[BC] Re: Oldest Transmitter still in daily service

[Phil Alexander]

On 11 Dec 2005 at 22:03, Jerry Mathis wrote:

> But the RF and AF circuitry was excellent. Plenty of drive was designed into 
> the transmitter, so you could get more life from the tubes than the Harris 
> boxes. I forget if it was one or two 813's driving the RF final tubes, and 
> the audio side had a pair of large tubes (I forget their type number; brain 
> freeze). The Harris boxes had 807's. Not even a close resemblence.

Jerry,

You seem to be confusing the Gates/Harris BC-1T with the Gates BC-1F.
The BC-1F was manually tuned unlike the Raytheon, however it used very
nearly the same tube line up except for the Raytheon using a push-pull
pair of 813's for RF drive and the Gates using a single 813. The only
807 in a BC-1F was the oscillator that drove the 813 buffer/driver.
The modulator driver in the BC-1F used a push-pull pair of 845's with
those heavy looking carbon plates.

Ten years later, the original BC-1T design used 6BG6's for RF and 
modulator drivers which were replaced after a few years with 807's.
While there may not have been much resemblance between the Raytheon
and the BC-1T, it is fairly clear someone at Gates followed more or
less the same lines of thought as Raytheon when they designed the 
BC-1F. In their basics, they were very similar.


Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037





-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.371 / Virus Database: 267.13.13/198 - Release Date: 12/12/05