[Fwd: Re: [R-390] 390A audio]

[William A Kulze]

Apparently I'm not paying enough attention to the address line. Ooopsy

---------------------------- Original Message ----------------------------
Subject: Re: [R-390] 390A audio
From:    "William A Kulze" <wak9 at cornell.edu>
Date:    Thu, October 4, 2007 9:36 am
To:      "Rasputin Novgorod" <priapulus at yahoo.com>
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> 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?
>
> I've read about the cap mods.
>
> Sincerely
> /b
>

I know this is quite late, I'm WAY behind in reading my mail.

I have gotten good sound also with the cap/resistor coupling to a good
amp. I have a question for the group and a comment for Rasputin.

First the comment, if you are hooking a speaker directly to the audio out
terminals, definitely get a 600ohm to 8ohm xfmr. I think I burned my
original output xfmr out way back when before I learned that. Might as
well have shorted the output.

The question, Is it acceptable to use 2 electrolytics back-to back to
create a non-polarized electrolytic? If I remember correctly, the method
calls for non-polarized and I did the back-to-back before getting one. And
does it matter which legs tie together?

Thanks, Bill