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Treetop Circuits Owner’s Manual for SB-390 SSB Adapter ...
http://www.treetopcircuits.com/docs/SB390Manual.pdf#:~:text=In%20an%20R-390A%3A%20Connect%20the%20red%20wire%20to,Do%20not%20change%20the%20other%20connections%20on%20V506.
audio deck page 1 - r-390a.net
http://www.r-390a.net/audio_deck.pdf
Subject: [R-390] 390A Limiter Mod I found the limiter mod I was looking for, and so here is the relay requested by some of you. Credit KD0HG and Electric Radio #70. Symptom: The limiter adds audio distortion even at its lowest setting. Solution: Install a 33K 1/2 W resistor in series with R527 (390A) or R539 (390).
R-390A Audio Modifications - amwindow.org
https://www.amwindow.org/tech/htm/32vac.htm
R-390A Audio Modifications. by. Chuck Rippel, WA4HHG . In troubleshooting my 32V-3, a condition occurred which bears repeating as a warning to other owners of Vintage Equipment. However, I am not an electrician so check your local situation and codes before proceeding at your own risk. My 32V-3 was blowing HV power fuses due to an internal short.
R-390A MAINTENANCE COURSE - Navy Radio
https://www.navy-radio.com/manuals/r390a-maint-ct-school.pdf
MATING OF PLUGS AND JACKS Locate J-518 on the R-390A. Normally, you would expect P- 518 to connect to this jack. What is the number of the plug connected to J-518? 1.Note that the last two digits match ...
R-390A Rebuild
https://www.radioblvd.com/R-390A%20Rebuild.htm
R-390A uses 26 tubes (including the 3TF7 ballast tube) with one RF stage, four IF stages, mechanical filters on four of the six selectivity positions, plus an 800Hz audio filter. When properly set-up, an operator can dig right through the QRM while maintaining fantastic sensitivity making the R-390A one of the finest
THE R-390 COOKBOOK - r-390a.net
http://r-390a.net/r-390_cookbook.pdf
The LINE AUDIO channel is intended to be used as a balanced audio line. The LOCAL AUDIO channel is to be used for speaker and headphones. The R-390 receiver does not have a self-contained speaker. Therefore, it Is necessary to provide an external speaker. Most speaker impedances are low, typically14.to 16 ohms.
The R-390A Owner's Manual - AM Window
http://www.amwindow.org/tech/htm/r390man.htm
Number 32-1031) and connect the primary terminals marked "C" and "10" to terminals 6 and 7 on the left hand terminal block located on rear of the R390A. Then, connect the secondary side of the transformer, terminals "8" and "C" to your 8 or 4 ohm speaker. This will result in an 500 to 8 ohm match which will give good performance.
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