[R-390] THE R390A Audio Transformer ! Do You Have One?

[Jeff Adams]

Yea.  Digikey has them also, and they are always sold out.
I need a few more for my R1051.

Radio Shack no longer sells the line transformers....


73, Jeff KG4RZM
www.jeffreyladams.com


> Most know about this but just in case.
>
> I was having a conversation with the late Fred Hammond some years ago.
> During the conversation the subject of 600-8/4 ohm audio transformers
> came up and how hard they were to find.  Fred
> was not aware of the difficulty finding them and mentioned he had a
> personal design used when they were building Collins 75A-4's in Canada
> back in the day.  Fred said, let us wind a few, I'll send you a couple
> and let
> me know what you think.
>
> Wow !  The transformer is good for 12 watts (approx 24X the R390A's
> rated audio output, you won't saturate it) and is flat from something
> like... 30-20,000 cps.  It just sounds great !  In passing the feedback
> to Fred, the subject of price came up.  Cringing, I waited for his
> answer.  "How about about $17 bucks,"  would that sell?
>
> Heck yes !  So, Fred put it in Hammonds transformer line.
>
> That transformer is still available and works great with R390A's.  Its
> gone up to $26.20 over the years; Antique Radio sells it:
> http://www.tubesandmore.com/
>
>
> Model P-T119DA
>
> Transformer - Audio Interstage, Hammond, 12 Watt
> Developed in response to requests from the "Collins Collectors
> Association," this is a matching audio transformer for older equipment
> with 600 ohm audio output, driving modern speakers.
>
> Or for "classic" high impedance speakers used with newer equipment,
> simply swap primary for secondary (ie...4 or 8 ohm input and 600 ohms
> out).
>
> Key Features Isolation unit: (i.e. seperate primary and secondary)
> Primary: 600 Ohm (with 6" wire leads)
> Secondary: 8 Ohm with 4 Ohm center tap (with solder lugs)
> Power: Rated at 12 watts
> Frequency Response: 30 Hz - 20 kHz
> Weight: 1.3 lbs.
> Mounting: 2 hole u-bracket mount - on 2-3/16" mounting centers.
>
>
> There 'ya go.
>
> Chuck Rippel
> ______________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:R-390 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>