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Old 7th April 2013, 02:07 PM   #1
wf1318 is offline wf1318  Hong Kong
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Default 5 leads pp output transformer

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Hello everyone!
I am new in tube amp, and I have a question about PP Output Transformer.

Above is a 5 leads 5K PP output transformer picture.
P1 to P2 is 5K, B is CT
So, what is the value for UL1 and UL2? How to determine it?

It's that it is a 2.5K-1.25K-0-1.25K-2.5k structure on the primary winding?

Thanks!
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Old 8th April 2013, 12:07 PM   #2
Tesla88 is offline Tesla88  Italy
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UL Taps are for Ultralinear push pull operation , they goes to pentode screen , often they are taped at 43% between center tap and plates...

Only way to determine without a datasheet is to apply an AC voltage to the transformer and measure voltages at UL connections ...
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