[R-390] 390A audio

[Bob Camp]

Hi

Electrolytics of any sort are not a real good idea on the diode load  
test point. They leak, and the leakage current can drive the radio a  
little nuts. A 0.1 uf ceramic bypass capacitor is a reasonable  
choice. A 1 uf plastic (mylar or what ever) cap would be better, but  
low leakage comes first and then larger values.

Bob

On Sep 3, 2007, at 2:53 PM, Rasputin Novgorod wrote:

> Hi All:
>
> Thank you for all your excellent advice. I followed
> the r390a.com directions, and it works well. The only
> capacitor I could find that was big enough was a
> 10uf 15v electrolytic ~polarized~. It hasn't exploded
> yet with this low level audio; should I replace it?
>
> I'm amazed at the wealth of resources for my radio.
> I've spent the entire long weekend reading, and hardly
> scratched the surface.
>
> Sincerely
> /b
>
> find any
>> http://www.r390a.com/html/diode_load.html
>>
>>> I'm not very happy with my audio. I'm no expert at
>>> this, but looking at the schematic, I wonder if I couldn't
>>> pickoff low level audio from the "Diode" pin 14 at the
>>> back panel and feed it to an external high impedance input
>>> audio amplifier & speaker?
>
>
>
>
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