[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.



More information about the R-390 mailing list