovanderveen.nl For possible future modifications: www.mennovanderveen.nl...
  • Page 4 EG verklaring...
  • Page 5 INTRODUCTION Dear buyer, Thank you for buying the MCML05 valve pre-amplifier. This pre-amplifier was born out of the love for music, faithful music reproduction and exceptional spatial image. This pre-amplifier is based on many years of experience and study by the designer. The latest techniques and knowledge are used in this design.

  • Page 8: List Of Components

    LIST OF COMPONENTS Resistors CODE VALUE TYPE QUANTITY MARKING 47kΩ ½ Watt carbon film yellow-violet-orange-gold 470Ω ½ Watt carbon film yellow-violet-brown-gold 1K2Ω ½ Watt carbon film brown-red-red-gold 1K2Ω ½ Watt carbon film brown-red-red-gold 1MΩ ½ Watt carbon film brown-black-green-gold 180KΩ ½...
  • Page 9 Capacitors CODE VALUE TYPE QUANTITY MARKING 220µF / 25V electrolytic cap radial 220u 25V 100nF / 100V capacitor radial MKT K100 220µF / 25V electrolytic cap radial 220u 25V 100nF / 100V capacitor radial MKT K100 220nF / 200V capacitor axial MKT 0.22uF 400V 12nF/100V capacitor radial MKT...
  • Page 10 TL072 op-amp TL072 Other items Cabinet lower part zincor black Cabinet upper part zincor black Front Front panel plastic grey MCML05 Knob knob black aluminium 50mm diam. Knob knob black aluminium 17mm diam. S-1 (a+b) switch toggle mains switch toggle MM/MC...
  • Page 11 CONSTRUCTION - general hints - 5W resistor jumper ¼W resistor Approx. 5mm from pcb Good Too little Too much Amount of solder MOUNTING COMPONENTS ON THE PCB Some examples for the mounting of axial components (= longitudinal leads) are drawn above. Determine length “L”...
  • Page 12 RESISTORS – colour code-index The value and tolerance of resistors are coded by coloured bands (three or four for value and one for tolerance). It is very important that you study the indexes printed below and pick and place the resistors very carefully. Resistors are not polarized; you don’t have to pay extra attention to correct positioning on the PCB.
  • Page 13 VOED-1.cdr Copyright ir.bureau Vanderveen oc tober 2003 Figure 1 1. One can recognize this circuit board by the text: "VDV-6, COPYRIGHT VANDERVEEN". side with this printed text is the correct side for mounting the components (component side). The other side of the PCB is for the soldered joints (solder side).
  • Page 14 STEP 2 – power supply circuit board – diodes VOED-2.cdr Copyright ir.bureau Vanderveen oc tober 2003 Figure 2 In general: diodes have a fixed polarity; they have a cathode and anode, of which the cathode is always marked. In the figures of this manual you can recognize the cathode by two adjacent...
  • Page 15 STEP 3 - power supply circuit board – resistors VOED-3.c dr Copyright ir.bureau Vanderveen oc tober 2003 Figure 3 Mount and solder these resistors close to the board. The holes in the PCB are plated-through, if it is more convenient you can solder the leads on the top side (=component side).
  • Page 16 STEP 4 – power supply circuit board – small capacitors VOED-4.cdr Copyright ir.bureau Vanderveen oc tober 2003 Figure 4 Mount and solder these small capacitors into place. Like the resistors these don’t have a fixed polarity you don’t have to pay extra attention to their orientation.
  • Page 17 STEP 5 - power supply circuit board – transistors and integrated circuits VOED-5.cdr Copyright ir.bureau Vanderveen october 2003 Figure 5 1: Transistor T1 has type number BC547B; solder it into place as indicated in figure 5. 2: IC-1 has type number TL071. This integrated circuit is to be mounted into a socket. This socket has a half round notch at one side as displayed in figure 5, mount and solder it in the correct position and orientation.
  • Page 18 STEP 6 & 7 – power supply circuit board - electrolytic capacitors VOED-6.cdr Copyright ir.bureau Vanderveen oc tober 2003 Figure 7 Electrolytic capacitors have a fixed polarity. All of this type of capacitor supplied with this kit have the negative terminal marked with either a black line on the housing or a “-“ symbol.
  • Page 19 STEP 8 – power supply circuit board – fuses and trimpots VOED-8.cdr Copyright ir.bureau Vanderveen oc tober 2003 Figure 8 A type of fuse used with this PCB might be unfamiliar to you. This type of fuse has a round plastic housing and two short leads, and in this application has to be mounted into a socket.
  • Page 20 All of the components are to be mounted on the side of the PCB side printed with: “VDV-VV INPUT-6 ; MC step-up VERSION ; COPYRIGHT 2003 ; VANDERVEEN” 1) Mount twelve solder terminals into the marked positions using the same procedure as with the power supply board.
