Selmer Treb n bass Mk11 presence help !

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Selmer Treb n bass Mk11 presence help !

Postby bobster on Mon Aug 01, 2016 10:08 pm

Hi guys ,
similar to LD50s post below i also have a 1965 selmer t&b mk11.
its a great amp but apparently the 'presence' circuit is hardwired and possibly at the harsh end of the spectrum.....
when i got it my amp had a hole drilled on back for some sound to light nonsense which i took out years ago....
im wondering about installing a presence pot in this hole and wiring it to the circuit board but need some advice to see if im barking up the right tree ;)

would i be right in saying that the presence resistor is a 100k which is wired from the speaker output jacks?

would i be in the ballpark if i removed this resistor and ran two wires from where it was to the lugs one and two of a 100k pot with its third lug grounded?

any advice much appreciated!
thanks bob
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Re: Selmer Treb n bass Mk11 presence help !

Postby bill bokey on Tue Aug 02, 2016 8:55 am

No, the 100k from the output jack is the NFB resistor. The presence is a 4k7 resistor across a 100nF capacitor. Remove the resistor and replace it with a 5k lin pot ;)
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Re: Selmer Treb n bass Mk11 presence help !

Postby pdf64 on Tue Aug 02, 2016 10:55 am

My band:-http://www.youtube.com/user/RedwingBand
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Re: Selmer Treb n bass Mk11 presence help !

Postby bobster on Tue Aug 02, 2016 5:37 pm

thanks gentlemen ! i see it now..
much appreciated ;)
:jam:
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