[R-390] Never heard the real R-390

[James M. Walker]

Some time back in years, I bought the Radio Shack 1K ct. to 8 ohm
transformers,
about 10 of them. I also purchased blue perfboard and "stacking terminals"
mounted
the transformers on the boards. I use one on each output of the various
receivers
that have 600 ohm output for the audio, including SP-600JX-17, SP-600JX21,
a pair of R-390As and my band cruising Hallicrafters SX-62A, all with no
problems and the audio sound great. I have a pa amp at 30 watts that is in
the
garage and it is fed from a single R-390A in the house, also sounds darned
good
outdoors.
Jim
WB2FCN

----- Original Message -----
From: "Laird Tom N" <LairdThomasN at JohnDeere.com>
To: "Andy Jackson" <andy at champ1.freeserve.co.uk>; <r-390 at mailman.qth.net>
Sent: Thursday, July 29, 2004 12:04 PM
Subject: RE: [R-390] Never heard the real R-390



You can also purchase a new Hammond matching transformer from AES in Tempe,
Az.
for $18.95 USD, that is made for this application.

Tom WC9M
Moline, IL.


> Chuck, just in case you don't know, the speaker output is 600 ohms
> impedance. You can use a cheap radio shack 12 volt filament transformer
> (smallest one) to match the common 8 ohm speaker. Even then, stock audio
> isn't impressive. Steve KJ8L

A good source for 600 Ohm to 8 Ohm matching transformers is the LS-166/U
loudspeaker used with various vehicle and manpack sets. The transformer is
rated at 2 Watts and has a stated frequency range of 250 c/s to 5000 c/s.
Either use as-is or connect to a better 'speaker for improved "Fi".
They are not too hard to find even in the UK or Europe so I imagine even
easier in the US.

Andy G8JAC

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