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Hoffman Amps Forum image Author Topic: JTM45 build  (Read 2815 times)

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Offline Tiny_Daddy

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JTM45 build
« on: March 16, 2011, 10:45:10 pm »
I got a chassis and faceplates from Tube Depot for JCM45. The chassis and faceplate together measure just over 1/8 inch. I also have the usual sort of amp pots that are sold by Alpha and CTS these days. Problem is the bushings are too short for 1/8 inch panel. The bushings just barely make it through the panel and I suppose you could cram a nut on, but there is no way to add a lockwasher, even a thin one. Is someone selling pots with longer bushings?
Or should I cut larger holes in the faceplate?
« Last Edit: March 17, 2011, 07:46:01 am by Tiny_Daddy »

Offline bluesbear

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Re: JTM45 build
« Reply #1 on: March 17, 2011, 07:37:44 am »
"Or should I cut larger holes in the faceplate?"

I had a Fender Super Champ Fender had done this way.
Dave

Offline jerrydyer

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Re: JTM45 build
« Reply #2 on: March 17, 2011, 11:02:09 am »
all the alphas 3/8 I buy have room to spare. hhhmmm? I think my chassis are the same thickness.

Offline sluckey

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Re: JTM45 build
« Reply #3 on: March 17, 2011, 11:32:43 am »
The 24mm Alpha pots have a 3/8" diameter bushing that is 1/4" long. Won't that work in a 1/8" thick panel and still allow for the nut and washer supplied?
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline Tiny_Daddy

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Re: JTM45 build
« Reply #4 on: March 17, 2011, 11:53:18 am »
I want to add a lockwasher to prevent rotation. Preferably the thick lockwashers that Fender uses. I see pictures of Bourns showing a longer bushing so I have ordered some.

 


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