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

[Cecil]

Constipated.....

Naaa....not since I began opening up and cleaning out my stock of old R-390 meters.  The Kielbasa helps too...

You should try it...no test gear required.

Cecil

Sent from my iPad

On Dec 27, 2012, at 2:36 PM, Robert Newberry <N1XBM at amsat.org> wrote:

> Hey, I appreciated it and I personally have had good results voice coil
> transformers. I've even used spectra plus to check the results. I've found
> their frequency reproduction to be full with no nulls. I've found a few
> that were sub-par, but they are abundant.
> 
> I will warn you some of the constipated individuals on this list I do not
> have a lab full of equipment, and never worked for bell labs. Just a simple
> man with a little test gear.
> On Dec 27, 2012 3:16 PM, "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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