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Vanderveen MCML05 Step By Step Construction Manual Download Page 46

 

46

Function of the LED above the headphone terminal.

 

8)  There is a little hole in the front panel just above the headphone terminal; this is for the 

yellow LED supplied with the kit. The function of this LED is not specified and neither does 
it appear on the circuit diagram. It is up to the constructor of the amplifier to decide what to 
do with it, for instance it can be used with the 24V supply and the remaining switch of the 
headphone socket.

 

9)  Figure 31 shows two examples.  

Example 1: 

If the yellow LED is connected in series with a 3300 Ohm resistor (soldered to 

the long terminal) & to the 24V supply then the LED will light up when a jack plug is 
connected to the headphone terminal. Take a 7cm length of narrow heatshrink and slide it 
over both the longest terminal of the LED as well as the entire length of the series resistor 
and solder to the correct terminal on the power PCB. Slide a 4 cm length of heatshrink over 
the shorter terminal of the LED and solder it to terminal “6” of the headphone socket. Solder 
a length of wire between terminal “5” of this socket and the PCB terminal.  

Example 2:

 The yellow LED can be powered by the high voltage supply, connected in 

series with a 150V Zener diode and a 10,000 Ohm resistor. The brightness will gradually 
increase in approx. 15 seconds after the power is switched on simultaneously with the 
ramping up of the high voltage supply.  It is very important to use heatshrink (the narrow 
kind) for isolation. Slide a 10cm length over the longest terminal of the LED, Zener diode 
and resistor and a 4cm length over the shorter LED terminal. Note that you will need to 
lengthen the leads with appropriate lengths of wire before sliding the heatshrink over and 
solderering both to their PCB terminals as shown in figure 31. 

(all of the parts for these two examples are supplied with your kit) 

 

S1

S1

LONG

SHORT

3k

3

10

k

EIND-4.c dr   Copyright ir. bureau Vanderveen   oc tober 2003

LONG

ZENER  150V

SHORT

LED powered by headphone

LED powered by HIGH VOLTAGE

1 Watt

1 W

a

tt

 

Figure 31 

Summary of Contents for 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: ...s of the construction kit fall under these guarantee conditions The guarantee does not cover destruction or damage by misuse This is determined exclusively at the discretion of Amplimo b v The following example clarifies this Every transformer is thoroughly checked before delivery If it is found that the transformer is defective Amplimo b v could conclude that the damage has been caused by misuse ...

Page 3: ...ou will find the so called EG verklaring van overeenstemming with explanations To meet the terms of this declaration the constructor has to follow ALL directions and conditions 13 Make sure that there is sufficient room around the amplifier for ventilation at least 3cm is required each side and 10cm above Take care to prevent any fluids from entering the amplifier If this happens immediately disco...

Page 4: ...4 EG verklaring ...

Page 5: ...ower supply This automatically controls the increase of filament supply in 15 seconds from zero to the final value The same applies to the high voltage supply which will reach its stabilized value in approx 30 seconds The switching on of this pre amplifier happens in such a smooth controlled way that we have omitted the now superfluous stand by mode We gave the pre amplifier a separate output on t...

Page 6: ...0k R16 C16 12 nF 100V 1M R17 LINE in MC MC MD MD CD DVD RADIO REC out Output REC in LINE 100k BX2 100k C18 C17 220 pF 3 9 nF S 3 S 2 ECC82EH 12AU7A ECC81 ECC82 B4 B3 B2 LINE out 220 nF 1uF 200V C21 R18 C10 0 35 mV R e 100E 1k 1k 47 uF 47 uF 47 uF 250V 250V 250V 100nF 100nF 100nF 200V 200V 200V V 0 V 1 V 1 C36 C24 C22 C37 C25 C23 R36 R23 R22 V 2 S witch Sh in HPh socket activates the Re coil when H...

Page 7: ...T1 T2 BUZ80 T3 100k 1W Gekoeld op vin 47 V P3 C67 R63 R64 R65 C68 C69 C68 69 100nF 100V C70 C71 470 uF 470 uF 25 V 25 V 14V 14V 100 R60 DCEL 16 IC2 IC1 R52 R53 BRN BRN WHT WHT BLK BLK PNK PNK BLU GRY RED YEL GRN ORA 7805 A B Z2 160 mA T C D Z3 160 mA T E F Rd La Lc 1W FFp FFm 53 3V 40 7V Vo Go 197V 0 V 197V V V 10 nF 10 nF 1200 V 1200 V 12 IC3b IC3a 220k 220k 100k 100k 10pF 10pF 12V 12V 8 7 6 5 4 ...

