a trainwreck preamp inside a plexi spec

rockstah · Post by **rockstah** » Tue Sep 16, 2008 8:02 pm

here is a clip of it. its pretty wicked.

http://www.soundclick.com/bands/page_so ... ID=6896334

Mark

Richie · Post by **Richie** » Wed Sep 17, 2008 1:18 am

sounds like its alive

Trigger · Post by **Trigger** » Wed Sep 17, 2008 2:15 am

Sounds a little more throaty than your Express. I love that sound. Keep the clips coming.

rockstah · Post by **rockstah** » Wed Sep 17, 2008 7:10 am

Plexi spec with express preamp voltages

B+: 403DCV
Bias: 43MA

V1
Pin1 188
Pin2
Pin3
Pin6 211
Pin7

V2
Pin1
Pin2
Pin3
Pin6 269
Pin7

V3
Pin1 211
Pin2
Pin3
Pin6 202
Pin7

Post by **HeeBGB** » Wed Sep 17, 2008 3:43 pm

Dude that is killer! What speakers are you using?

rockstah · Post by **rockstah** » Wed Sep 17, 2008 7:32 pm

early 90's england made green backs in a 76 marshall straight cab.

Richie · Post by **Richie** » Wed Sep 17, 2008 8:09 pm

I listened to all your clips, very informative. Out of all the amps and clips you have, which are your top 3 faves. I know some are plexi,and modded,to 2203 etc.. But i'm sure you may have a couple favorites,or combinations of speakers with a certain amp.

rockstah · Post by **rockstah** » Thu Sep 18, 2008 2:48 am

[IMG

354]http://i24.photobucket.com/albums/c44/m ... ematic.gif[/img]

roberto · Post by **roberto** » Fri Sep 19, 2008 1:06 am

Rockstah, great sample!! I've posted an idea about trainwrecking a 1959 on MetroAmp and a single tone pot version here about last may, but never had time to try them because I'm on retroengineering a SRV SLO. glad to see you've got the same idea and you have realized it!
What about power supply? What are differencies on different 2ns stage load values 2n2-150k? Have you tried wiring two triodes of V2 in parallel with 47k and 4k7 resistors?

Thanks!!

Lousyatit · Post by **Lousyatit** » Fri Sep 19, 2008 7:15 am

WOW, really vicious sounding !!!

Brad737 · Post by **Brad737** » Sun Sep 28, 2008 5:09 pm

I love it. I remember thinking about marrying my two favorite amps together about a year ago. But I simply wouldn't have the first clue how to do it. Awesome job, Mark.

Roe · Post by **Roe** » Mon Sep 29, 2008 5:20 pm

try running a 16ohm cab into the 8 ohm output!

roberto · Post by **roberto** » Sun Oct 12, 2008 8:18 pm

Rockstah,
can you try this two pot eq+gain on the trainwrecked plexi?
I'm curious about how it works on this kind of amp, but by now I've no time to build a complete amp just to try this.

Thanks!

roberto · Post by **roberto** » Sun Oct 12, 2008 8:25 pm

It's an old idea I had last winter. I've found some simulations about it (frequency response on eq pot settings):

jimistheman · Post by **jimistheman** » Sat Oct 18, 2008 8:35 pm

Man--that is killer sounding!!!

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