Vanderveen MCML05 User manual

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

2
GENERAL INFORMATION
COPYRIGHT
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. buro Vanderveen.
SUPPLIER
Amplimo b.v. is the official supplier of this kit in Europe. Amplimo b.v. also handles all contacts with the
customers and users of the kit.
CONSTUCTION MANUAL
This manual is not available in bookshops; it is only available with the MCML05 construction kit.
SERVICE
Service from Amplimo b.v. consists of two elements:
a) Answering of questions by telephone, fax or email.
b) Checking and adjustment of the buyer’s constructed amplifier for a charge of € 150 incl. VAT but excl.
shipping charges. Please ensure that the amplifier is well packed before sending it to: AMPLIMO b.v.;
Industrieweg 14; NL-7161 BX NEEDE, The Netherlands.
After inspection and repair, the amplifier will be returned, cash on delivery (shipping charges plus € 150.00)
or after a prepayment. Shipping is at the risk of the customer. Inspection and repair will take a maximum
of two weeks. The customer will be notified if it takes longer.
GUARANTEE
1) Guarantee conditions and terms of delivery are defined in the “Algemene Voorwaarden voor de
Instrumentenbranche”.
2) The guarantee period is a total of 6 months from the date of purchase, (see below).
3) All elements 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. For instance: by shortening the
leads of the transformer (which you shouldn’t do) or damage due to incorrect positioning of a valve in its
socket. Because we are dealing with a DIY construction kit, damage is possible if the construction guidelines
are not followed in full. The guarantee does not cover damage if it is due to faulty construction.
TERMS OF DELIVERY
1) The MCML05 amplifier is only sold as a complete construction kit, inclusive of the construction manual.
2) Individual components for the kit will only be supplied for the replacement of defective or incorrectly
supplied parts, to the original owners of the kit.
3) Delivery will only take place after the purchase price has been paid in cash, in advance into the
international bank account of Amplimo b.v. (IBAN NL 36 RABO 031311250), by cash on delivery or by
payment using VISA or MasterCard. If you want to personally collect the construction kit please contact
Amplimo b.v. first.
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.
6) In addition to the above, the General Terms of Delivery for the “Instrumentenbranche of the FHI” are
applicable

3
SAFETY INSTRUCTIONS
1) This construction kit employs high voltages (220/230 Volt 50 Hz AC and 200 Volt DC). These voltages
are potentially lethal if they come in contact with the human body. This is why you must take the
greatest care to avoid accidents or damage of any kind.
2) Only work on the opened amplifier cabinet after the mains plug has been removed from the mains
socket AND after the amplifier’s high voltage supply has been discharged by first switching the amplifier
to the off mode for several minutes.
3) Never work with both hands placed in the amplifier at the same time when it is switched on, or when
there is still a high voltage present in the set. This situation is extremely dangerous, as leakage or
discharge currents may flow from hand to hand via the heart.
4) Only use the prescribed fuses.
5) Take care to ensure that all high voltage leads are insulated and positioned far away from metal parts.
6) DO NOT SHORTEN THE LEADS OF THE TRANSFORMER as this can cause irreparable damage to
the transformers.
7) Do not insert conductive objects into the cabinet.
8) Thoroughly check that the electrolytic capacitors are mounted as instructed, take care not confuse the
negative pole with the positive pole, as this could cause acid to leak or for the capacitor to explode.
9) Thoroughly check that transformer leads are connected to the PCB and other parts in accordance with
their prescribed colour scheme.
10) Ensure that valve sockets are mounted the right way round in accordance with the diagram.
11) When switching on for the first time explicitly follow the “test procedure” given for the completed set.
12) On the following pages you 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 disconnect the set from the mains supply and send the amplifier to Amplimo to be checked.
Also note that the cover located above the valves will become warm. Take care at all times to prevent
the cover from being touched (paying special attention to children). Again with children in mind, position
the amplifier so that it becomes impossible to poke metal objects into the cabinet.
14) This amplifier has to be earthed – ensure that the mains socket has an earth connection.
15) With soldered joints, hook the wire in place to form a mechanically stable joint before soldering. This
ensures that the wire cannot become loose to cause potential damage or to become a hazard. A piece
of heatshrink sleeving around this type of joint not only prevents you from touching the bare terminal,
but is also gives extra protection against the contact from working loose.
16) Where two or more wires are soldered in close proximity to each other on the PCB or for instance on
the volume control, they have to be secured in place by the use of a cable tie. This prevents the wires
from drifting around in the cabinet if they accidentally become unsoldered.
Amplimo b.v.
Industrieweg 14
NL-7161 BX NEEDE
The Netherlands
Tel: [phone]
Fax: [phone]
Email: [email protected]
Internet: www.amplimo.nl
Ir. Bureau Vanderveen b.v.
Sassenstraat 21
NL-8011 PA ZWOLLE
The Netherlands
Email: [e-mail]
For possible future modifications:
www.mennovanderveen.nl

