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JSB1685
10-31-2016, 08:28 AM
Hi everyone,

I write from Italy, because I'm looking for an original volume potentiometer for my JBL SG520 preamplifier. Could anyone help me? Thank you very much and kind Regards.
Alessio

Flodstroem
10-31-2016, 04:06 PM
Hello Alessio!

Down under you could see a link to a service manual for the SG520 (once I owned a SG520 too).
Look at the line amp in the end of the manual. It says 10 kohms included a tap for loudness.
You will also find part number for this vol control including part numbers for everything else in the amp.
I doubt the slide potentiometer are still available, that amp is approx 48 years old (the service manual
are from 1968 :blink:

http://www.jblproservice.com/pdf/Vintage%20JBL-UREI%20Electronics/JBL-SG520.pdf

JSB1685
10-31-2016, 04:42 PM
Hello Alessio!

Down under you could see a link to a service manual for the SG520 (once I owned a SG520 too).
Look at the line amp in the end of the manual. It says 10 kohms included a tap for loudness.
You will also find part number for this vol control including part numbers for everything else in the amp.
I doubt the slide potentiometer are still available, that amp is approx 48 years old (the service manual
are from 1968 :blink:

http://www.jblproservice.com/pdf/Vintage%20JBL-UREI%20Electronics/JBL-SG520.pdf


Hi Flodstroem, thank you!
My SG520 already has a volume potentiometer, but it isn't the original one; so I'm looking for a used or NOS one. :)