Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Stuff4bikes on May 19, 2022, 09:35:36 pm

Title: Hoffman plexi 50 questions
Post by: Stuff4bikes on May 19, 2022, 09:35:36 pm

The layout shows all the can caps grounded together.......
I am one of the few people who does not like can caps....
And I have dozens of 47uf 500v caps on hand.....
I am going to use a single 100uf and 4-47uf's in
A fender(ish) dog house alignment...underneath the amp though..

How far away do you keep the impedience selector switch from the filter caps...?
Should I ground all the caps together or A,B,C grounded together and D,E grounded seperate?
I ordered a faceplate from modulus and it will have 4 holes for the inputs, the layout only
Calls for 2.
Can I just parralel another input jack for each channel?

Title: Re: Hoffman plexi 50 questions
Post by: EL34 on May 20, 2022, 07:15:17 am

Ground diagram from the library page is here
https://el34world.com/charts/grounds.htm

Title: Re: Hoffman plexi 50 questions
Post by: sluckey on May 20, 2022, 08:15:52 am

Quote from: Stuff4bikes on May 19, 2022, 09:35:36 pm

Can I just parralel another input jack for each channel?

The schematic shows how to wire dual input jacks.

Quote

How far away do you keep the impedience selector switch from the filter caps...?

Somewhere between 1/4" and 1/4 mile.

Title: Re: Hoffman plexi 50 questions
Post by: Williamblake on May 20, 2022, 08:27:50 am

Quote

How far away do you keep the impedience selector switch from the filter caps...?

Somewhere between 1/4" and 1/4 mile.
[/quote]
Just dont go metric.

Title: Re: Hoffman plexi 50 questions
Post by: Stuff4bikes on May 20, 2022, 08:54:42 am

Thanks for all your help.