Page 8: ... 1KΩ Watt carbon film 1 brown black red gold R53 47KΩ Watt carbon film 1 yellow violet orange gold R54 15KΩ Watt carbon film 1 brown green orange gold R55 10KΩ Watt carbon film 1 brown black orange gold R56 1KΩ Watt carbon film 1 brown black red gold R57 1KΩ Watt carbon film 1 brown black red gold R58 1K5Ω Watt carbon film 1 brown green red gold R60 100Ω 1 Watt metal film 1 brown black black black...

Page 9: ...V electrolytic cap radial 1 100u 25V C59 1nF 10V capacitor radial MKT 1 1n 400 C60 100µF 25V electrolytic cap radial 1 100u 25V C61 100µF 25V electrolytic cap radial 1 100u 25V C62 10nF 1200V capacitor radial MKP 1 10n 1K2 C63 10nF 1200V capacitor radial MKP 1 10n 1K2 C64 220µF 385V electrolytic cap radial 1 220uF 400V C65 47µF 250V electrolytic cap radial 1 47u 400V C66 47µF 250V electrolytic cap...

Page 10: ...nduct cabinet partition 4 Heatsink for T3 metal black 1 Isolationset for T2 en T3 complete 2 Solder terminal ceramic lug pcb mount 71 Solder terminal tag M3 3 way 1 Foot 3 Mains cord complete 1 Assembly materials M3x10mm screw counter sunk black 2 for mains input M3x 5mm screw pan head zinc plated 14 for pcb s M3x12mm screw thumbscrew zinc plated 1 phono ground M4x 8mm screw pan head zinc plated 5...

Page 11: ...m power 30 75 Watt 2 Only use the high quality solder supplied in the kit This contains silver and a resin core 3 Briefly preheat the contact and the lead to be soldered by touching both parts at the same time with the soldering iron 4 Then introduce the solder letting it flow properly round the lead 5 Use of the correct amount of solder is very important see figure above 6 Visually check the join...

Page 12: ... Watt resistors 3 1 bands in total COLOUR BAND 1 BAND 2 BAND 3 black bl 0 0 x 1 brown br 1 1 x 10 red rd 2 2 x 100 orange or 3 3 x 1K yellow ye 4 4 x 10K green grn 5 5 x 100K blue bl 6 6 x 1M violet vi 7 7 x 0 1 grey gry 8 8 x 0 01 white wt 9 9 TOLERANCES brown 1 red 2 gold 5 EXAMPLE brown green yellow gold 150kΩ 5 COLOUR CODE INDEX 2 for 1 Watt resistors 4 1 bands in total COLOUR BAND 1 BAND 2 BA...

Page 13: ...e of the PCB is for the soldered joints solder side The same applies to the four other circuit boards of this amplifier 2 First push the 23 small solder terminals into their holes on the component side of the PCB using a pair of pliers and align them as shown in figure 1 Solder them into place to ensure a nice flat surface first bend the pins aside with a knife before soldering 3 This mounting met...

Page 14: ...step 1 Diodes D5 8 are all type BY550 the larger black ones and must be mounted 5mm above the circuit board This allows these diodes to radiate heat more effectively 2 Diodes D10 13 are type 1N4007 the smaller black ones and these can be mounted close to the PCB 3 Diodes D14 and D15 are Zener diodes which are used for the 100VDC regulation Mount these close to the board please inspect these carefu...

Page 15: ...k red tolerance band R58 1k5 1500 ohm brown green red tolerance band R60 1 W 100 ohm brown black black black tolerance band R61 1 W 100k 100000 ohm brown black black orange tolerance band R62 47k 47000 ohm yellow violet orange tolerance band R63 220k 220000 ohm red red yellow tolerance band R64 10k 10000 ohm brown black orange tolerance band R65 150k 150000 ohm brown green yellow tolerance band R6...

