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One thing to check--Make SURE--you have the caps wired right. I say this because a LOT of vintage SS stereo and amps which use PNP transistor topology, had POSITIVE ground--NOT negative. I would say a 66 model would fall into this category.
If this is not the problem...there may be some sort of "spike" getting to the caps. Perhaps a bit too much AC ripple getting to them. Leaky B+ diodes WILL cause this . After all--you have plenty of voltage margin on the caps--so it HAS to be something like that.
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