4
EG verklaring

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. Some of the details are outlined below:
While designing this pre-amplifier it soon became clear that a really good pre-
amplifier has to meet very high demands. The absence of noise and hum are well known
conditions. These have been met, together with a vast frequency range and low distortion.
It was much harder though to correctly reproduce the “emotions” which are
apparent in good music recordings. Reproduction of these emotions in particular requires
a first-rate design and high quality components. It took several years of testing to ensure
that this design and the choice of components could guarantee faithful reproduction of
these emotions under all circumstances. The key prerequisite of these extensive tests had
to be the evaluation of our ability to hear. “Do we experience the same sound quality as
we will tomorrow, or is the sound quality equal to yesterdays sound quality”? We are
convinced that this pre-amplifier, provided has been built carefully, will meet these high
demands.
One of the new features concerns the power 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 the front panel to satisfy headphone
users.
In addition to the usual line inputs this pre-amplifier also offers RIAA corrected
inputs for moving magnet and moving coil pick up cartridges.
This pre amplifier consists of several modules: the line amplifier, the phono pre-amp
(with passive RIAA correction), the MC pre-stage (supplied with Vanderveen
MC-10 step up transformers) and the power supply. These are built on separate PCB’s,
providing the opportunity to exchange each of these modules with one of alternative
design. Whether these alternative modules are your own or designed by us doesn’t matter,
the modular design of the pre-amplifier enables you to easily modify it. Just exchange a
single PCB. Please visit the Vanderveen website for available updates and modifications.
We hope that you will get lot of pleasure from building this MCLM05 valve pre-
amplifier together with a greater joy in listening to your favourite music using this pre-
amplifier. Should you have any questions, please contact our customer support
department.
Ir. bureau Vanderveen b.v. Amplimo b.v.
ir. Menno van der Veen Hans Braam and Henk te Selle
Nederland, november 2007 Neede, november 2007

6
P1
P2
ALPS
470
1k2
1k2
470
1k2
1k2
R3 3
R1 3
R1 9
R3 4
R1 4
R2 0
C33
C11 C13
C19
C31
C34
C32
C12 C20
C14
220
220 220
220
220
25
25 25
25
25
V
V V
V
V
100
100
100 100
100
nF
nF
nF nF
nF
100V
100V
100V 100V
100V
u
u u
u
u
F
F F
F
F
VDV-VV Version 6; 22-12-2005
Design: Menno van der Veen C:\vdv-vv\vd v-vv.c d r
Copyright: ir.bureau Vanderveen
27k
220k
220k
R3 5
R2 1
R3 1
R1 1 *
560k
47k
R3 2
R1 2
2k2
470E
C35
C15
1uF 200V
200V
MC-input
MD-input
R1 5
180k
R16*
C16
12 nF
100V
1M
R17*
LIN E- i n
MC
MC
MD
MD
CD DVD
RA D I O
REC - o u t
Output
REC - i n
LINE
100k-BX2
100k C18
C17
220 pF
3,9 nF
S-3
S-2
ECC82EH / 12AU7A
EC C 8 1
EC C 8 2
B4
B3
B2
LINE- o u t
220 nF
1uF
200V
C21
R1 8
C10*
0,35 mV
Re
100E
1k1k
47 uF
47 uF47 uF
250V
250V250V
100nF
100nF100nF
200V
200V200V
V- 0
V- 1
V- 1
C36
C24C22
C37
C25C23
R3 6
R2 3
R2 2
V- 2
Switch "Sh" in HPh-socket
activatesthe Re-coil
when HPh isplugged into the socket
R4 1
1k
El e c t r o Ha r m o n i x
197V187V
99V
1,9V
1
Re - c o i l
HP-in-
Re - p
Re - m
D1
1N4148
100k-BA2
LINE- o u t
V
LI NE- i n
v
ALPS
MD-OUTPUT
R11 , C10 , R16 , R17 : see manua l
gnd-in-mc
Tr2
Rc
Cc
MC-output
0 E
Rin
Rv L- Rv R

