Need 50L6 output xfmr

[Paul Litwinovich]

I've seen these before. hard to find, but you really won't notice the 
difference if you put the B+ straight to the screen and use a conventional 
output transformer. I had to do that once on a similar model. They feed the 
screen with the audio 180 deg out of phase but low level, just enough for a 
little gain reduction which produces less distortion, just like using a 
feedback network on an AM modulator. We are talking about what you could see 
with a good distortion analyzer, not something that you will likely notice 
with your ears. You can increase the cathode resistor by a step or two and 
accomplish the same thing.

Paul A. Litwinovich
Director of Engineering
WSHU AM&FM WSUF FM
PG-GB-039245
N1MUC


----- Original Message ----- 
From: "George Maier" <George at MAIERGROUP.COM>
To: <BOATANCHORS at LISTS.TEMPE.GOV>
Sent: Thursday, September 09, 2010 11:30 PM
Subject: [BOATANCHORS-TEMPE] Need 50L6 output xfmr


> OK..so I was strolling around the last MIT flea market in Cambridge, and
> spotted a really cute little RCA 65X1 AM radio, ca. 1948. It's a classic 5
> tube all American AC/DC design, with a brown Bakelite cabinet. The kind of
> thing my XYL would actually like on the bookshelf (I tried a Zenith TO,
> didn't take too well).  Of course it followed me home.
>
> The good news: it's very clean, all original, and complete; even to the 
> pins
> that hold the pressboard back cover in place.
>
> The bad news: the audio output transformer is open - oops!
>
> Does anyone have a spare vintage output xfmr hanging around? 
> Unfortunately,
> it's not a garden variety single ended output XFMR. The B+ is fed through 
> an
> off-center tap, with the remaining leads going to the plate and screen.
>
> Thanks for the read...
>
> 73, George - W1LSB
>
>
>
>
>
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