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Amp Wiring Color Code
Amp Wiring Color Code
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Old 23rd October 2007, 07:07 AM   #1
gingertube is offline gingertube  Australia
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Default Amp Wiring Color Code

I am about to start wiring a new tube amp and did a search for "standard" wire color (or colour for us down under) codes. When I was an apprentice there was a very strict "correct" wire colour to be used for each tube pin and heaven help anyone who used the wrong colour to connect a grid or a screen or cathode or whatever. Of-course that was back in the day when Apprentice Masters indicated your mistakes/faults with a smack in the head.

I found this:

For the possible benefit of others I posted the link. It does make set to work and fault finding easier.

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Old 23rd October 2007, 12:07 PM   #2
Sherman is offline Sherman  United States
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I agree that using consistent color coding makes thing much easier. Not just during trouble-shooting or later repairs/upgrades but for me at least it also helps during construction. Things like signal wires running too close or parallel to high current AC really stand out.
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Old 31st December 2008, 04:51 PM   #3
Ben10 is offline Ben10  United Kingdom
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Excellent. Just what I was looking for.

I was trying to figure out how many different colors to purchase. 3-4-5-6?

I know this is an old thread but thanks for the post.
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Old 31st December 2008, 05:16 PM   #4
Hi_Q is offline Hi_Q  England
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When I was a teen I joined the Royal Navy where I was taught the following::-
Red - HT Wiring (B+)
Orange - Screen grid
Green - Signal Grid
Brown - Heaters
Black - Earth or chassis.

Any other odd wiring like to cathodes was Pink.

White was reserved for very high voltage or EHT wiring.

Blue was reserved for negative voltage supplies.

Not too far from the list previously given but I don't think the colour rules were ever 'hard and fast' and there were slight variations.
Surprisingly, I have serviced many old valve amplifiers since and many conformed to the above standard, specifically the brown heater wiring.
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Old 31st December 2008, 06:44 PM   #5
Cobra2 is offline Cobra2  Norway
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Amp Wiring Color Code Amp Wiring Color Code

Arne K
Don't believe everything you think...
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Old 31st December 2008, 11:01 PM   #6
Jeb-D. is offline Jeb-D.  United States
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When green is used for safety ground, what color is to be used for the control grid?
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Old 31st December 2008, 11:13 PM   #7
mashaffer is offline mashaffer  United States
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I have seen these charts before. The question I always had was what color do you use when connecting say a plate to a grid? Grid color or plate color? How do you choose?

The only reason I drive the 91 Colony Park is that I can't afford a 65. Me old school? Couldn't be.
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Old 17th March 2010, 07:27 PM   #8
oodi is offline oodi  Canada
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Wow, this took a long time to find. Didn't think of looking in the ARRL handbook. Probably in there as well.
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Old 17th March 2010, 11:04 PM   #9
theoldtrout is offline theoldtrout  United Kingdom
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Many years ago when I was a student I was taught this colour scheme:

Red, HT
Orange, g2
Grey, g1
Cathode, pink
Heaters, yellow
Black, chassis
Purple, -ve supply. eg bias
Green, mains earth.
Brown and blue were reserved for the mains wiring, as per European standard.
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Old 18th March 2010, 02:10 AM   #10
llwhtt is offline llwhtt  United States
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Radiotron Designer's Handbook 4th Edition has lots of that cool info. Just by coincidence that book is from downunder!!!!

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