Metropoulos Forum

Just about finished wiring up my first Plexi 100 project ..just wondering why some of you have grounded the Vol/Treble/Pres, etc pots to themselves (just like you do in your guitar) in addition to the ground bus??

I wouldn't bother doing that. Consider looking into the "Larry ground" method.

"Larry Ground" all the way.

kewl..I'll check it out...in the mean time, gonna do the first power-up tests this weekend...fire in the hole

Sparky4444 wrote:kewl..I'll check it out...in the mean time, gonna do the first power-up tests this weekend...fire in the hole

Not yet! Unless your caps are relatively new, you should "form" them first before firing up that amp for the first time. Lots of instructions on this as well here at Metro.

they are brand new...I got my Dad supervising this project -- he's been doing this for years....should be fine...I hope

ok....marginal success....nothing blew up! ...but..

...not getting the power it should...so gotta back-track on my soldering job....also, something is not grounding right as there is too much hum...I can't find a diagram of the Larry grounding method...can someone provide me the link??

found it...

...so run a ground all the way from the inputs to the PT?? Thick house-wiring copper or just the same smaller gauge??

Can you please post the link here ? I have not found a diagram...

Message me your email and I'll send you the image...

...So did the work-over on the grounding and it's working now...amp is damn loud! woo hoo...still gotta touch up some of the grounding tips but she's enroute now...

..I'll post some clips soon on new thread as soon as she's spit-n-polished up...