[BC] Re: CE transmitter

[Milton R. Holladay Jr.]

Years ago, WKYB put in a BC-10H and foolishly let the BTA-5T go.It was such
a pain that they replaced it with an
AEL...................................(seriously)
M
----- Original Message ----- 
From: "Kevin C. Kidd" <kkidd at kkbc.com>
To: "Broadcast Radio Mailing List" <broadcast at radiolists.net>
Sent: Wednesday, May 18, 2005 11:44 AM
Subject: Re: [BC] Re: CE transmitter


>
> Ah the memories...
>
> I briefly maintained a BC-10H running 5kw in the mid 80's.  It would eat a
> handful of the audio driver Q's on regular occasions.  The old BC-10H gave
> pretty good service but required a lot of maintenance & TLC to keep it
that
> way.  I was summarily fired from that station because of "engineering
> costs" and was replaced by a DJ who happened to own a tool box.  About a
> year later I was called by the owner (station was under LMA, I was fired
by
> the LMAer) to check the BC10 which had been off the air for months.  I
> discovered that my replacement had been replacing the 1 and 2 watt
> resistors in the audio driver with Radio Shack 1/2watt's and the Q's with
> non-compatible ECG's (a transistor is a transistor... right?) and non
> polarized caps with electrolitics and a large area of the AF driver
circuit
> brd was totally burned away and the HV contactor was bypassed with pieces
> of #12 wire and the little RCA 1kw stby/nite TX was using the BC-10's mod
> xformer.  The BC-10 did have a new RF driver tube in it.  I told the owner
> that he should jack up the new tube and drive a new transmitter under it.
>
> He was not amused.
>
> The 10 was subsequently replace by a BC-5P that as I understand was
> intended for export as manufactured.  The 5P had tube (807?) audio
> drivers.  It was pretty stable and remained in operation until abt 2 years
> ago when it was replaced by a BE solid state.  The BC5 is still in place
> but not immediately operable due to parts scavenging.
>
>
> At 09:43 AM 5/18/2005, you wrote:
> >On 17 May 2005 at 22:24, DHultsman5 at aol.com wrote:
> >
> >Dave,
> >
> >ISTR the Gates BC-5H and BC-10H were fully transistorized except for
> >modulators
> >and finals just like the MW-5 and MW-10. The difference was they were
plain
> >old high level plate modulation also like the MW-5 and MW-10 and,
naturally,
> >had a pair of modualtors (3CX3000's IIRC) and a pair of finals because
two
> >were less expensive than one (believe these were 3F2500's). ISTR that the
> >"H" designation meant "hybrid" IOW tubes with solid state drivers.
> >
> >However, you are right in saying neither the 10H nor MW-10 can claim the
> >first 2 tube title although the only tubes were PA and mod. output. :)
> >
> >Phil Alexander, CSRE
> >Broadcast Engineering Services and Technology
> >(a Div. of Advanced Parts Corporation)
> >Ph. (317) 335-2065   FAX (317) 335-9037