Deep down in my memory banks, I recall seeing an OSS transmitter from WWII
that used a similar circuit to avoid the failure of a rectifier tube, where
the 6L6 was used as a rectifier also. It did make sense, since the
rectifier tube was more fragile than the metal 6L6. Otherwise, it would
make no sense, other than to confuse your buddy - like using a 6L6 for a
rectifier and a 5U4 for the final output stage (sure it can be done).

Colin K7FM


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