[R-390] R-390 600 ohm audio solution

[chuck.rippel at cox.net]

The R390A has an audio output of 600 ohms which means it will not work 
well at all into an 8 ohm loudspeaker.    The very best choice is to 
purchase a Hammond model P-T119DA 600 ohm primary/8 and 4 ohm secondary 
audio transformer currently priced at $26.20 from Antique Radio Supply. 
The late Fred Hammond and I had a phone conversation one afternoon 
talking about some shared issues with our Collins 20V-2 transmitters and 
I mentioned that no one made any 600-8 ohm audio transformers.  Fred 
answered that he had a personal, wide frequency design used when Collins 
was building 75A-4's in Canada and would that work?  He sent a sample, 
its as big as your fist and is rated something like 30-20,000 cycles, 
easily 10W has a 600 ohm primary with secondary taps at 8 and 4 ohms.

You don't have to use 70v line transformers, etc.....  This works 
wonderfully and is a direct solution.  I've linked the product directly, 
below:

http://www.tubesandmore.com/products/P-T119DA

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No  trees were killed to deliver this message.  However, a large number 
of electrons were terribly inconvenienced.

Chuck Rippel