[R-390] R389 and R390 faults
Paul H. Anderson
paul at pdq.com
Tue Mar 21 14:09:30 EST 2006
Be careful of the PS's - there are several mods for them, the first R-389
didn't have B+ in the same place as the R-390/R-391, so they in theory
later modified the R-389's to match. If they didn't, then you will have
no B+, or B+ on the wrong part of the connector.
My R-389 manual had some addendums that gave this information - I can't
recall, but maybe one of the R-390 manuals I have did, too.
Other than that, the IF and AF I believe interchange freely.
Paul
On Tue, 21 Mar 2006, Rob Filby wrote:
> Hi.
> I have recently bought an R389 and a pair of R390 rxs. They are all
> complete and in good condition. At first appearance it seems as the PSU,
> Audio stage and IF strip are interchangable. I have a few questions
> which I would to ask the group and perhaps somebody could help me
> please.
>
> 1.Were any parts listings produced for the above rxs, ie detailing the
> wattage of resistors and the voltage ratings of other components?
>
> 2.Are there any common faults or other troublesome components that fail
> or give trouble that I need to be aware of?
>
> 3. I have a couple of R390A rxs which have a mechanical counter for the
> BFO, why was this used over the standard knob?
>
> Thanks for your help
>
> Rob.
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