Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: labb on July 10, 2016, 08:28:28 am

Title: Hoffman grounding scheme question.
Post by: labb on July 10, 2016, 08:28:28 am

Looking at the Hoffman grounding drawing...Where does the buss that goes down the back of the pots and  the pre amp grounds, the input jacks and the pre amp e-caps connect to attach to a  ground lug.

Title: Re: Hoffman grounding scheme question.
Post by: sluckey on July 10, 2016, 08:40:08 am

There's not a separate wire that connects to chassis. The input jacks provide a good chassis ground for that buss. In fact, if you solder that buss to the back of the pots like Hoffman does, then each pot body also provides a chassis ground connection.

Title: Re: Hoffman grounding scheme question.
Post by: labb on July 10, 2016, 08:51:41 am

Thanks Sluckey. That is what I thought but just need a little hand holding. I ground mostly the same way except that I run a bus wire (not attached to the back of the pots) and ground it on a lug right at the input jacks. Other thing that I do is ground the mains on a lug by its self...By the way, Hope you know that us amateurs really appreciate having folks like you to bail us out when we really mess things up.

Title: Re: Hoffman grounding scheme question.
Post by: sluckey on July 10, 2016, 09:08:43 am

Quote

I ground mostly the same way except that I run a bus wire (not attached to the back of the pots) and ground it on a lug right at the input jacks.

That's exactly what I do also.