HP Aikido Stereo 9-Pin PCB - Manual (Page 10)

GlassWare Audio Design 9
Assembly
Before soldering, be sure to clean both sides of the PCB with 90% isopropyl alcohol,
wiping away all fingerprints. First, solder the shortest parts (usually the resistors) in
place, then the next tallest parts, and then the next tallest... Make sure that both the
solder and the part leads are shiny and not dull gray. Steel wool can restore luster and
sheen by rubbing off oxidation. If some of the parts have gold-plated leads, remove
the gold flash before soldering the part, as only a few molecules of gold will poison a
solder joint, making it brittle; use sandpaper, steel wool, or a solder pot. NASA forbids
any gold-contaminated solder joints; you should as well. (Yes, there are many quality
parts with gold-flashed leads, but the use of gold is a marketing gimmick.)
Normally, such as when the PCB sits on the floor of its chassis, all the parts sit on the
top side of the PCB (the top side is marked). If you wish to have the tubes protrude
from holes on the top of the chassis (and to place the PCB within 1" of the top panel
with the aid of standoffs), then all the other parts— ex cept the tube sockets— can be
placed on the PCB’s backside; it is a double-sided board after all (be sure to observe
the electrolytic capacitors' polarity and glue or tie-wrap heavy coupling capacitors to
the PCB).
Let me know what you think
If you would like to see some new audio PCB or kit or recommend a change to an
existing product or if you need help figuring out the heater jumper settings or cathode
resistor values, drop me a line by e-mail to the address above (begin the subject line
with either “Aikido” or “tube”).
B+ Voltage =
Heater Voltage =
R1,5,6,7,12,13 =
R2,4 =
R3,9,10 =
R8,11 =
R15 =
R16 =
6CG7 & 6DJ8 6CG7 & 6CG7 12AU7 & 6H30
170V - 250V (250V) 200V - 300V (300V) 200V - 300V (150V)
6.3V or 12.6V 6.3V or 12.6V 12.6V
1M 1M 1M
270 - 1k (640 5mA)* 470 - 2k (640 5mA)* 470 - 2k (741 3mA)*
100 - 1k (300)* 100 - 1k (300)* 100 - 1k (300)*
200 - 330 (291 10mA)*
200 - 470 (240 10mA)* 200 - 470 (74 30mA)*
87.3k 83.2k 76.5k
100k 100k
1 00k
C1 =
C2 =
C3 =
C5 =
C6 =
C7,8,9,10 =
C11,12 =
47µF* Film for 300-ohm HP Same Same
470µF* for 32-ohm HP Not recommended 470µF* for 32-ohm HP
0.47µF* Film or oil Same Same
10 - 1kµF, 10V Electrolytic "10 - 1kµF, 16V Electrolytic
1 - 10µF* "
"
0.047µF - 1µF* Film or oil " "
10µF-1kµF, 16V Electrolytic " Same
0.1µF 160V(optional) " None
*voltage rating must equal or exceed B+ voltage
(input) V2, V3 =
(output) V1, V4 =
6CG7, 6FQ7 6CG7, 6FQ7 12AU7, 5814, 5963,
6189, ECC82
6DJ8, 6922, 6CG7, 6FQ7 6H30
7308, ECC88
*High-quality resistors essential in this position
All resistors 1/2W or higher
Typical Part Values
() Parentheses denote recommended values