Problem With My Heathkit AA-151

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Hi Guys --
I restored a Heathkit AA-151 and it was working fine for several years. However, the bass just dropped out of the left channel...treble is fine. When I swap the Left and Right channel tubes, the problem is still there.
Any ideas on what to look for?

AA-151 Schematic (Open in New Window)

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Schiit Audio

Topic - Problem With My Heathkit AA-151 - jb3 07:46:18 08/28/06 (2)

Re: Problem With My Heathkit AA-151 - MIchael Samra 15:50:04 08/28/06 (1)

Re: Problem With My Heathkit AA-151 - jb3 17:33:46 09/02/06 (0)

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