[R-390] SERIAL # 163

[Pedro Del Valle]

I have two R-90A one EAC and the other a Capehart and a R-390 Collins. None
had a Relay.
But I remember of an article in an old HAM RADIO MAGAZINE With a
modification  using a 6BE6 in sustitution of the 6BA6, for a product
detector,  and a Relay to switch AM/SSB with the BFO ON/OFF swiitch.
Excuse my poor english. Hope is of help
Pedro EA2IG

2009/3/27 RICHARD MC KINNEY <pmcknney at bellsouth.net>

> DE WB4VFN Rich
>  I have a R390a Serial @ 163.  Problem is turning on the BFO looses all
> output.  Rx is ok all bands with BFO off.  I have a manual for thr R390a but
> I guess mine is an earlier model.  The BFO in mine is nothing like the
> schematic.  Mine has a small relay that is switched on by the BFO switch.  I
> don't think this is any kind of mod as it looks factory wired.  The BFO
> circuit is also very different then the schematic I have.   The rig was
> given to me and I would love to see it work again properly.  So far I've had
> to change the 17 mc crystal and a few tubes to hear it work again.  Anyone
> have a schematic with a relay in the BFO switch?  73 Rich
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