[R-390] Audio Capacitance

[Flowertime01 at wmconnect.com]

Barry,

Audio Capacitance,
Are you sure you have enough ear to discern the lower lows?
Did you get all the caps in the chain from the detector to the output?
If you missed one then that one is still limiting the lows.
Get the cathode by pass caps also. These will keep you from hearing a 
difference.
Does your speaker or headphones have enough low end to enable you to discern 
the difference? Your R390 may have more bottom end than the speaker or headset 
or ears can reproduce.

Why do you believe the signal you were hearing has any more bottom end to 
hear?

Do not be deceived easily. Stay with it and review what going on in your 
receiving environment. There may be more low frequency than before, I just may not 
be as overwhelming as you expected. You are not going to get a boom box out 
of a 1/2 watt audio amp. Work with your BFO against a CW signal generator and 
listen for an improved lower audible frequency as you zero beat the BFO. 

Big caps is better sound for sure. Many or have been there and done 
something. Those that have stay with it long enough to get all the items changed are 
happier with the sound.

Caps in parallel all add up to a simple sum. You are better off just doing a 
replacement. Things are not critical in the audio deck. Your not likely to 
send it into oscillation by doing cap replacement. The new caps are so much 
smaller you can do the whole deck with some 450 or 600 volt caps in some .1 or .3 
values in place of the .01 values. Find the 8uf and put a 20 or so in there. A 
low voltage elec will be OK.

Roger KC6TRU