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18w plexi (2203 preamp)
Posted: Sat Oct 09, 2010 5:18 am
by menthal
I made a small 18w plexi(channels in series like the 2203 preamp). It's only three gain-stages though, I removed the cathode follower.
Recorded with a SM57 and Vintage 30's.
http://www.netmusicians.org/files/2-18watt.mp3" onclick="window.open(this.href);return false; (recorded with an attenuator).
http://www.netmusicians.org/files/77-18watt-noaut.mp3" onclick="window.open(this.href);return false; (beefier filter caps and bass not at max)
The bass is a bit flubby, but other than that I think it sounds ok.
Next time I'll not max the bass dial.

Re: 18w plexi (2203 preamp)
Posted: Thu Oct 21, 2010 3:51 pm
by Dunkmop
I like it. Sounds good.
What guitar/pups you using on the first attenuated clip?
Re: 18w plexi (2203 preamp)
Posted: Fri Oct 22, 2010 5:04 am
by menthal
Dunkmop wrote:I like it. Sounds good.
What guitar/pups you using on the first attenuated clip?
Cool.
The guitar is a Les Paul clone(made of alder) and the pickups are a combo of Duncan '59/Distortion.
Re: 18w plexi (2203 preamp)
Posted: Fri Oct 22, 2010 7:03 am
by Dunkmop
It almost sounds like a single coil sound as you move up the board. Is the pickup tapped?
Re: 18w plexi (2203 preamp)
Posted: Fri Oct 22, 2010 7:13 am
by menthal
Dunkmop wrote:It almost sounds like a single coil sound as you move up the board. Is the pickup tapped?
No coil tap.
Re: 18w plexi (2203 preamp)
Posted: Fri Oct 22, 2010 3:50 pm
by Dunkmop
Is the neck pup a distortion or 59? sounds good on the highs, like you said a little flabby on the bass. If you can sort out the lower end = lovely sound amp all round, including wattage.
Re: 18w plexi (2203 preamp)
Posted: Fri Oct 22, 2010 4:09 pm
by menthal
Dunkmop wrote:Is the neck pup a distortion or 59? sounds good on the highs, like you said a little flabby on the bass. If you can sort out the lower end = lovely sound amp all round, including wattage.
Neck pup is a '59.
Yeah it's a cool little amp, gonna add a choke and beef up the filter caps, that should tighten the bass.
Re: 18w plexi (2203 preamp)
Posted: Tue Dec 14, 2010 8:37 pm
by cyprusx
Hi Menthal,
How is your progress with this build coming along? I decided to build this based on your schematic that you had posted on another site. Not sure if you have made any updates which you would want to share. I am nearing completion and only have to wire the board in and decide if I am going SS rect or use an EZ81.
Thanks!
Rick
Re: 18w plexi (2203 preamp)
Posted: Tue Mar 01, 2011 5:44 pm
by crustodd
WOW! I think that sounds GREAT! A little gritty, but very MEATY. How much you got in to the build?