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Old 02-11-2017, 12:01 PM
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jr_tech jr_tech is offline
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Quote:
Originally Posted by Electronic M View Post
For now don't connect any wires leaving that trans to each other (especially ones from the same winding).

Assuming the Radiola has good filament voltage to the 80. All you need to do is swap rect plate windings, power the admiral trans line winding off a variac, and meter it as you increase the voltage. Once B+ is at factory levels measure the variac output. depending on what it is there are ways of using multiple windings and or the two transformers in tandem to get AC inputs that do not match line voltage.
The 80 is likely wired as a full wave rectifier, so you will also need to connect the center tap of the plate winding to ground.

Edit add: Just looked at the schematic, apparently B- is not grounded in this set, so the center tap is just connected to the common point of the two filter caps, as shown.

jr

Last edited by jr_tech; 02-11-2017 at 12:34 PM. Reason: add info
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