[R-390] R-390 (Series 500) IF Unit

[Tom M.]

 Good luck with the project.  I did it and wrote the article for ER.  Still use it over 20 yrs later.  

    On Wednesday, May 29, 2024 at 08:57:05 AM CDT, Byron Tatum <bjtatum1 at att.net> wrote:  
 
     Thanks all for the help!! I now have schematics of Series 500 IF unit and the alignment info. My goal is to have a modified R-390 IF unit fitted into an R-390A mainframe for listening pleasure. I don't feel I need the mu-metal shielded PTO nor the hum-bucking filament circuit for PTO/BFO.    In this R-390A mainframe I will use the Longmont Labs modified audio deck. I studied the ER article years back when it first appeared and have had an interest in one. I have a boxed one from Longmont Audio Labs to try out, out of an estate.
    As a side note I build tube guitar amps, mostly on blank steel chassis (Fender Super Reverb size) from ZH Music. I incorporate reverb and tremolo circuits into them. I build them using my own style with "tag" strips. Attached two photos of a 100 watt build using pair of KT-88. Have cabinets custom built in 2x10, 1x12 and 2x12. I can't play but I sure enjoy listening to them. So the Longmont audio chassis sparked some interest.Sincere thanks and glad to be associated with this great group. 
______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html