Bias Trim Pot

JimiJames · Post by **JimiJames** » Fri Aug 14, 2009 6:42 am

When were the "slider" style introduced/ used ?
I don't see' em all that often in Plexi's...

jbzoso2002 · Post by **jbzoso2002** » Sat Aug 15, 2009 2:51 pm

I may be wrong but I think they were added
later to amps that came with no bias adjustment.

GO BEARS!!

Jimmy

JimiJames · Post by **JimiJames** » Sat Aug 15, 2009 5:19 pm

o.k. kool. I see, thanks, man.
the reason I'm asking is that just recently I'm seeing these in Plexi's.
I see the tall thin standup trim pots often and when I seen these sliders I just had to ask...
When you say later...when ?

Da BEARS my frent !
All da way to da Suuuuper Bowl. Where da final score will be da Bears two hunnert and tree to negatiff two, my frent. Dis will be possible only if Coach Ditka were allowed to play with only one udder player... Michael Jordan of Da Bullsss. DA BEARSSSSS !

jbzoso2002 · Post by **jbzoso2002** » Sun Aug 16, 2009 12:13 am

When I say later is after the amps were made
with just a resistor that had to be changed
to adj the bias. A mod was done to put a slider
pot to adj the bias.

I think.

BEARS, DITKA, DA BEARS.

Jimmy

JimiJames · Post by **JimiJames** » Sun Aug 16, 2009 5:32 am

yep. o.k. this I know...
ehh, but, this is not what I'm asking.

Have a looksee,

Marshall jtm 45 plexi original c.1966

1969 Marshall Plexi 100 Watt Super Lead

50W Marshall Plexi 4X10 Big Box Bluesbreaker

jbzoso2002 · Post by **jbzoso2002** » Thu Aug 20, 2009 2:08 pm

Those are what I was thinking too but
maby they did come that way.

To this I must say I dont know.

And then this.......BEARS!!

Jimmy

Polytone · Post by **Polytone** » Mon May 23, 2016 3:49 pm

Yeah, I have one of these in my Plexi SB -68. Looks to be original to me. By the way, the PPIMV in the picture is gone now.

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