7
S1a
S1a
S1b
S1b
115 V
115 V
115V
115V
200V
Z1 25 0 mA
Z1 50 0 mA
Z1' 25 0 mA
Z1' 50 0 mA
I²t >= 4
I²t >= 4
I² t > = 0. 5
I² t > = 0. 5
CONNECTOR
CONNECTOR
IE C MA INS-
IEC MAINS-
C HASS IS
CH ASS IS
GROUND
GROUND
Power Switch Sh
16 V 2 A
50mA
dg
s
VDV-VOED Version 6: 22-12-2005
C:\vdv-vv\vdv-voed.cdr
C54
C55
D5-8 =
BY 55 0- 10 0
C54-55 = 100nF/100V
C56
10 .0 00 uF/2 5V
LE D
C58
10 0u F
10 0u F
10 0u F
16 V
16 V
C60 C61
R54 R55
1 k
1 k
R56
R57
C62
C63
D10-13 1N4007 C64
22 0u F
38 5V
D14
D15
Z100V
Z100V
R61
R62
22 0k
47 k
C65
47 u F
25 0V
C66
47 uF 10 0u F
25 0V 63 V
R58
1k5
Design: Menno van der Veen
Copyright: ir.bureau Vanderveen
D9
Tr-1
15 0k
47 k
12 ,6 V
BC5 47
47 k
10 0n F
1k
TL071
+
-
3 24
7
6
1n F
BDX3 3C
2k5
15 k
10 k
in
ou t
gn d
24 V 50 mA
C57
25 V10 0V
C59
10 V
c
b
e
T1
T2
BUZ80
T3
10 0k
1W
Gekoeld op vin
47 V
P3
C67
R63
R64
R65
C68
C69
C68-69 = 100nF 100V
C70
C71
47 0 uF
47 0 uF
25 V
25 V
+ 14V
- 14V
10 0
R60
DCEL-16
IC2
IC1
R52
R53
BRN
BRN
WHT
WHT
BLK
BLK
PNK
PNK
BLU
GRY
RED
YE L
GRN
ORA
78 05
A
B
Z2
16 0 mA T
C
D
Z3
16 0 mA T
E
F
+
-
~ ~
Rd
La
Lc
1W
FFp FFm
53 ,3 V
40 ,7 V
Vo
Go =
19 7V
0 V
19 7V
V
V
10 n F 10 n F
12 00 V 12 00 V
-12
IC3b IC3a
22 0k
22 0k
10 0k
10 0k
10 pF 10 pF
+12V
-12V
8
7
6
5
4
1
2
3
-
+
+
-
HP-out-L
HP-out-R
HP-out-gnd
HP-in-L HP-in-gnd
HP-in-R
WIRINGPRIMARY FOR 200 -250 Vac
WIRINGPRIMARY FOR 90- 130 Vac
24 V
V
V
IC 3 = T L 07 2
+12V
-12V
on
of f
x
x
resistors (x): see manual
6, 3 m m Head ph on e S oc ket . Isolated from chassis. Sh-switch @ "on" when headphone is plugged in.
Sh
1
1
Re-p
Re-m
7805-C
in gnd out
BDX33C
bc e
BUZ80
dgs
BC547
cbe
b
e
c
1
2
3
45
6
7
8
TL071 TL072
top
view
1
D9
La
Lc
R80
R81
R82
R83
Rx
Rx
C81
C90
10 0n F
10 0n F
C91
C82
D17
T
start = 15 s
T
start = 35 s
Z12V
10 k
R66
R67
R68
10 k
10 k

