Grounded Grid wiring question

[ultrachrome]

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.

 

[Bas Horneman]

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

 

[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".

 

[cogsncogs]

Use 20 awg solid Rat Shack hookup wire, should do just fine!

Wayne 😉

 

[Sherman]

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.