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Grounded Grid wiring question
Grounded Grid wiring question
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Old 15th October 2004, 07:28 AM   #1
ultrachrome is offline ultrachrome  United States
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Default Grounded Grid wiring question

I'm finally wiring up my Grounded Grid preamp after much delay. Partly due to me deciding to hand wound a toroid to power it.

I have some MIL-W-16878 stranded 22 gauge wire. Is this sufficient to provide 12V 1A DC (from LM340T) to heat three 12AU7A's or should I use something thicker? The tubes will be daisy-chained.

Thanks.
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Old 15th October 2004, 10:11 AM   #2
Bas Horneman is offline Bas Horneman  Netherlands
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You need something slightly thicker..or you can double up ofcourse

22 awg max current is 0.92A

http://www.powerstream.com/Wire_Size.htm
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Old 15th October 2004, 05:25 PM   #3
ultrachrome is offline ultrachrome  United States
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Thanks, I saw that link in another thread but I don't understand the difference between "amps for chassis wiring" and "amps for power transmission".
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Old 17th October 2004, 03:56 AM   #4
cogsncogs is offline cogsncogs  United States
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Use 20 awg solid Rat Shack hookup wire, should do just fine!

Wayne
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Old 17th October 2004, 03:36 PM   #5
Sherman is offline Sherman  United States
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Quote:
Originally posted by ultrachrome
Thanks, I saw that link in another thread but I don't understand the difference between "amps for chassis wiring" and "amps for power transmission".

Chassis wiring = short runs between components in the chassis.

Power transmission = running power over distances (say between an external PSU and amp chassis).

I would think that running wire from an internal PSU to a heater pin on a tube would qualify as chassis wiring if the distance is relatively short like a couple inches.

However, if in doubt 20AWG is cheap and available anywhere.
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