Output Transformer Z Measurment Loaded or Unloaded

Discussion in 'General Electronics Chat' started by Dynaman, Sep 17, 2009.

  1. Dynaman

    Thread Starter AAC Fanatic!

    Jan 17, 2008
    Greetings Fellow Electronicsists:

    I want to calculate estimate power output on audio tube amplifiers. I need to calculate the OT's primary impedance at 1khz (my reference frequency). I know how to do all of this but my question is should I put a matched dummy load on the secondary?, or make my measurements open ended?

    I realize the load will change the circuit calcs, but a loaded DUT seems to be more realistic when calculating impedance.