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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.
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 improvements - Dash Dist
http://www.dashdist.com/1u2u/R-390A/improve/improve.php
The "Oven" switch should be kept turned off whenever the R-390A is operated below the artic circle. The Audio-module. The audio-module has four tubes which can be eliminated with a solid-state conversion. Two of these tubes are 6AK6s, which generate a lot of heat. The audio-module sits physically underneath the IF-module.
Mods for Collins R390A
http://www.redwaveradio.com/11_d897569a063558ff_1.htm
The audio on either R-390 or 390A is horrible. You have two options, modify the audio or use the diode load output (#14 on the rear terminal strip) and connect to a good outboard audio amp. The second option is generally the easiest if you have an amp available and will yield excellent audio.
THE R-390 COOKBOOK - r-390a.net
http://r-390a.net/r-390_cookbook.pdf
The R-390 receiver has two (2) audio channels, LOCAL AUDIO and LINE AUDIO with seperate gain controls for each channel. 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.
Chapter 11 – Upgrades, Modifications, Parts ... - r-390a.net
https://www.r-390a.net/Y2K-R3/11_Chapt_11.pdf
Capt. Lee’s Product Detector For The R-390/ R-390A – Revisited 31 AGC and Limiter mods 35 High-gain Product Detector 36 R-390A Upgrading: Panel and Frame 37 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 390 Receiver for sale | eBay
https://www.ebay.com/b/R-390-Receiver/4673/bn_7023238118
The R-390A Owner's Manual - AM Window
http://www.amwindow.org/tech/htm/r390man.htm
The R-390A Owner's Manual. The R-390A Owners Manual. by. Chuck Rippel, WA4HHG. Congratulations! You are the proud owner of a Collins designed R390A/URR general coverage, HF radio receiver. In many circles, the R390A is considered to be the finest HF radio receiver ever built. Weighing in at 85 lbs, this electro-mechanical wonder was designed in ...
HF Receivers – Fair Radio Sales
http://fairradio.com/catalog/category/alphabetical-category-listing/hf-receivers/
*R-390A Test Connector set of five pairs to make test extender cables for R-390A receiver. 5 male/female connector pairs with covers to make the following extender cables: P110-J410 (Crystal Osc), P108-J208/P109-J709 (RF Amplifier/VFO), P111-J8111/P119-J619 (Power supply/Audio), P120-J620 (Audio), P112-J512 (IF Amplifier); with wiring instruction sheet from …
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