8
LIST OF COMPONENTS
Resistors
CODE VALUE TYPE QUANTITY MARKING
R11 47kΩ½ Watt carbon film 2 yellow-violet-orange-gold
R12 470Ω½ Watt carbon film 2 yellow-violet-brown-gold
R13 1K2Ω½ Watt carbon film 2 brown-red-red-gold
R14 1K2Ω½ Watt carbon film 2 brown-red-red-gold
R15 1MΩ½ Watt carbon film 2 brown-black-green-gold
R16 180KΩ½ Watt carbon film 2 brown-grey-yellow-gold
R17 0Ω2 refer to text
R18 27KΩ½ Watt carbon film 2 red-violet-orange-gold
R19 1K2Ω½ Watt carbon film 2 brown-red-red-gold
R20 1K2Ω½ Watt carbon film 2 brown-red-red-gold
R21 220KΩ½ Watt carbon film 2 red-red-yellow-gold
R22 1KΩ½ Watt carbon film 2 brown-black-red-gold
R23 1KΩ½ Watt carbon film 2 brown-black-red-gold
R31 560KΩ½ Watt carbon film 2 green-blue-orange-gold
R32 2K2Ω½ Watt carbon film 2 red-red-red-gold
R33 470Ω½ Watt carbon film 2 yellow-violet-brown-gold
R34 470Ω½ Watt carbon film 2 yellow-violet-brown-gold
R35 220KΩ½ Watt carbon film 2 red-red-yellow-gold
R36 100Ω½ Watt carbon film 2 brown-black-brown-gold
R41 1KΩ½ Watt carbon film 2 brown-black-red-gold
RvL 100KΩ½ Watt carbon film 1 brown-black-yellow-gold
RvR 100KΩ½ Watt carbon film 1 brown-black-yellow-gold
R52 1KΩ½ Watt carbon film 1 brown-black-red-gold
R53 47KΩ½ Watt carbon film 1 yellow-violet-orange-gold
R54 15KΩ½ Watt carbon film 1 brown-green-orange-gold
R55 10KΩ½ Watt carbon film 1 brown-black-orange-gold
R56 1KΩ½ Watt carbon film 1 brown-black-red-gold
R57 1KΩ½ Watt carbon film 1 brown-black-red-gold
R58 1K5Ω½ Watt carbon film 1 brown-green-red-gold
R60 100Ω1 Watt metal film 1 brown-black-black-black-brown
R61 100KΩ1 Watt metal film 1 brown-black-black-orange-brown
R62 47KΩ½ Watt carbon film 1 gellow-violet-orange-gold
R63 220KΩ½ Watt carbon film 1 red-red-yellow-gold
R64 10KΩ½ Watt carbon film 1 brown-black-orange-gold
R65 150KΩ½ Watt carbon film 1 brown-green-yellow-gold
R66 47KΩ½ Watt carbon film 1 yellow-violet-orange-gold
R67 10KΩ½ Watt carbon film 1 brown-black-orange-gold
R68 10KΩ½ Watt carbon film 1 brown-black-orange-gold
R80 100KΩ½ Watt carbon film 1 brown-black-yellow-gold
R81 220KΩ½ Watt carbon film 1 red-red-yellow-gold
R82 100KΩ½ Watt carbon film 1 brown-black-yellow-gold
R83 220KΩ½ Watt carbon film 1 red-red-yellow-gold
R-led yellow 10KΩ½ Watt carbon film 1 brown-black-orange-gold
R-led yellow 3K3Ω½ Watt carbon film 1 orange-orange-red-gold
Potentiometers
CODE VALUE TYPE QUANTITY MARKING
P1 100kΩlog stereo volume control ALPS 1 100KAX2
P2 100kΩlin stereo balance control ALPS 1 100KBX2
P3 2k5Ωtrimpot small horiz 1 2K5

