[Milsurplus] WW II Morale Amp

[konrad werzner]

I think they may have used this type of phonograph for the RBO speaker
system:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rt=nc&nma=true&item=330513646160&si=16iJvh3ru8NoeFno6zjp02Cqck8%253D&viewitem=&sspagename=STRK%3AMEWAX%3AIT
This Navy phonograph has an actual "RBO" output jack if you look very
closely in the photo.  This amp uses loctal tubes and uses a power
transformer.  Price was a little high for my liking, though I may start
looking for this one for our RBO system hookup.

Konrad

On Mon, Jan 17, 2011 at 3:19 PM, J. Forster <jfor at quik.com> wrote:

> Opinions please:
>
> The more I look at a 1 tube Morale Amp from the MASSACHUSETTS the more I
> believe it was a modified cheap phonograph. The design is AC/DC with a
> single 117N7 tube; input and output transformers, and very little else.
> The purpose was to amplify audio from a 600 Ohm bus to drive a small
> speaker in the officers' staterooms. The buses were driven by RBOs in
> Radio 2.
>
> I suspect some of the crew went into Boston to Radio Shack and bought a
> few record players. This would have been in 1941-42.
>
> A cheap phonograph could have had a high output, crystal cartridge and a
> simple, very low parts count amp, probably built on an "L" shaped plated
> steel chassis.
>
> The crew would have bought a couple, pulled the chassis and speaker and
> added the input transformer and possibly changed the volume control.
>
> Does this seem plausible?
>
> Best,
>
> -John
>
> =============
>
>
>
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