[AMRadio] Bad news on BC1-J Mod trans.

[wwd at netheaven.com]

In <de.242442f8.29ca9f23 at aol.com>, on 03/20/2002 
   at 09:27 PM, K9MUF at aol.com said:

>In a message dated 3/20/2002 12:49:05 PM Central Standard Time, 
>billsmith at ispwest.com writes:


>> I looked up what I think is the mod transformer in the Peter Dahl catalog.
>> Too bad about the replacement cost, but notice that there are apparently 
>> two
>> secondaries on the transformer.  Have you identified both secondaries?  (My
>> apologies if this is too simple.)
>> 
>> GATES BC-1 MOD TRANSFORMER
>> P/N 478-0410-000
>> CORE) A-0525/ C-CORE         STYLE #) 09  HIPERSIL C-CORE
>> 
>> PR) 2450 VCT PP 833A'S
>> 
>> S1) 1800 VAC @ 750 VA
>> S2) 80/110/155 VAC @ 8 VA
>> 
>> DM) HT = 10.625 WT =  7.375 DT =  6.750 MD =  4.750 MW =  5.750
>> PRICE)    $995.00 Plus S&H FOB El Paso, TX    WEIGHT)   49  LBS
>> 
>> 73 de Bill, AB6MT
>> billsmith at ispwest.com
>> 

>What is the meaning of voltage ratings when given for a modulation 
>transformer? These surely don't mean breakdown voltages. I have a
>modulation transformer from an RCA broadcast transmitter. The 
>specification plate on it says:  PRI  - 2560V CT at .25A ,       SEC  -  
>2100V at.31A
>How can I relate these ratings to impedances?
>This transmitter used a pair of 4-400's modulated by a pair of 4-400's

>Thanks

Don't worry about impedances. Use the figures RCA gives you. I.e. use the
appropriate tubes for those voltages @ those currents. Or as approximate
as you can get. By giving you those figures RCA has done all the hard
thinking for you.  ;)

Bill    N2KQA
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