Re: {Collins} 75A-4 Audio Transformer Data

[Gary Follett <dukeshifi@xxxxxxxxxxx>]

I have a replacement for this transformer if you need one.

Gary



On Jan 16, 2010, at 5:41 PM, Joe Eide wrote:

> Hi Steve,
> 
> DC resistance across the primary should yield about 250 ohms.
> 
> DC resistance across the secondary should be about 21 ohms to center tap and an additional 0.4 ohms for the other side of center tap for a total of 21.4 ohms.
> 
> The audio transformer is Collins Part# 667-0018-00.  (5000 ohms primary,  500 ohms tapped at 4 ohms secondary) (300 ~ 3500 cps)
> 
> I believe this xfmr was used in all 75A series receivers.
> 
> Hope that helps Steve,
> 
> Joe - KB9R
> 
> 
> 
> Steve Whitefield wrote:
>> Greetings All,
>> 
>> Could someone please confirm the DC resistance measuements of the primary
>> and secondary windings on a 75A-4 audio output transformer? I am seeing
>> approximately 270 Ohms on the primary and approximately 87 Ohms across full
>> secondary (ignoring 4 Ohm tap). I believe it to be labeled T-8 in the
>> schematic.
>> 
>> Thanks in advance!
>> 
>> Vry 73,  Steve   K3ERN
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> _______________________________________________
> SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY !
> http://www.collinsradio.org/membership/
> 
> NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific
> SUNDAYS: 14.263 MHz-2000 UTC  +  AM Net: 29.050 MHz-1200 Central
> 1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT)
> 
> LIST HELP?  ADMIN EMAIL:  collins-owner@xxxxxxxxxxxxx
> This ONLY goes to the list admins and does not post to the group!