9
Capacitors
CODE VALUE TYPE QUANTITY MARKING
C11 220µF / 25V electrolytic cap radial 2 220u 25V
C12 100nF / 100V capacitor radial MKT 2 u1 K100
C13 220µF / 25V electrolytic cap radial 2 220u 25V
C14 100nF / 100V capacitor radial MKT 2 u1 K100
C15 220nF / 200V capacitor axial MKT 2 0.22uF 400V
C16 12nF/100V capacitor radial MKT 2 12n 400
C17 3,9nF capacitor radial MKT 2 3n9 400
C18 220pF/160V capacitor axial polystyrene 2 220
C19 220µF / 25V electrolytic cap radial 2 220u 25V
C20 100nF / 100V capacitor radial MKT 2 u1 K100
C21 1µF / 200V capacitor axial MKT 2 1uF 400V
C22 47µF / 250V electrolytic cap radial 2 47u 400V
C23 100nF/200V capacitor radial MKP 2 u1 K250
C24 47µF / 250V electrolytic cap radial 2 47u 400V
C25 100nF/200V capacitor radial MKP 2 u1 K250
C31 220µF / 25V electrolytic cap radial 2 220u 25V
C32 100nF / 100V capacitor radial MKT 2 u1 K100
C33 220µF / 25V electrolytic cap radial 2 220u 25V
C34 100nF / 100V capacitor radial MKT 2 u1 K100
C35 1µF / 200V capacitor axial MKT 2 1uF 400V
C36 47µF / 250V electrolytic cap radial 2 47u 400V
C37 100nF/200V capacitor radial MKP 2 u1 K250
C54 100nF / 100V capacitor radial MKT 1 u1 K100
C55 100nF / 100V capacitor radial MKT 1 u1 K100
C56 10.000µF/25V electrolytic cap radial 1 10000uF 25V
C57 100nF / 100V capacitor radial MKT 1 u1 K100
C58 100µF/25V 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 radial 1 47u 400V
C67 100µF/63V electrolytic cap radial 1 100u 63V
C68 100nF / 100V capacitor radial MKT 1 u1 K100
C69 100nF / 100V capacitor radial MKT 1 u1 K100
C70 470µF/25V electrolytic cap radial 1 470u 25V
C71 470µF/25V electrolytic cap radial 1 470u 25V
C81 10pF capacitor radial ceramic 1 100J
C82 10pF capacitor radial ceramic 1 100J
C90 100nF/50V capacitor radial polyester 1 0.1 63
C91 100nF/50V capacitor radial polyester 1 0.1 63
V
alves
B2 ECC82/12AU7 double triode Electro Harmonix 2
B4 ECC82/12AU7 double triode Electro Harmonix 2
B3 ECC81/12AT7 double triode Electro Harmonix 2
Semiconductors
CODE DESCRIPTION TYPE QUANTITY PRINTING
D1 diode 1N4148 1 1N4148
D5 - 8 diode BY550-100 4 BY550
D9 led red 1
D10 - 13 diode 1N4007 4 1N4007
D14 Zener diode 100V 1 100
D15 Zener diode 100V 1 100
DCEL16 bridge rectifier 1 AM154
D17 Zener diode 12V 1 12
D LED yellow see text 1
D Zener diode 150V see text 1 150
T1 transistor BC547B 1 C547B
T2 transistor BDX33C darlington 1 BDX33C
T3 transistor BUZ80A mosfet 1 04N80C3
IC1 IC TL071 op-amp 1 TL071
IC2 IC 7805 Voltage regulator 1 L78M05

