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R-390A Audio Mods - AM Window
http://www.amwindow.org/tech/htm/r390aud.htm
R-390A Audio Modifications. by. Chuck Rippel, WA4HHG Some of you may know that I restore R390A receivers as a hobby. Here is an easy "soft " (reversable) modification which I came up with that really improves the R390A audio by mellowing it out a bit. The audio tubes, V602A and V603 are coupled with 300V, .01mfd "Vitamin Q" type capacitors.
R-390A Rebuild Audio Module - Dash Distributing
http://www.dashdist.com/1u2u/R-390A/Audio/Audio.php
Externally, you can't tell that the R-390A's Audio-module has been changed. The R-390A simply sounds better and works better. The squelch function, that was included in the R-390A's original design but omitted from its production, is included in my conversion because it required only a few, inexpensive components.
PRIME Z390-A｜Motherboards｜ASUS USA
https://www.asus.com/us/Motherboards-Components/Motherboards/PRIME/PRIME-Z390-A/
Prime Z390-A utilizes a unique audio codec designed in close collaboration with Realtek — the Realtek S1220A. It also features an unprecedented 120dB signal-to-noise ratio for the stereo line-out and a 113dB SNR for the line-in, providing pristine audio quality. Additionally, a new impedance-sensing circuit automatically adjusts gain to ...
R-390A Rebuild
https://www.radioblvd.com/R-390A%20Rebuild.htm
A Brief History of the Design. R-390/URR - Arguably, the R-390/URR and its later kin, the R-390A/URR, are the ultimate tube-type receivers. The first version of this incredible receiver was the R-390 featuring 33 tubes (includes the 3TF7 ballast tube,) double or triple conversion, two RF stages, six IF stages, modular construction, three audio filter settings, six selectivity …
R-390A Audio Modifications - Amfone
http://amfone.net/Amforum/index.php?topic=32869.0
R-390A Audio Modifications by Chuck Rippel, WA4HHG Some of you may know that I restore R390A receivers as a hobby. Here is an easy "soft " (reversable) modification which I came up with that really improves the R390A audio by mellowing it out a bit. The audio tubes, V602A and V603 are coupled with 300V, .01mfd "Vitamin Q" type capacitors.
Chapter 11 – Upgrades, Modifications, Parts ... - r-390a.net
https://www.r-390a.net/Y2K-R3/11_Chapt_11.pdf
R-390A Upgrading: Audio Modifications by Chuck Rippel, WA4HHG 38 R-390A Upgrading: IF Sub-chassis 40 R-390A Upgrading: RF Amplifier Sub-chassis 40 R-390A Upgrading: Power Supply Sub-chassis 41 R-390A Upgrading: Tube Shields 41 R-390A Upgrading: Tubes 41 R-390A Upgrading: Inrush Current and MOV FAQ 42 ...
R 390 Receiver for sale | eBay
https://www.ebay.com/b/R-390-Receiver/4673/bn_7023238118
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