[R-390] R-390A IF and AGC

[D. ball]

Hello all.

I have been having great success by using the IF section of a SSB CB to 
demodulate the RF coming from the 390A�s IF out. I cannot say how much fun 
it was to do this and watch it work so well. I can also feed the audio back 
into the 390 by using the diode out. Now that I can hear SSB much better 
than the product detector mod someone installed I am considering reversing 
the mod to stock.

Question 1: Does anyone think a tube diode makes for better AM audio than a 
diode?

The other is the ACG mods.

Question 2: Would the stock AGC work better when the radio is used as a down 
converter rather than the typical AGC mods found in these radios? The CB has 
it�s own AGC in the IF stage.


On another note I removed a scary mod in the audio section. Someone had used 
a line transformer as a plate transformer!!!!.. Did this guy know anything 
about voltage ratings?
I removed that mod quickly and lucky there was no damage due to the mod. The 
old caps were replaced with new ones for safty and all works well. I bought 
a 500 to 4 ohm transformer and installed it in the speaker. No need to mount 
a transformer on the back of the radio.

thanks
Joe
KE1MB

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