Page 16: ...resistors these don t have a fixed polarity you don t have to pay extra attention to their orientation C54 100nF 0 1µF µ1 100V C55 100nF 0 1µF µ1 100V C57 100nF 0 1µF µ1 100V C59 1nF 400V C62 10nF 1K2 1200V C63 10nF 1K2 1200V C68 100nF 0 1µF µ1 100V C69 100nF 0 1µF µ1 100V C81 10pF the little blue 100J C82 10pF the little blue 100J C90 100nF 0 1μF μ1 63V C91 100nF 0 1μF μ1 63V ...

Page 17: ...ng the middle lead forward a little text side is at the front 5 Transistor T3 has type number SPP04N80C3 This transistor generates some heat has to be mounted with a heat sink Prior to soldering it into place on the PCB sufficient insulation materials has to be applied In your kit you will find a black metal heat sink a rectangular slice of silicone rubber isolating and heat conductive and a black...

Page 18: ...ave the negative terminal marked with either a black line on the housing or a symbol Please take great care to mount these capacitors the correct way round Neglecting to do so will damage the capacitor and also possibly damage the PCB Now carefully mount these electrolytic capacitors C56 10 000µF 25V C58 100µF 25V C60 100µF 25V C61 100µF 25V C64 220µF 400V C65 47µF 400V C66 47µF 400V C67 100µF 63V...

Page 19: ...ght be difficult to obtain you will find a few spares supplied with the kit First solder both sockets into the printed side and then insert the fuses Z2 and Z3 Solder trimpot P3 2K5 2500 Ohm into the marked position and turn the indicator marked by a little arrow into the mid position using a small screwdriver the arrow is to point to the middle of the round section Now the power supply circuit bo...

Page 20: ...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 2 Cut and mount six wire jumpers displayed in yellow in figure 10 using the thin solid brown isolated wire supplied with the kit Please ensure that the isolation on these wires remains intact to prevent short circuits with the PCB tr...

Page 21: ...circuit them 3 Check the input selector switch by rotating it to confirm it has five positions tighten the central nut if necessary Next undo the two M3 screws on the input selector switch insert them into the two holes in the PCB together with the distance washers on top Now insert the switch terminals into the corresponding holes on the other side of the PCB and tighten the screws Please check v...

Page 22: ...ype of your Moving Coil cartridge The extensive description of the MC 10 transformer supplied with this construction manual will provide you with all information required to tune these step up transformers to your MC cartridge You will find details about resistor Rin and high frequency adjustment components Rc and Cc In figure 12 these parts are displayed to demonstrate their correct positions The...

Page 23: ...the parts 1 Mount the little solder terminals into the marked positions as described previously 2 Solder the Noval valve sockets into place Note do not bend the prongs of the Noval sockets over as this is not necessary to keep them in place If the sockets need replacing at a later date it will be almost impossible to do so once the prongs have been bent Bending also puts strain on the contacts ...

Page 24: ... end of this manual to find more information about this subject Solder these resistors into place R11 47k 47 000 ohm yellow violet orange tolerance band R12 470 ohm yellow violet brown tolerance band R13 1k2 1200 ohm brown red red tolerance band R14 1k2 1200 ohm brown red red tolerance band R15 1M 1 000 000 ohm brown black green tolerance band R16 180k 180 000 ohm brown grey yellow tolerance band ...

Page 25: ... easily C12 100nF 0 1µF µ1 100V C14 100nF 0 1µF µ1 100V C16 12nF 12n 400V C17 3 9nF 3n9 400V C20 100nF 0 1µF µ1 100V 2 Mount the little styroflex capacitors C18 C18 220pF little cyilindrical 3 Solder coupling capacitors C15 and C21 the yellow cylindrical ones into the marked positions pay attention to the correct orientation as indicated by the black line in figure 16 C15 0 22µF 400V C21 1µF 400V ...

Page 26: ...e marked however on the housing of the capacitors the terminal is marked Take extra care when mounting C13 in the right channel this is the only one in figure 17 which is orientated the other way round C11 220µF 25V C13 220µF 25V C19 220µF 25V C22 47µF 400V C24 47µF 400V The MD circuit board is finished now Please compare your PCB with figure 18 and check that all leads are cut off short PU MD 5 c...

Page 27: ...ll components 1 Mount and solder all twenty terminals into place as you have done before with the other circuit boards however take care when bending the pins of the six terminals drawn at the bottom left of figure 19 As these terminals are very close together don t bend the pins completely flat they are not to touch each other otherwise a short circuit will be caused 2 Solder the valve sockets in...

