"David" wrote in message
...
On Sat, 30 Sep 2006 06:12:31 GMT, "David Eduardo"
wrote:


"David" wrote in message
. ..

It's still really old, which was my point. Bauer did not sell many
transmitters in that era. The 701B was a derivative of a "quick and
dirty"
model they built to fill the need of about 1,000 class IV stations for
new
transmitters when the FCC authorized 1 kw for them. I think they sold
something like 300 at the time, which was quite amazing. The 701B was
simply
an old-technology high-level plate modulated transmitter using, if I
recall,
glass envelope tubes... maybe the 4-500A.

KXIV and KRIZ both used the 707, in the '60s. KUPD got a couple in
the early '70s I recall. 4-400As.

I understood the B model at some point used 4-500's due to the relatively
short life of the US built 4-400 from EIMAC, and the transmitter's
inability
to use the European QB4-1100 (without major work), which lasted as much as
5,000 hours more than the 4-400A.

KUPD was 500 watts all through the 60's. I do not recall the 701B having a
power cutback in the stock model... must have been a modified 701 which
was
sold as a 1 kw only rig for upgrading Class IV station.

I said 707. A transmitter with stock outputs of 1 KW and 0.25 KW can
easily be restrapped for 0.5 KW.

I saw a bunch of 707's, and they were designed for Class IV stations running
1 kw always, meaning they had no cutback switch. It was brought to the
market when the FCC approved 1 kw day an night for the roughly 1000 class IV
stations in the US, and originally had no cutback. Was there a model with
such?

The issue with using a higher power transmitter for lower licensed fulltime
power is that the FCC did not approve usage of such in the 60's and a
modified right was likely not type accepted (doable with paperwork, though).
A believe the rules did not allow more than 20% or 25% greater transmitter
power than the licensed power or higher power if licensed at more than one
power level.

The 701 superseded the 707, and used 4.500's. The B model was solid state in
the exciter and audio driver, only having 4 final and modulator tubes.