[BC] Re: Oldest Transmitter still in daily service

[Jerry Mathis]

You are correct; I was referring to the Harris 1T and the 1G when I referred 
to the transmitters with the 807's. I worked on several BC-1G's, and one 
-1T. I hated the G's, especially that circuit board that burned up so 
easily. But I hated the design most of all--the 807's had to be replaced 
every three to 6 months, because once they started to go weak, transmitter 
performance went downhill fast. In the Raytheon RA-1000, I've seen the tubes 
(except the 833's) last up to 10 years.



Jerry Mathis
Clear Channel Radio, Tupelo & Meridian MS





>From: "Phil Alexander" <dynotherm at earthlink.net>
>Reply-To: Broadcast Radio Mailing List <broadcast at radiolists.net>
>To: Broadcast Radio Mailing List <broadcast at radiolists.net>
>Subject: RE: [BC] Re: Oldest Transmitter still in daily service
>Date: Mon, 12 Dec 2005 08:46:09 -0500
>
>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
>
>
>
>
>
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