  • Page 21 STEP 10 – input circuit board – input terminals , MC/MM-switch and input selector IN-3.c dr Cop yrig ht ir. burea u Vand ervee n oc tob er 2003 Figure 11 1) Solder the four gold plated input terminals into place on the input PCB. Remove the two little tabs either side of these terminals with a pair of pliers for easier mounting.
  • Page 22 STEP 11 – input circuit board – resistors, capacitors and step-up transformers IN-4.c dr Cop yrig ht ir. burea u Vand ervee n oc tob er 2003 Figure 12 1) Mount the step-up transformers MC-10 and solder into place. 2) Mount resistors R41 into the marked positions (½Watt 1000 ohm, brown black red + tolerance band) 3) If required mount Rc (2 off), Cc (2 off) and Rin (2 off).
  • Page 23 STEP 12 – MD-circuit board – valve sockets and solder terminals PU-MD-1.cd r Co pyright ir. b ure au Va nd erve en octobe r 2003 Figure 14 The side showing "VDV-VV: MD-5" is the correct side to mount all of the parts. 1) Mount the little solder terminals into the marked positions as described previously.
  • Page 24 STEP 13 – MD-circuit board – resistors PU-MD-2.cd r Co pyright ir. b ure au Va nd erve en octobe r 2003 Figure 15 All resistors are ½ Watt types, and are to be mounted on component side. If it is more convenient you can also solder the resistors this side. Please note, the values of resistors R16 and R17 are dependent on the type of valve applied in position B2.
  • Page 25 STEP 14 – MD-circuit board – capacitors PU-MD-3.cd r Co pyright ir. b ure au Va nd erve en octobe r 2003 Figure 16 1) Mount the MKH capacitors C12, 14, 16, 17, 20 Pay attention to their values, don’t exchange them otherwise the RIAA circuit won’t function properly.
  • Page 26 STEP 15 – MD-circuit board – electrolytic capacitors PU-MD-4.cd r Co pyright ir. b ure au Va nd erve en octobe r 2003 Figure 17 In this step you will mount the electrolytic capacitors, please take care to ensure the correct orientation.
  • Page 27 STEP 16 – line circuit board – solder terminals and valve sockets lijn-1.cd r Cop yright ir. b urea u Vande rveen oc tob er 2003 Figure 19 The side showing "Copyright 2003 VDV-LINE 5" is again the correct side to mount all components.
  • Page 28 STEP 17 – line circuit board – resistors lijn-2.cd r Cop yright ir. b urea u Vande rveen oc tob er 2003 Figure 20 All resistors are ½ Watt type; please study the colour codes below. Mount the following resistors: 560k = 560.000 ohm green blue yellow + tolerance band...
  • Page 29 STEP 18 – line circuit board – capacitors, relay and diode lijn-3.cd r Cop yright ir. b urea u Vande rveen oc tob er 2003 Figure 21 1) Mount relay Re (this relay operates when one connects a headphone) and the small red diode D1 (type 1N4148).
  • Page 30 Now the line circuit board is complete and finished. Please study figure 22 and check the opposite side for long protruding leads. lijn-4.cd r Cop yright ir. b urea u Vande rveen oc tob er 2003 Figure 22...
  • Page 31 MCML05 POT S COMPONE NT S IDE Figure 23 The side displaying "MCML05 POTS COMPONENT SIDE" is the correct side to mount the volume and balance control and the other small items. 1) First mount, align and solder the terminals.
  • Page 32 STEP 20 – final assembly – chassis, mains input, ground terminals, power transformer, mains switch EIND-1.cdr: Copyright ir. burea u Vanderveen oc tober 2003 Figure 24...
  • Page 33 1) To prevent scratching the cabinet during this assembly step we recommend starting with mounting the three feet using M4x8 screws. (never apply longer screws as these might touch the PCB or transformer) 2) Now whilst there is still good access, mount the four rubber grommets into the holes of the partition between supply and audio sections.
  • Page 34 11) Take a 25cm length of the widest heatshrink. Slide it over the transformer primary leads together with the red and black leads of the mains input. Please study figure 24. 12) Now take four 2cm lengths of the 3mm wide heatshrink. Slip these over each of the protruding leads, be sure to slip them far enough over the leads to prevent premature shrinking when soldering the wires to the switch (in stage 13).
  • Page 35 STEP 21 – mounting and wiring of the power supply and transistor T2 EIND-2a.c dr: Copyright ir. bureau Vanderveen oc tober 2003 Figure 25 1) Mount the power supply PCB as shown in figure 25 using four M3x5 screws.
  • Page 36 2) Now we are going to mount transistor T2. As this transistor generates some heat, it is placed against the partition which will conduct this heat away. eind-2b.cdr Copyright Ir. bureau Vanderveen october 2003 Figure 26 3) Take transistor T2 (type BDX33C) and lengthen each of the three terminals using 5cm lengths of red wire.
  • Page 37 8) Now solder the lengthened leads of T2 to the corresponding solder terminals on the PCB. Please study figures 26 and 27. test test 24 V test eind-2c.c d r Copyright Ir. bureau Vanderveen october 2003 Figure 27...
