[R-390] 600 to 8 ohm speaker converter

[Dan Martin]

Years ago the Hammond 119DA was popular with some of us as a 600 to 8 ohm transformer for the 390’s.

Still available at the usual supply houses for $30-40. Certainly not the cheapest solution but it’s an excellent transformer. 

My own alternate solution for years has been to use the diode load output with a tube amp with an 8 ohm output - but that’s not the cheapest solution either. 🙂

Dan

Sent from my iPhone

> On Feb 14, 2022, at 2:06 PM, Robert P. Meadows <rpmeadow at bellsouth.net> wrote:
> 
> The R390 series of radios have a 600 ohm audio out system to feed distribution amplifiers. 
> The speakers that were used then were 8 ohm for the most part, but, driven by specific amplifiers at the point of listening to the radio.
> You can properly accomplish the listening deed with for the Navy installation, acquiring an AM 215 (from memory) and speaker.
> Or as most do, with limited audio signal due to the radio design, use a 600 ohm to 8 ohm speaker transformer.
> R
> 
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On Behalf Of K PERALES
> Sent: Monday, February 14, 2022 1:49 PM
> To: R-390 at mailman.qth.net
> Subject: [R-390] 600 to 8 ohm speaker converter
> 
> When I got my R-390 it has what I assume to be some kind of transformers to allow a modern 8ohm speaker to be hooked up.  I did not think to diagram how the wires were hooked up.  Is there any manual that tells a non-electrician how to connect these transformers to the R-390A to let me listen without headphones.
> 
> Ken
> 
> 
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