HP 9-Pin User Manual download pdf (Page 10)

GlassWare Audio Design

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 su

re 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 wit

hin 1" of the top panel

with the aid of standoffs), then all the other parts

— except 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 he

avy 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 100k

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

1 2 ... 5 6 7 8 9 10 11 12 13

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HP 9-Pin User Manual Page 10

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