442 Rock-Ola Amp channel issue

LyonsArcade

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Hi folks;
I've got a Rock-Ola 442 with the 47160 amp in it; I've measured the bias and recapped it, but the issue it's got is: when you first turn it on, the left channel is almost dead (really low). After it warms up for about 30 minutes, it sounds fine.

Any ideas what could cause that?
 
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