[R-390] R-390 Non-A module interchangeability

[Flowertime01 at wmconnect.com]

Bill,

Nice timing on this question. I think I may have one in the basement.

The one I am looking at has no wire on one end of the 20 Amp, DC fuse. I 
have a wire taped off in the harness. I have not had time to look at the 
problem as I am still washing out the stuff left by last residents.  I am working 
on the digital camera and will take photos of what I have.

I hope you Fellows can get some photos of your versions and we can get all 
the flavors on a web site or CD version.

Roger AI4NI

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There was an early field change that modified the power supply,
and made unmodified power supplies incompatible.

IIRC, the mod brought out the B+ return (lifting it from ground
in the PS) using the wire for 24 VDC that was used for the really
rare 24 volt power supplies. Rare because the dynamotor or
thyratrons made too much noise, reducing sensitivity.

The mod also involved the B+ fuse on the chassis somehow.

Bill Hawkins
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