  • Page 38 9) Connect the thicker blue and grey transformer leads to their solder terminals on the PCB. Do not shorten these leads, but wind them around a pen to form a coil, these coils will effectively suppress high frequency interference from the mains. 10) Now solder the thinner yellow and red transformer leads to the corresponding solder terminals.
  • Page 39 EXPLANATION OF THE POWER SUPPLY - background information - During the construction of this amplifier this explanation can be omitted, however it can be of use at a later point to understand how the power supply works. For instance if you want to modify the circuit or if the power supply functions incorrectly.
  • Page 40 Filament supply slowly increasing in 15 seconds to 12.6V The secret behind this circuit is transistor T1. Capacitor C58 is slowly charged in 15 seconds through resistor R53. The voltage on the base of transistor T1 increases from 0 to 16V during this interval.
  • Page 41 Regulation of the high voltage Vo and the slow 30 seconds increase. The high voltage supply circuit is very simple. A stable 200V supply is achieved via R62 and two Zener-diodes D14 and D15. Capacitor C65 is charged via R63 in 30 seconds. This increasing voltage reaches the gate of mosfet T3 via R64 (this resistor also prevents oscillation of T3).
  • Page 42 STEP 22 – final assembly – mounting the audio PCB’s Ground S crew EIND-3A.cdr: Copyright Ir. Bureau Vanderveen B .V . november 2004 Figure 28...
  • Page 43 Mounting the input PCB: 1-a) Check the PCB for long protruding leads - trim if necessary. 1-b) This PCB is mounted with two different types of screw: four self tapping screws into the cinch input terminals through the back of the chassis, and two M3x5 screws onto the supports inside the chassis.
  • Page 44 STEP 23 – final assembly – power supply & headphone terminal EIND-3B.c dr: Cop yrig ht Ir. Bure au Va nderveen B.V. no ve mbe r 2004 Figure 29 Interconnection of power supply and audio boards.
  • Page 45 The four leads of the filament and high voltage supply are displayed in figure 29. Feed these through the hole in the partition next to transistor T2. The filament supply leads are colored green and yellow, the high voltage lead is red, the ground lead black.
  • Page 46 (all of the parts for these two examples are supplied with your kit) ZENER 150V 1 Watt SHORT SHORT LONG LONG LED powered by headphone LED powered by HIGH VOLT AGE EIND-4.c dr Copyright ir. bureau Vanderveen oc tober 2003 Figure 31...
  • Page 47 STEP 24 – final assembly – leads for audio signal path EIND-3C.c dr: Cop yright Ir. Bureau Va nderveen B.V. no ve mbe r 2004 Figure 32...
  • Page 48 Mount the control circuit board into the chassis as shown in figure 32. This PCB with control pots will be fixed using the two nuts and washers supplied with the Alps controls. High purity Siltech G5 gold injected silver-wire is used for the signal path wiring. This 0.5 mm wire is isolated with a material called Kapton.
  • Page 49 STEP 25 – final assembly – valves and cabinet Insert the shaft support into the front of the cabinet and fasten in place with the nut. Push the input selector shaft extension through the support in the cabinet; slide both shaft couplings over the shaft.
  • Page 50 Now you can fit the cover onto the cabinet using only two M4 screws at the rear of the cabinet. 10) However it is advisable to first read the next chapter “Initial power up” as the amplifier has yet to be tested for perfect operation.
  • Page 51 STEP 26 – initial power up - Check to see if the mains fuses (250mA time-lag) are fitted in the insert of the mains input. Connect a voltmeter (20VDC range) to the leads of the filament supply located at the line circuit board.

  • Page 52: Specifications

    SPECIFICATIONS LINE-CIRCUIT when valve B4 = 12AU7A = ECC82EH (Electro Harmonix) (only ECC82-circuit, unloaded) Aeff (Vol-max, Bal-mid, Z-load = 10k) Aeff (Vol-max, Bal-mid, Z-load = 100k) Zout kOhm kOhm (Vol-max, Bal-mid) kOhm (Vol-max, Bal-min) f-3L (Vol-max, Bal-mid, Z-load = 10k) f-3L (Vol-max, Bal-mid, Z-load = 100k) f-3H...
  • Page 53 EXPERIMENTS Experiment 1 The MC-1- step-up transformer. Please refer to the MC-10 attachment at the end of this manual how to optimize the MC-10 circuit to your pick-up cartridge. Experiment 2 The MD-phono circuit: a) The sequence of ECC82 and ECC81 valves can be exchanged for increased input amplification and decreased noise.
  • Page 54 The following articles will provide you with these necessary tools, and will explain many of the choices I made whist designing the MCML05 amplifier. 1) Ir. Menno van der Veen: “De Vanderveen MC-10”; manual MC-10 moving coil step-up transformer, 4 maart 2004 2) Stanley P.