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RE: tubes that interchange with the CV378?

The 5U4GB is a much safer swap. Forward drop in a 5R4 providing 250 mA. of B+ is a whopping 67 V. :>( Also, the 5R4 is less tolerant of a good sized, if not huge, capacitance in the 1st filter cap. position than the 5U4GB.

Study the data sheets of the 3 types being discussed.

GZ37 Datasheet

5U4GB Datasheet

5R4 Datasheet


Eli D.


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