R 390A Radio Ground Fault Solution

R 390a radio ground fault solution

Repairing an R-390A, the Best Comm Receiver of the Tube Era Part 4, on the air

Gregory Charvat

The mechanism of Collins R-390A/URR

Collins R390A kicking ass and taking names

R390A removing IF subchassis

WE6Z

Collins R-390 T/R (Transmit-Receive) Circuit Repair & Tuning For Use With Transmitter/Receiver

ElPaso TubeAmps

Collins R-390a dial calibration zero set demo

R390A Break-in Relay Repair

Reassembling R-390A

Steve Ellington N4LQ

R-390A Receiver Testing

Steve Ellington N4LQ

Collins R-390A /URR receiver No 2

Hacking the R-390A to Transcieve SSB

Gregory Charvat

Collins R-390A/URR tuning units

EAC R-390A /URR Radio Receiver

R390A KS1U Part 1

Synchronizing a Mil wrist watch to WWV using an R390A receiver

Gregory Charvat

Collins R390A Video #4 - IF Gain Adjustment R519

Jim's Radio Shop

Collins R-390A radiation testing

R-390A Basic Repair and testing