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

[Ben]

Just remember no good deed goes unpunished 

I can be miserable anywhere.

On Dec 27, 2012, at 14:16, "KR4HV" <kr4hv at numail.org> wrote:

> To all: Please disregard my previous posts regarding line to voice coil
> transformers for use on military and BA equipment. While they work fine for
> me, they may not meet the standards of the group.
> 
> Sorry to have wasted your time with my posts..
> 
> Walt
> KR4HV
> 
> 
> 
> 
> 
> 
> 
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
> On Behalf Of chuck.rippel at cox.net
> Sent: Thursday, December 27, 2012 1:36 PM
> To: r-390 at mailman.qth.net
> Subject: Re: [R-390] R-390 600 ohm audio solution
> 
> 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
> 
> ---
> No  trees were killed to deliver this message.  However, a large number of
> electrons were terribly inconvenienced.
> 
> Chuck Rippel
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