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RE: Advice on Substituting Western Electric 412A for 6X4?

The 6X4 draws 600 mA. of heater current and is capable of supplying up to 70 mA. of B+ current.

Changing the rectifier type will alter the B+ rail voltage, which can lead to unpredictable (including damage) results.

IMO, change for its own sake is highly suspect.

BTW, let's assume no damage will occur. If PSU voltage regulation is part of the design, genuine sonic change is unlikely to occur.

FWIW, types electrically similar to the 6X4 are the Octal 6X5 and Loctal 7Y4.

Eli D.

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