Echoplex EP-3 22VDC Preamp Schematic

[robthequiet]

I'd settle for knowing which MPF

Duh. Learning to read. MPF102 it is.

[pinkjimiphoton]

sounds to me like he just copied the ep3 schematic, and added a charge pump to a phone charger to run it.

there's stuff here:

https://www.google.com/search?q=22+volt+echoplex+ep3+preamp+schematic&ie=utf-8&oe=utf-8

second pic here is the pre isolated

https://www.google.com/search?q=echoplex+preamp+schematic&sa=X&biw=1366&bih=585&tbm=isch&tbo=u&source=univ&ved=0ahUKEwiztvP0lPfTAhVj6YMKHYAzCWQQsAQIJg#imgrc=vCCKciOe_FzokM:

http://s487.photobucket.com/user/japanstrat/media/EP3.jpg.html

on tagboard is a layout for the ep3 pre with a charge pump, too.

[robthequiet]

Gotcha. I'm noticing that the 22V supply puts the OEM FET pretty close to the limit as far as the specs -- noting for the purpose of figuring out a replacement and which parameter matters. Without having a live working EP3 to test against it's kinda shooting in the dark. 'course, some of my best shots were in the dark 

[pinkjimiphoton]

hahhah, i just checked the other thread plexi, forgive me mate

you're way beyond this already

rob, i have a live, working ep3.... what do ya need to know?

[robthequiet]

Well, I guess how the feel and sound works vs. some of these clones. I got apps on my phone that sound cool but the feel is totally off. Youtube helps, especially Pete Thorne's demos cuz he knows recording, but there it is. Thnx, man!!

[Plexi]

Thanks Rob and Pink Jimi!

I'm dealing now of understand a simple way to bias a Jfet...