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It's not a 68 (drip edge era). It might be a 69, but it's more likely a 70s. Whatever it is, given that it's in that era, it will have the bias balance system...not what you would find in the 68 or BF era versions. I'm wondering if the problem might be due to that setup. Maybe one tube is horribly underbiased relative to the other and is just dying out. Has it ever been serviced?
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