10
IC3 IC TL072 op-amp 1 TL072
Other items
Cabinet lower part zincor black 1
Cabinet upper part zincor black 1
Front Front panel plastic grey 1 MCML05
Knob knob black aluminium 1 50mm diam.
Knob knob black aluminium 2 17mm diam.
S-1 (a+b) switch toggle mains 1
S-2 switch toggle MM/MC 1
S-3 switch 5 way selector 1
Input headphone switched 1
Input mains with fuseholder 1
Input 2x stereo input cinch gold plated 4
Tr1 transformer Amplimo mains 1 2N1424
Tr2 transformer Vanderveen MC 2 MC10
PCB set of 5 Vanderveen 1
Valve socket noval pcb mount gold plated 6
Re relay headphone 1 Omron
IC socket for IC1, IC3 DIL 8 2
Fuseholder for Z2, Z3 TR5 pcb mount 2
Z1,Z1’ time lag fuse IEC127 5x20mm glass 2 T0,25A I²t min.0,5
Z2, Z3 time lag fuse TR5 plug in 5 T0,16A
Shaft for S-3 217mm extension shaft 1
Shaft support shaft support 6mm 1
Shaft coupling for extension shaft 2
Bush nylon 7,5mm spacer for selector knob 1
Grommet wire conduct 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 for feet and cover
M4x12mm screw pan head black hex socket 4 for front panel
ST2,9x13mm screw pan head black 4 for cinch inputs
M3 nut nut zinc plated 2 for mains input
M3 washer spring washer 3 for mains input
M3 washer washer nylon white 2 for input pcb
M5x60mm screw pan head zinc plated 1 for mains transformer
M5 nut zinc plated 2 for mains transformer
M5 washer zinc plated 2 for mains transformer
Metal washer dished washer 70mm zinc plated 2 for mains transformer
Rubber washer washer 70mm neoprene 2 for mains transformer
Solder solder with silver SILTECH 45 grams
Wire wire several colors 1 set
Wire silver wire 0.5mm diam SILTECH 3 meter
Heat shrink 3 diameters 1 set
Cable ties Cable ties 80 mm black 20 pcs

11
CONSTRUCTION - general hints -
MOUNTING COMPONENTS ON THE PCB
Some examples for the mounting of axial components (= longitudinal leads) are drawn above.
Determine length “L” for these components by measuring the distance between the holes in the
circuit board. Then bend the leads to the right size using a pair of pliers. The components will then
fit neatly into the holes of the circuit board. To prevent the part from falling out when turning the
PCB upside down, you can bend the leads slightly outwards.
SOLDERING
A good soldering technique is important for long term reliability and the correct functioning of the
set.
Bad solder connections (“dry joints”) are the main cause of poor electrical contact. These can work
loose after several cycles of warming up and cooling down.
Note the following:
1. Use a good soldering iron rated at a medium 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 joint: a good joint is shiny, a bad one is dull.
7. Cut the leads close to the soldered joint to ensure that there are no long protruding leads.
Corona discharge from sharp points at high voltage can be prevented in this way.
8. Experts recommend against cutting the leads after soldering as this might deform the joint
causing bad contacts after a period of time. However cutting before soldering is not always
possible, therefore trim the lead back after soldering, and to guarantee good connections you
can reheat each joint with the soldering iron.
jumper
¼ W resistor
5W resistor
Approx. 5mm from pcb
Amount of solder Good Too little Too much

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.
The 1 Watt metal film resistors are clearly recognizable by their pale blue colour and they are
larger than the ½ Watt carbon film resistors.
COLOUR-CODE-INDEX 1 for ½ 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 BAND 3 BAND 4
black bl 0 0 0 x 1
brown br 1 1 1 x 10
red rd 2 2 2 x 100
orange or 3 3 3 x 1K
yellow ye 4 4 4 x 10K
green grn 5 5 5 x 100K
blue bl 6 6 6 x 1M
violet vi 7 7 7 x 10M
grey gry 8 8 8
white wt 9 9 9
gold gld x 0.1
silver sil x 0.01
TOLERANCES: brown 1%, red 2%, gold 5%
EXAMPLE: yellow – violet – black – red - brown = 47kΩ / 1%

13
STEP 1 – power supply circuit board -
solder terminals
VOED-1.cdr Copyright ir.bureau Vanderveen october 2003
Figure 1
1. One can recognize this circuit board by the text: "VDV-6, COPYRIGHT VANDERVEEN". The
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). 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 method provides a strong connection as well as preventing corona discharge
from the PCB to the metal cabinet.

