[BC] Re: CE transmitter

[Kevin C. Kidd]

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
>
>
>
>
>--
>No virus found in this outgoing message.
>Checked by AVG Anti-Virus.
>Version: 7.0.308 / Virus Database: 266.11.12 - Release Date: 5/17/05
>
>
>_______________________________________________
>This is the BROADCAST mailing list
>To send to the list, email: broadcast at radiolists.net
>For sub changes, archives and info on this other lists: 
>http://www.radiolists.net/

-- 

Kevin Kidd, CSRE
WD4RAT
mailto:kkidd at kkbc.com

KK BROADCAST ENGINEERING
http://www.kkbc.com

AM GROUND SYSTEMS CO.
http://www.amgroundsystems.com

51 Ridge Ln
Lawrenceburg, TN 38464
Local:        931-766-2999
Nation Wide:  877-766-2999
FAX:          931-766-3974