Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => EZ Board postings => Topic started by: Geezer on June 17, 2005, 10:08:14 pm
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Hoffman Amplifiers
> Tube Amp Building - Tweaks - Repairs
> New Lead and Bass 50
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JimiB
Junior tube assistant
Posts: 36
(3/9/04 4:24 pm)
New Lead and Bass 50
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I am helping a young friend build a Lead and Bass 50 and we fired it up for the first time today everything looks good (now that we added the wires to pin 6 of the el-34's from the bias circuit that he forgot) except we are seeing 350v on pin one of V3 (p.i.) and 170v on pin 6 also the amp is very quiet (maybee we killed the power tubes I redplated them several time trying to solve the bias circuit problem)
Any Ideas on the P.I. voltage issue?
PHATamps
I only work on tube amps
Posts: 426
(3/9/04 9:15 pm)
Re: New Lead and Bass 50
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Are the cathodes of the PI jumpered together? Also, double-check the values of the PI plate loads.
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