Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: labb on September 16, 2024, 05:16:30 pm
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Most AC wiring run parallel and the heater wires run over head. What say ye. Will it be a hummer or not with this wiring
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if you run the output of "V1" parallel to them, ya, she'll hum
filaments are noisy wires, with "relative" high voltage, so treat them like a poisonous snake, keep sensitive things away, you'll have a quiet amp
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The heater operate on AC and 69 cycles, wich generates noise. If you twist them, the noise will be eliminated
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I think that if heater wiring is tucked in the corner, tweed style, then it's normal / most practical to do it first.
Whereas with up and over style 60s and onwards, it's normal / most practical for the heaters to be done last, once everything else is wired.
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I prefer the "tucked in the corner" style, but either will work fine.
See: https://www.valvewizard.co.uk/heater.html (https://www.valvewizard.co.uk/heater.html) about half way down the page.
My heater wires are twisted fairly tight using the "drill method."
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... if heater wiring is tucked in the corner, tweed style, then it's normal / most practical to do it first.
Whereas with up and over style 60s and onwards, it's normal / most practical for the heaters to be done last, once everything else is wired.
That is exactly how I wire heaters when building amps.
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stole this from Steve. I've wired them "railroad tracks" over the top, tucked in the corner, the key is sensitive signals in close proximity, heed that "rule of thumb" n there's seldom ever a "hum issue"
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If I do a "tweed build", I'll stick the heater wiring down into the floor and the corner of the chassis and then I'll "fly" the other leads to the other socket tabs. I'll do the opposite on the "black panel" type amps. On the Repurposed (hacked) Garnet, the heater wiring was just pressed to the floor and far away from each other leading to the miniature tubes
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JFI: just finished the amp. It does not hum. Has some white noise when the two gain stages and the master volume are about max but I expected that. Thanks for the discussion. I tried to have this discussion on another board and was about called a heretic by the moderator. If you want to twist then twist. Probably the safest for most builders but you don’t have to. Last three amps I built were done this way. Next one I wai do like Steve’s. His looks a lot better than mine.
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... I tried to have this discussion on another board and was about called a heretic by the moderator. If you want to twist then twist. Probably the safest for most builders but you don’t have to. ...
For whatever reason, guitarists getting into electronics can be overly dogmatic.
I guess McIntosh (https://skyfiaudio.com/cdn/shop/products/mcintosh-mc30-vintage-tube-monoblock-amplifiers-restored-amplifier-559.jpg) is dumb for not-twisting their heaters (https://i.imgur.com/Zby6uzS.jpg). Tektronix (http://www.chiark.greenend.org.uk/scopes/tek.html) must be dumb for not twisting their heaters (https://i.imgur.com/xtk9j9H.jpg). It's not like those knuckle-heads know much about electronics anyway...