Page 28: ...y the colour codes below Mount the following resistors R31 560k 560 000 ohm green blue yellow tolerance band R32 2k2 2200 ohm red red red tolerance band R33 470 ohm yellow violet brown tolerance band R34 470 ohm yellow violet brown tolerance band R35 220k 220 000 ohm red red yellow tolerance band R36 100E 100 ohm brown black brown tolerance band ...

Page 29: ...black lines in figure 21 2 Insert and solder following MKH MKP capacitors C32 100nF 0 1µF µ1 100V C34 100nF 0 1µF µ1 100V C37 100nF 0 1µF µ1 250V 3 Mount coupling capacitors C35 the yellow cylindrical ones ensuring the correct orientation indicated by the black line and ring C35 1µF 400V 4 Mount the electrolytic capacitors paying attention to their polarity Pay special attention to C31 in the righ...

Page 30: ...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 cdr Copyright ir bureau Vanderveen oc tober 2003 Figure 22 ...

Page 31: ...1 First mount align and solder the terminals 2 Solder both 100k Ohm Watt resistors RvL and RvR into place colour coded brown black yellow tolerance band 3 Insert both Alps controls into place taking great care not to exchange them as the type numbers are almost identical The logarithmic volume control carries type number 100KAX2 whilst the balance control is a linear type with number 100KBX2 Solde...

Page 32: ...32 STEP 20 final assembly chassis mains input ground terminals power transformer mains switch E N L S1 EIND 1 cdr Copyright ir bureau Vanderveen october 2003 Figure 24 ...

Page 33: ... place By following these steps you ensure a good safety ground connection with the metal cabinet It is very important this is very carefully done 7 Mount two pieces of wire each 30cm long to terminal L 30cm of red wire and terminal N 30cm of black wire using the same techniques used with the E terminal first hook the lead in bend flat solder into place and apply 2cm of the 6mm wide heatshrink to ...

Page 34: ...rmer primary wires to terminals A1 and B4 of the power switch and the wires from the mains inlet to terminals A2 and B5 Before soldering first hook the wire into the little holes of the terminals and bend them over until they are flat After the solder joints have cooled down slide and shrink the pieces of heatshrink over the terminals 14 Now un mount switch S1 and place it aside as this is more co...

Page 35: ...STEP 21 mounting and wiring of the power supply and transistor T2 EIND 2a cdr Copyright ir bureau Vanderveen october 2003 Figure 25 1 Mount the power supply PCB as shown in figure 25 using four M3x5 screws ...

Page 36: ...olating bush isolating sheet transistor T 2 washer spring washer nut M3 sc rew M3x10 B C E 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 Carefully isolate these three solder connections using 2cm lengths of narrow heatshrink See figure 26 ...

Page 37: ...artition 6 The next step is very important you will need your ohmmeter 7 Test the conductivity between the earth tag next to the mains input and the middle terminal collector of transistor T2 The measured resistance has to be infinite If your meter shows any resistance transistor T2 has to be remounted with greater care This fault could be due to the mounting hole in the partition having a sharp e...

Page 38: ...250mA and the spare fuse Z1 into the fuseholder of the mains input terminal both will be accommodated Connect the supplied mains cord between the amplifier and a mains outlet 2 Switch on the power switch S1 The red LED must light up 3 Switch off S1 and wait for three minutes to discharge the power supply capacitors 4 Meanwhile study figure 27 This shows some important details for testing 5 Connect...

Page 39: ... core is rather oversized so even a DC component on the mains won t cause the transformer to hum Capture range of the power supply The 12 6V filament supply regulator is designed in such a way that it even functions correctly at a mains voltage as low as 180V or 90V when configured for 115V operation The concept behind this is that the amplifier should work in Japan with its 100V mains supply as w...

Page 40: ...6V Basically in this circuit the supply to IC1 is supplied by T1 and slowly increases with time The output voltage of the entire circuit increases proportionally until it is captured by IC1 and kept at constant level even if the supply voltage of IC1 rises to a higher level Filaments at 47VDC level relative to ground In the analogue signal part of the pre amplifier you will repeatedly find two val...

Page 41: ...er of check points are listed below If you establish a fault condition replace the part or check whether it is correctly mounted a 12 6V supply First check if there is 5V across resistor R52 relating to IC2 Check the slow increase in supply voltage at terminal 7 of IC1 concerning T1 Using an ohmmeter check that transistor T2 is correctly isolated measure between the collector of T2 and the heat si...

