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Hoffman Amps Forum image Author Topic: POTS IN BLUES JR  (Read 623 times)

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Offline BLUESMAN-2

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POTS IN BLUES JR
« on: December 17, 2025, 10:30:54 pm »
Would someone please answer my questions.

the pots in a bj that are labeled 1ma, does that stand for 1 meg ohm ? And the other pots labeled 50kl and 250 kl -- does kl stand for kilo ohms.

And is there a point to point labeled layout for the components on the turrent board?

I would not have purchased the conversion kit if I had known I would have to research for hours and to just find pieces of information.
Thank you,
Blues man

Offline AlNewman

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Re: POTS IN BLUES JR
« Reply #1 on: December 17, 2025, 11:16:15 pm »
1MA would be 1 meg ohm audio taper.
50kl, or 250kl would be 50/250 kilo ohm linear taper.

There should be a layout, if you bought a conversion package.

Of course there's lots of schematics for the blues junior, and Hoffman's website has layouts for his conversion, is that where you purchased yours?

Offline AlNewman

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Re: POTS IN BLUES JR
« Reply #2 on: December 17, 2025, 11:20:20 pm »
https://el34world.com/Hoffman/files/Hoffman_BluesJunior.pdf

Here's the page for the Hoffman layout/schematic I found, if that's the one you bought?

Offline SEL49

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Re: POTS IN BLUES JR
« Reply #3 on: December 17, 2025, 11:23:58 pm »
Would someone please answer my questions.
Are you asking specifically about Hoffman's Blues Junior conversion?

Quote
the pots in a bj that are labeled 1ma, does that stand for 1 meg ohm ? And the other pots labeled 50kl and 250 kl -- does kl stand for kilo ohms.
1ma means 1meg audio taper pot. 50kl means 50KΩ linear taper pot. 250kl means 250KΩ linear taper pot.

Quote
And is there a point to point labeled layout for the components on the turrent board?
Yes. See page 1 of the Blues Junior pdf.

Quote
I would not have purchased the conversion kit if I had known I would have to research for hours and to just find pieces of information.
Hoffman does not provide "paint by numbers" kits. A certain level of electronics knowledge and experience of tube amp theory and building techniques is required to be successful with a Hoffman "kit".


Offline BLUESMAN-2

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Re: POTS IN BLUES JR
« Reply #4 on: December 18, 2025, 12:24:30 am »
THANK ALL OF YOU GUYS FOR HELPING.
I WILL ALSO BE OF HELP TO OTHERS.

 


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