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

[Byron Tatum]

    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. 
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