On 08/23/2013 05:33 PM, Shaun wrote:


"Michael A. Terrell" wrote in message

I built a two meter repeater on 146.01/61 MHz for my school's ham
radio club. One of the TV stations I worked at was an empty building
before I laid out the equipment room, installed the transmitter and
processing racks. That was a 1952 model TTU-25B UHF TV transmitter on
Ch. 58 that was built by RCA. Parts were no longer available from RCA,
since they were out of the broadcast business. That only made the job
slightly harder, since there had been no new final tubes made for about
20 years, and no company had managed to rebuild one that could put out
anywhere near the rated power. Nice water cooled stainless steel jugs
with 7 KVDC across the coolant. Twin 1000A 1.5V filaments that had to
be balanced by stretching copper bussbars used as variable resistors.


Didn't Comark (division of Thomson Multimedia) service RCA customers
well into the 1990s? When I went to IOT school in 1995 they still sold
RCA renewal parts. Comark bought RCA (including the rights to Nipper).
Now they are both part of Thales, a French defense contractor.