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Hoffman Amps Forum image Author Topic: Branch circuit?  (Read 1968 times)

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Offline davidwpack

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Branch circuit?
« on: February 26, 2019, 10:57:48 am »
I think I know the answer but is there any problems branching the filament circuit? In other words running the transformer's filament wires to a terminal then running 1 set of wires to the tube filaments and another set to the lamp? Not sure I want to try it yet but I think I may be able to do a neater run of wire this way.  Danke ye!

Offline sluckey

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Re: Branch circuit?
« Reply #1 on: February 26, 2019, 11:10:26 am »
No problem at all. I've had to do this on several builds, mostly because of using salvaged PTs with too short leads. Looks better than splicing wires IMO.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline vampwizzard

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Re: Branch circuit?
« Reply #2 on: February 26, 2019, 11:15:16 am »
agreed. The main reason its done paralleled is to save on the amount of wire. not that heaters fail on you often but you'd be easier to diagnose any issues more easily as well.

Offline davidwpack

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Re: Branch circuit?
« Reply #3 on: February 26, 2019, 11:29:00 am »
Thanks guys!

Offline jjasilli

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Re: Branch circuit?
« Reply #4 on: February 26, 2019, 06:51:40 pm »
Yes, and note that a typical filament string carries a lot of current, requiring heavier gauge wire.  With "branches", you may have the option to use thinner gauge wire, where less current is flowing.

Offline davidwpack

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Re: Branch circuit?
« Reply #5 on: February 27, 2019, 08:43:20 am »
Yeah, I ran 22g to the lamp and 20 for the filaments.

 


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