Do the tubes all light up? If they do-good. If one or all of them don't, your first problem is related to power supply. You may have a rectifier tube that is bad. If everything lights up, it's time to start investigating the amplifier section. Without knowing the numbers of the units involved, it's hard to give more accurate advice.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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