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Hoffman Amps Forum image Author Topic: Control grid wiring  (Read 1971 times)

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Offline dude

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Control grid wiring
« on: February 21, 2020, 01:00:11 pm »
Would there be an issue having the control grid wires run under the board to the power tube's pin 1 of 6v6, then grid resistor from 1 to pin 5. Would the wires need to be shielded under the board? I don't think shielded wire is necessary but want to make sure.
If it ain't broke, don't fix it.

Offline sluckey

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Re: Control grid wiring
« Reply #1 on: February 21, 2020, 02:21:01 pm »
Signal is pretty big at that point. I've never shielded grid wires to the output tube even if the wires are approx 6" long. How long will your wires be? And what kind of nasty stuff will they be in proximity with?
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline dude

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Re: Control grid wiring
« Reply #2 on: February 21, 2020, 04:17:20 pm »
Wires maybe 6" at most, didn't want them over the top for neatness. Where it says HERE, from the 220Ks under the BD to tubes (around the bias), about as close as picture. I could twist them if that helps. Thanks.
If it ain't broke, don't fix it.

Offline shooter

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Re: Control grid wiring
« Reply #3 on: February 21, 2020, 05:34:59 pm »
Quote
I could twist them

I would just wire without twist, the big-ish out of phase signals might interact in un-intended ways
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Offline Willabe

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Re: Control grid wiring
« Reply #4 on: February 22, 2020, 12:09:20 am »
I would just wire without twist, the big-ish out of phase signals might interact in un-intended ways

Why would they act up?

I'd twist them them. 

Offline shooter

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Re: Control grid wiring
« Reply #5 on: February 22, 2020, 07:51:14 am »
Quote
Why would they act up
my thought was how the cross fade MV cancels out, but This morning, I do remember deferential line drivers using twisted wires so, I'm probably wrong  :sad2:
Went Class C for efficiency

Offline dude

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Re: Control grid wiring
« Reply #6 on: February 22, 2020, 11:26:11 am »
So, I'll just lightly twist them, the reason was I was going to put them under the board up threw the turrets, would be hard to redo if an issue but much cleaner looking.  Hard to stuff a 6V6 Plexi in that AO-43 chassis and have it neat and clean looking. Thanks,
« Last Edit: February 22, 2020, 11:56:57 am by dude »
If it ain't broke, don't fix it.

 


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