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In Reply to: RE: Advice on Substituting Western Electric 412A for 6X4? posted by Jim Hodgson on May 26, 2017 at 15:43:59
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.
Follow Ups:
The 6X4 draws 600 mA. of heater current and is capable of supplying up to 70 mA. of B+ current.
Thank you for (very politely) correcting my combination typo and careless reading of a data sheet. I've edited my post to reflect the correct heater current of the 6X4.
Changing the rectifier type will alter the B+ rail voltage, which can lead to unpredictable (including damage) results.
The Sylvania manual (link below) indicates a 22 V voltage drop for the 6X4. But, I can't find voltage drop for the 412A. Maybe you or others know?
IMO, change for its own sake is highly suspect.
I should be more circumspect. I try. To be honest, the only times that I've managed to better (I think?) a designer's/builder's original tube specification have come when that specification has rejected a potentially better alternative based on its high price and/or low availability. When a change from spec happens in those circumstances, I think that everyone's motive makes sense from his own perspective.
Thanks, Eli!
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