Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => EZ Board postings => Topic started by: Geezer on June 23, 2005, 05:21:37 am
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Hoffman Amplifiers
> Tube Amp Building - Tweaks - Repairs
> EF86 Pin 2 & 7 Grounding Point?
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eddiejg
I only work on tube amps
Posts: 441
(5/25/05 3:58 pm)
Reply EF86 Pin 2 & 7 Grounding Point?
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What's eveyone's take on the choices:
1) right to the tube socket mounting bolt
2) run a lead back to the preamp grounding point on the PT bolt
3) run a lead back to a preamp ground point on the board or the imput jack
4) your idea here
I built 2 Nighthawk amps with an EF86 in the preamp & grounded them directly to the tube socket bolt with no noticeable noise, but is this the best way?
I'm now building a Clubman & that has an EF86 as the 2nd tube in the preamp (after the tone stack, before the volume) & I'm wondering if it'll be more critical on this build.
Thanks.
-Ed
PHATamps
I only work on tube amps
Posts: 483
(5/25/05 5:29 pm)
Reply Re: EF86 Pin 2 & 7 Grounding Point?
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I did #3 but #1 would be fine, I think.
I did #2 about an hour ago.
Just thought you'd like to know.
yellatele88
Senior tube assistant
Posts: 147
(5/25/05 9:17 pm)
Reply ef86
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I did #3. It worked quite well in my build.
zachsdad
Senior tube assistant
Posts: 183
(5/26/05 6:08 am)
Reply Re: ef86
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#1 and #2 are best done in private but #3 works best with a partner.
pblandford
Junior tube assistant
Posts: 20
(5/26/05 12:41 pm)
Reply Re: EF86 Pin 2 & 7 Grounding Point?
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I built Dougs AC30 (with AX7s) and did #1 and #3 in the same amp... It didn't like either/or... it wanted both.
Paul
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