• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

5 leads pp output transformer

opt21.gif




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!
 

Tesla88

Member
2011-12-21 8:37 am
Italy
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 ...