14
STEP 2 – power supply circuit board –
diodes
VOED-2.cdr Copyright ir.bureau Vanderveen october 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
lines, the diode itself has a ring marking the cathode, (depending on the type of diode this ring
can either be white, grey or black) please take great care to mount the diodes the correct way!
NOTE THAT the components that have already been mounted are coloured turquoise in figure 2,
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.
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 carefully; the type number of these diodes
contains the number 100).
4: Diode D17 also is a Zener-diode, in this case for 12VDC regulation; again mount this close to
the board, (the type number of this diode contains the number 12, please check very carefully,
as it looks very much like another diode, type 1N4148 which also comes with this kit !).
5: The part called DCEL-16, is a bridge rectifier, it contains four diodes. This part will fit in four
different ways on the PCB, please observe the “+” marking on the housing and mount it the
correct way.
6. Solder all in place and crop the leads.

15
STEP 3 - power supply circuit board –
resistors
VOED-3.cdr Copyright ir.bureau Vanderveen october 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).
R52 1k = 1000 ohm brown black red +tolerance band
R53 47k = 47000 ohm yellow violet orange +tolerance band
R54 15k = 15000 ohm brown green orange +tolerance band
R55 10k = 10000 ohm brown black orange +tolerance band
R56 1k = 1000 ohm brown black red +tolerance band
R57 1k = 1000 ohm brown black 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
R66 47k = 47000 ohm yellow violet orange +tolerance band
R67 10k = 10000 ohm brown black orange +tolerance band
R68 10k = 10000 ohm brown black orange +tolerance band
R80 100k = 100000 ohm brown black yellow +tolerance band
R81 220k = 220000 ohm red red yellow +tolerance band
R82 100k = 100000 ohm brown black yellow +tolerance band
R83 220k = 220000 ohm red red yellow +tolerance band

16
STEP 4 – power supply circuit board –
small capacitors
VOED-4.cdr Copyright ir.bureau Vanderveen october 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.
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

17
STEP 5 - power supply circuit board –
transistors and integrated circuits
VOED-5.cdr Copyright ir.bureau Vanderveen oc tober 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. The correct orientation for part IC-1 is indicated by either a
notch or a shiny dot; now carefully push the IC into its socket, its orientation corresponding
with the socket.
3: IC-3 has type number TL072 it also comes with a socket. Please proceed as with IC-1.
4: IC2 is a type L78M05, this only has three leads. Mount it upright after bending 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 plastic bush/washer;
please study figure 6 carefully. This shows how to mount this transistor with an M3 screw,
washer and nut whilst ensuring that the metal back of the transistor remains electrically
isolated from the heat-sink. Bend the middle lead of the transistor a little forward and solder
into the PCB, taking care that the distance of the heat-sink to the PCB is approx 6mm and
the heat-sink is not in contact with the surrounding components.
1
2
3
4
5
6
1: SPP04N80C3
2: Heatsink
3: Isolating sheet
4: Black bush
5: M3x10 screw
6: M3 Washer
7: Spring washer
8: M3 nut
Figure 6

18
STEP 6 & 7 – power supply circuit
board - electrolytic capacitors
VOED-6.cdr Copyright ir.bureau Vanderveen october 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.
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
C70 470µF 25V
C71 470µF 25V

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.
Both Z2 and Z3 have the same value (T160mA) which is printed on the top. Because these
fuses might 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 board is complete, and should appear as shown in figure 9.
Check that all leads are cut off short, a maximum length of 3mm is allowed for.
VOED-9.cdr Copyright ir.bureau Vand erveen oc tob er 2003
Figure 9

20
STEP 9 – input circuit board –
solder terminals
& wire jumpers
IN-1.c dr Cop yright ir. burea u Vand erveen oc tob er 2003
Figure 10
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.
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 tracks underneath.