Debate on Eddie's Plexi

YMI5150? · Post by **YMI5150?** » Thu Jul 29, 2010 8:35 pm

StuntDouble wrote:ok, you loose some gain with the 470uf cap paralleled with the .68/820k. I doubt Ed ever did it, but bumping up the value of the output coupling caps and lifting the V2 cathode resistor and connecting it to a 2.5k pot is awesome ; I took my 250uf electrolytic off and dialed in the bass I needed at the pot...perfect!You get the VH1 level of gain and bite with some added ooomph in the low-end. Guys, this is sick; you've gotta try it!!!

I may have to. Intrigued for sure. especially if we agree that's what the white knob was for.

StuntDouble · Post by **StuntDouble** » Thu Jul 29, 2010 8:43 pm

YMI5150? · Post by **YMI5150?** » Thu Jul 29, 2010 8:56 pm

i like the idea of a trim pot on the board. I think once its dialed its done. agree? be nice to get the resistive value of your pot set where you like it.

YMI5150? · Post by **YMI5150?** » Thu Jul 29, 2010 10:30 pm

since this thread has sorta turned into how to make your amp sound like Eds...jumping channels is another way to adjust bass. I just spent some time noodling and jumping gives you worlds of tone choices. Man I love this amp...

seriously though, I'm surprised ed didn't jump the channels inside the box.

StuntDouble · Post by **StuntDouble** » Thu Jul 29, 2010 10:52 pm

vanhalen5150 · Post by **vanhalen5150** » Thu Jul 29, 2010 10:58 pm

YMI5150? wrote:since this thread has sorta turned into how to make your amp sound like Eds...jumping channels is another way to adjust bass. I just spent some time noodling and jumping gives you worlds of tone choices. Man I love this amp...

seriously though, I'm surprised ed didn't jump the channels inside the box.

StuntDouble · Post by **StuntDouble** » Fri Jul 30, 2010 1:36 am

vh junkie · Post by **vh junkie** » Fri Jul 30, 2010 4:12 am

Can you give is shot of one of those laid across the circuit board. I would give us a better idea if the one's on Ed's board were .022... or larger...

vanhalen5150 · Post by **vanhalen5150** » Fri Jul 30, 2010 8:31 am

Rats!!!! I knew that package looked familiar......

http://cgi.ebay.com/ELMENCO-MYLAR-PAPER ... 0197448137" onclick="window.open(this.href);return false;

StuntDouble · Post by **StuntDouble** » Fri Jul 30, 2010 11:09 am

hahaha.

ok, I'll stick one in my metro after work.
EDIT: I looked at some more pics of the old Arco Buffer caps, and I think Ed's is a .0022uf, but is larger because it's a higher coltage rating. The .0022 1600vdc Arco/Elmenco buffer caps are big...did I mention these were common in late 60's Bandmasters?

rgorke · Post by **rgorke** » Fri Jul 30, 2010 12:15 pm

I don't know, I put a 330uf with a .68 on V2 and it was a mub bomb beyond belief. Maybe because I have .1s in the outputs?

I love the spec I have now, I should just leave it alone.

StuntDouble · Post by **StuntDouble** » Fri Jul 30, 2010 12:57 pm

tubetramp · Post by **tubetramp** » Fri Jul 30, 2010 10:27 pm

i hate to pop a hole in this but it was a regular old 68 plexi that got blowed up alot of times. i saw that amp smoke the whole jewish temple in altadena in 1972 ...the power transformer melted all the paper to a cinder ,i will never forget it. ed had a fuse problem ,being a 17 year old genius in electronics he put tin foil on it. ...the marshall was gone thru by aeolians music . another transformer of the same type was put in thats all i know. then hose got a hold of it . end of story

StuntDouble · Post by **StuntDouble** » Fri Jul 30, 2010 11:23 pm

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