Hello Joe:

I question whether there is a problem with the driver transformer. What are
the symptoms, other than the different value of resistance? Is this just a
general check of everything or is the audio section having a problem.

There are a number of possibilities. First, the factory could have
substituted a different transformer from that specified. This happend more
than infrequently, in order to keep the rigs flowing. They are not
critical. Secondly, the ohmmeter might be something other than a pure dc,
in which case the resistance might not be correct when inductance is
involved. Another possibility is that the factory put the wrong transformer
in the case and it got mismakred - but it was close enough that it passed
factory specifications.

A shorted driver transformer could cause excessive current draw by the
driver tube, or distorted audio.

If the winding ratio was different than the one specified, that would not
cause any problem for the modulator, other than possibly lower audio because
there was less drive to the modulators.

The 1958 thordarson catalog (which is about the time the T-90 was made)
shows a number of driver transformers. None of them have numbers close to
the number you cited.


73, Colin K7FM