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That rear tube marked 25L6 is really a 25Z6. It's used as a rectifier in the conversion. It has two plates and two cathodes that should be paralleled. The original tech should have re-labelled the chassis. In the radio's original state, they had the plates and screens on all the tubes running at 32 volts and the audio output was very weak. That's why they used three 25L6's.
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