![]() I would caution that you be careful if you apply voltages to the transformer. The configuration would be: plate 1 to screen 1 to center tap to screen 2 to plate 2. from one plate to its corresponding screen would be around 4 ohms. ![]() For example if the plate to plate value is 20 ohms then the screen to screen might be 12. The values for the screen taps will be less than that for the plate taps but not zero. ![]() If the transformer is for ultra linear use, it may be possible to measure the resistances with an accurate meter. If there is a single secondary (only 8 ohms or 4 or whatever) then you are home free. The secondary windings (speaker) will have rather low resistance readings and unless your meter can read very low ohms (0.1 and lower) it will be difficult to separate the various taps. For example if the reading plate to plate is 20 ohms, the reading to the center tap from either plate tap will be half that reading or 10 ohms. If you measure the resistance between them, the reading between the two plate taps will be higher than to the center tap. If so, and they aren't for ultra linear use there will be two plate taps and one center tap on each transformer. ![]() From your description it seems that the transformers are for push pull use. Even premium transformers have a certain amount of DC resistance in the windings. Greetings, One way to determine which windings are plate taps and which is the center tap (for power) is to use a meter that can read fairly low resistances.
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