[BC] RCA BTA5L & and other numbers (MAKE CORRECTIONS TO LIST)HISTORY

[Milton Holladay]

What you call the BTA-5R and 5T were actually the 5T and 5U. Umber gray with 
pink, blue, green or yellow were available. WIS/WVOC has a pink 5T; it 
always ran ~ 1.5 amps and performed quite well; now aux.
WEAM , Morningside MD had a 5 or 10 U and was a supermodulator until the 
125% limit began.
M
----- Original Message ----- 
From: <DHultsman5 at aol.com>
To: <broadcast at radiolists.net>
Cc: <barry at oldradio.com>
Sent: Thursday, May 01, 2008 7:19 AM
Subject: Re: [BC] RCA BTA5L & and other numbers (MAKE CORRECTIONS TO 
LIST)HISTORY


>
>
> ***************
>
> Even though the letter sequence was different I believe the 5L was the
> Ampliphase???
>
> BTA-5D  1 kW Driver Cabinet into 5 kW PA 891 Class B Modulators into  892 
> RF
> Amp
> BTA-5E   Same Design Different  cabinet
> BTA-5F   new Design Mainly Cabinet 892's Modulating single  892
> BTA-5G
> BTA-5H
>
>               One of the above was the first use two each  5762 RF
> amplifiers   Modulated by two (5762's or) 3CX3000 and used tube type 
> thyratrons for
> power  control.  Three Brown cabinets. 10 kW. version used three 5762's in 
> the
> PA.
>
> In this era the numering changed as I recall.
>
> BTA-5R  two Cabinet  two 3CX-3000 modulating a single RCA  5762 with 
> Cathode
> and plate resonators
> BTA-5T  three Cabinet 5 kW same tubes could be upgraded to 10  kW  (Same
> Cabinet as 10 kW)
> The later model of the tha above same two transmitters had a different
> letter and used the RCA Version of the rectangular API style meters.
>
> There were several color changes in these models,  Red,  Dark  blue with 
> lite
> blue doors and dark blue cabinets & doors.
>
> The 5762 tube was stretched as its nominal current rating was 1 Amp.   It
> took between 1.25-1.30 Amps to make 5 kW. with 5400 Watts into a DA 
> system.  The
> type, using both cathode and plate harmonic resonators  could barely make
> this power and have an positive peaks.  RCA sold  alot of them but lost 
> out
> mainly to positive peak modulation performance.
>
> The Next transmitter to follow the 5R/5T series was the Ampliphase
> transmitter.  As I recall RCA didn't make a 5 or 10 kW. Ampliphase using 
> the older 22
> tybes exciter as the did with the 50 kW.  The first five and  10 kW. were 
> made
> using the RCA solid state Ampliphase Exciter and was in a blue  cabinet 
> about
> 60 inches wide.
>
> I recall,  the first 5 & 10 kW. RCA Ampliphase rigs using the  solid state
> exciter were the BTA-5L and BTA-10L.
>
> I know we have some more knowledgable RCA experts on this forum.   Please 
> add
> to and update this list.
>
> Dave Hultsman
> Continental Electronics
>
>
>
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