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The R-390A Owner's Manual - AM Window
http://www.amwindow.org/tech/htm/r390man.htm#:~:text=Make%20sure%20your%20R390A%20has%20a%20good%20electrical,ohm%20loudspeaker%2C%20it%20will%20sound%20weak%20and%20distorted.
THE R-390 COOKBOOK
http://r-390a.net/r-390_cookbook.pdf
The output impedance of each channel is 600 ohms. 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.
Collins R-390 Audio Output Impedance Matching | radiodx.com
https://www.radiodx.com/articles/technical/equipment/collins-r-390-audio-output-impedance-matching/
Collins R-390 Audio Output Impedance Matching. This link takes you to a page where Dallas Lankford describes how to match the venerable R-390 receiver. Share this: Share; Leave a Reply Cancel reply. Your email address will not be published. Required fields are marked * Comment *
Collins Radios -- Collins R-390 and 390A Receivers
http://www.radioing.com/collins/rx08.html
Description: The R-390 receiver was originally designed by Collins Radio Company for military and government applications. The receiver was later re-designed as the R-390A/URR in order to reduce the number of tubes and to improve selectivity through the use of mechanical filters.
The R-390A Owner's Manual - AM Window
http://www.amwindow.org/tech/htm/r390man.htm
Make sure your R390A has a good electrical and RF ground. The audio output of this receiver is much like most other military receivers having a 600 ohm impedance. This means, if connected to a regular 8 ohm loudspeaker, it will sound weak and distorted.
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