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 Post subject: SL67- major volume loss
PostPosted: Mon, Mar 05, 2018 11:46pm 
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I've got an SL67 that just developed a severe volume loss/weak signal, but it seems to be only on the low power/variac'ed setting on the power switch? Any ideas where to start looking?

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PostPosted: Tue, Mar 06, 2018 4:55am 
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New output tubes


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PostPosted: Tue, Mar 06, 2018 12:58pm 
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Apparently it was a partial failure of the 12AX7 in V2. I swapped it out with known good ones and the amp works fine. Put the original back in and the problem is back. I've never had a preamp tube do that before. Usually for me, they just get noisy or microphonic.

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PostPosted: Wed, Mar 07, 2018 4:07am 
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Leotis wrote:
Apparently it was a partial failure of the 12AX7 in V2. I swapped it out with known good ones and the amp works fine. Put the original back in and the problem is back. I've never had a preamp tube do that before. Usually for me, they just get noisy or microphonic.


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