Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: taylorc315 on December 21, 2015, 04:10:49 pm

Title: 100 watt plexi cap wiring
Post by: taylorc315 on December 21, 2015, 04:10:49 pm

Does anyone have pics of how the caps in 100 watt hoffman plexi are wired? Having trouble as to where on the board they all go. Thanks

Title: Re: 100 watt plexi cap wiring
Post by: EL34 on December 22, 2015, 05:05:42 am

Hi, you  need to post in the correct board
I'll move you pots to the correct board

Title: Re: 100 watt plexi cap wiring
Post by: sluckey on December 22, 2015, 07:01:55 am

Quote from: taylorc315 on December 21, 2015, 04:10:49 pm

Does anyone have pics of how the caps in 100 watt hoffman plexi are wired? Having trouble as to where on the board they all go. Thanks

The caps are probably not actually mounted on the Hoffman board. Some of them 'may' be located along the edge of the board. You'll have to work with both of these drawing...

     http://el34world.com/Hoffman/images/Plexi100Old.gif (http://el34world.com/Hoffman/images/Plexi100Old.gif)
     http://el34world.com/charts/images/M100.gif (http://el34world.com/charts/images/M100.gif)

Marshall used six 50/50 cap cans. Five of the cap cans have the two 50µF sections connected together to get 100µF total. This makes for a very tidy layout. Here's a layout that shows that style. The board is different from the Hoffman board so you would have to adapt.

     http://sluckeyamps.com/misc/2203_MV_Layout.pdf (http://sluckeyamps.com/misc/2203_MV_Layout.pdf)

Title: Re: 100 watt plexi cap wiring
Post by: taylorc315 on December 22, 2015, 10:36:48 am

Thanks Sluckey, That's what was confusing me, the amount of caps used in this build and which ones that needed to be connected together.