Thanks Harold for the quick response! Darn, that must mean my driver
transformer *is* fried. It's the original one because the
factory-applied red varnish on the solder joints is intact. So, the hunt
begins for a replacement. It's got a Thordarson part number stamped on
it (T-54296) but it's not listed in either of the two Thordarson
catalogs (dated 1942 and 1980) that I found on the Web. Maybe it was
custom made for H/W.

Also found an open 27K resistor in the clamp circuit. Finding a
replacement won't be as tricky as finding the transformer, hi.

It's true, no one expected us to be using these things half a century
later. But the T-90 was so well crafted, it would be a shame not to
bring it back to life. I've got an R-9A fixed up and waiting for its
mate.

Thanks again for the help!

73,
Joe K9LY


In article .com,
" wrote:

Joe,I have a H/W T-90 The mod driver shows 400 Ohms one side and 390
other side. On these older rigs it is not uncommon to find un-balance
in the windings and many have had the driver xfmr replaced,,windings
are extremely small. gauge wire..I know the people that built them
never expected us to be using them over 50 years later...hi..A great
little rig... 73 Harold W4PQW