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Old 13th January 2013, 05:17 PM   #1
kkcinc is offline kkcinc  United States
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Default SSE power transformer question

When you have exactly 440 B+ with tube rectifier and a 370-0-370 transformer, what can you expect your B+ to be with 375-0-375 transformer and same tube rectifier? What about solid state which I haven't tried with the 370-0-370?
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Old 13th January 2013, 05:50 PM   #2
DUG is offline DUG  Canada
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440*375/370=445.9459

At most a 1.35% increase in voltage.

And at most a 1.35% increase in power dissipation. (tube = constant current load)

This also assumes that the different transformers have equivalent source resistance.

Solid state Will raise the B+.

Be careful you do not exceed the filter cap voltage rating or the current supply capability of the transformer. Tube rectifiers offer a free "soft start" function that SS diodes don't.

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Old 15th January 2013, 11:36 AM   #3
kkcinc is offline kkcinc  United States
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Thank you. I don't have the new tranny yet so I couldn't put the meter on it. This will help with my estimations. Edcor is great, but slow.
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