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

Posted by Jim Hodgson (A) on May 27, 2017 at 05:18:25

In Reply to: RE: Advice on Substituting Western Electric 412A for 6X4? posted by Eli Duttman on May 26, 2017 at 21:41:22:

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!

• http://www.r-type.org/pdfs/12x4.pdf   (Open in New Window)

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