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Antique Radio Technical Forum
Potentiometer Replacement

Posted by Lewis L on 04/27/2009 16:56

::Sorry for the lack of info - it's a Grunow 660. This is for the volume control and not the tone because the radio already has a separate tone control. Ed's right - I need to determine if this is indeed a linear taper or an audio taper. I assumed it was linear but could very well be wrong. But it sounds like planigan's idea would be worth trying. I am getting a fixed resistance from that tap of about 230k from the 0 ohm terminal.
:Now that I've seen the schematic, I can tell you that the tap is for loudness control, that is, the ear hears frequencies at different volume levels. You will need a log pot, and if there is not a tap, you probably will not ever notice the difference. But if you are like me, you will want a one meg pot with a loudness tap. Not an uncommon animal.

OOps, meant to say: the ear hears frequencies differently at different audio levels.

Potentiometer Replacement 
Steve Bento 04/24/2009 13:17 
Marv Nuce 04/24/2009 20:08 
Dave A. 04/24/2009 20:56 
Steve Bento 04/25/2009 13:25 
Marv Nuce 04/25/2009 17:50 
Lewis L 04/25/2009 18:47 
Dave A. 04/25/2009 19:27 
Dave A. 04/25/2009 19:34 
planigan 04/25/2009 22:48 
Marv Nuce 04/26/2009 01:03 
Edd 04/27/2009 14:15 
Steve Bento 04/27/2009 15:29 
Lewis L 04/27/2009 16:54 
Lewis L 04/27/2009 16:56 
planigan 04/27/2009 18:05 

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