[AMRadio] R-390

[rbethman]

I believe that the "Modern Manual" you are referring to id for the 
R-390A NOT the R-390.

The R-390 came first, and has the pair of 6082s, and uses L/C filters in 
the IF.  The R-390A came later, as a cost reduction version.  It uses 
Mechanical Filters in the IF.

Both are great radios, BUT they are very different.

It really needs to be determined WHICH one has before offering 
information and suggestions.

Additionally, there is an R-390 list on the QTH.net servers that 
specializes in both of these fine radios.

Bob - N0DGN

On 5/10/2011 5:24 PM, Alan Victor wrote:
> It is a wondeful receiver to work on and there are numerous references. On
> line there is a R390 modern version of the manual which is over 500 pages.
> It is worth downloading and a study. A Video CD of the repair and
> maintanence is also available and a worthwhile investment.
>
> On Tue, May 10, 2011 at 2:56 PM, Steve<zarco at sonic.net>  wrote:
>
>> Great receiver....my all time favorite, and I've had several.
>> I'd suggest doing the usual prelimary stuff first; check tubes
>> (including for shorts!), check B+ voltages, and look for
>> shorted bypass caps (esp in the IF's). The R-390 has a
>> voltage regulator using a pair of 6082's and there are
>> often issues here. Good luck!
>>                             Steve W6SSP