Page 42: ...42 STEP 22 final assembly mounting the audio PCB s E N L S 1 EIND 3A cdr Copyright Ir Bureau Vanderveen B V november 2004 Ground S crew M3 M3 M3 M3 M3 M3 M3 M3 M3 M3 Figure 28 ...

Page 43: ...e board 2 b Now fix in place with M3x5 screws Phono ground terminal 3 An M3 knurled thumbscrew is supplied with your kit Screw it into the GND terminal at the back of the chassis see figure 28 ground screw This screw is used to attach the ground lead of your record player Interconnection of the audio boards 4 Please refer to figure 28 You will notice ten short interconnecting wires between the aud...

Page 44: ...23 final assembly power supply headphone terminal E N L S 1 EIND 3B c dr Copyright Ir Bureau Vanderveen B V november 2004 M3 M3 M3 M3 M3 M3 M3 M3 M3 M3 Figure 29 Interconnection of power supply and audio boards ...

Page 45: ...he other terminals are situated at the rear of the socket and are numbered 1 8 Solder a 22cm length of blue wire to terminal 1 a 6cm length of blue wire to terminal 2 a 6cm length of red wire to terminal 8 and finally a 6cm length of the yellow wire to terminal 4 Since the solder terminals on the power circuit board will eventually be hidden under this headphone socket it is also more convenient t...

Page 46: ...of heatshrink over the shorter terminal of the LED and solder it to terminal 6 of the headphone socket Solder a length of wire between terminal 5 of this socket and the PCB terminal Example 2 The yellow LED can be powered by the high voltage supply connected in series with a 150V Zener diode and a 10 000 Ohm resistor The brightness will gradually increase in approx 15 seconds after the power is sw...

Page 47: ...47 STEP 24 final assembly leads for audio signal path E N L S 1 EIND 3C c dr Copyright Ir Bureau Vanderveen B V november 2004 M3 M3 M3 M3 M3 M3 M3 M3 M3 M3 Figure 32 ...

Page 48: ...splayed for the sake of clarity Red is used for the right channel yellow for the left and black for the ground leads It might be convenient to mark both ends of each lead with a felt tip pen to avoid having to check each connection with an ohmmeter prior to soldering 4 Start with three 13cm lengths for soldering between the control circuit board just behind the volume pot and the line PCB Slide on...

Page 49: ... Slide the white nylon washer over the extension shaft and push on one of the two small knobs 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 S1 Front Knob Shaft coupling extension shaft nylon washer montage keuze as cdr Figure 33 3 P...

Page 50: ... 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: ...al 10 Now connect a power amplifier and a CD player or any other source to the appropriate input of the amplifier and check that all controls function correctly 11 Also plug a headphone in and check that it functions correctly Please note the following advice Connect the headphone after the amplifier has been switched off for a couple of minutes and also disconnect the headphone again before you s...

Page 52: ...0 Ohm wire jumper MD CIRCUIT when valve B2 12AT7EH ECC81 and B3 12AU7A ECC82 Electro Harmonix Ao 28 x 1 kHz Cin 170 pF exclusive influence of PCB Zout 13 5 kOhm B2output Zout 3 8 kOhm B3output Vin nom 4 8 mVrms 1 kHz Vin max 88 mVrms 20 Hz 45 dB headroom Vin max 707 mVrms 1 kHz 43 dB headroom Vin max 707 mVrms 20 kHz 23 dB headroom R16 150 kOhm R17 18 kOhm MD CIRCUIT when valve B2 12AT7EH ECC81 an...

Page 53: ...utput impedance of valve B2 This way the RIAA curve will be followed accurately Experiment 3 Tuning the MD pick up cartridge MD cartridges are very sensitive for an optimal electrical load at the input of the MD pre amplifier see R11 and C10 I noticed that omitting C10 usually 100pF resulted in an obvious improvement in spatial reproduction in the case of my own cartridge Experimenting with the va...

Page 54: ...rinted with kind permission of Hans van Maanen only available in Dutch language 4 H R E van Maanen Signaalprocessor voor magneto dynamische pick up elementen Radio Elektronica 1980 19 Reprinted with kind permission of Hans van Maanen only available in Dutch language LITERATURE The amount of literature that I consulted is immense a study that took my entire life and still continues It makes no sens...

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