kurtlives91
Let The Pretend Take Over
Join date: Jun 2007
2,732 IQ
#1
Over the last few months I have been putting together, building and recording a new amp. The amp is derived from the classic Marshall 1974x (18W) design and shares much of the same elements. It is however modified and voiced to be more of a 20W Plexi ala JTM45/JTM50/1959. Think small package Plexi tones without the killer volume. So fat clear clean tones and singing distorted tones. Lots of chunk and grind too.

-20W
-5AR4 tube rectifier
- TMB channel with Gain, Volume, Treble, Middle and Bass controls. This is your classic Marshall channel.
- Normal channel with Volume and Tone controls. This channel comes straight from the 18W design.


Everything you wanted to know about the design and controls of the amp can be seen in the schematic
http://i1.wp.com/pdfelectronics.com/wp-content/gallery/18w-build/20w-plexi-schematic.jpg?

Interesting things to note:
- VRM control (controls B+ of the entire amp for a very effective master volume control)
- 6V6GT output tubes
- Quasi cathode bias to mimic a fixed bias output section
- JTM45/Plexi switch to change the preamp from a JTM45 to a Plexi (1959) preamp
- Three way preamp boost switch, bright-flat-fat

As for some pics...
The completion of this amp coincided nicely with acquisition of my ES-335














For more info, pics and sound clips check out http://pdfelectronics.com/18w-plexi/ Interested to here some feedback on the soundclips. I am no expert in recording but I did the best I could with what I had on hand/knew.
CSmartt
Registered User
Join date: Dec 2009
10 IQ
#2
The cleanliness of that wiring is unbelievable
We don't get on, reality and I...

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Phoenix V
Registered MUser
Join date: Mar 2011
715 IQ
#4
Nice overall job.

Clean solid soldering, neat structured wiring. Pride in the workmanship comes through.

Nice ES-335 too
'It takes 100 guitar players to change a light. One to change the light and 99 to stand around pointing, saying..."Yeah man, look...I can do that too"...'

My gear is in my Profile

Builds & Refurbs
Hondo 780 Deluxe
Gibson Studio
Epi LP100
red.guitar
Imagine All The People
Join date: Mar 2007
3,037 IQ
#5
Looks slick man.

Did you source the parts yourself, or is that a trinity amp kit??
Guitars:
PRS Custom 24
Gibson Les Paul 60's Tribute
85' MIJ Strat
97' Snakepit Les Paul
LP Traditional 1960 Zebra
02' Dean TC Z

Amps:
EVH 5150iii
Peavey Ultra 112
Jet City JCA50H
Peavey VTM 60
Peavey XXX
derekgross
Derek
Join date: May 2009
24 IQ
#6
sounds good man

Id like to hear one where you push those tubes a little more man

but the cleans are perfect
kurtlives91
Let The Pretend Take Over
Join date: Jun 2007
2,732 IQ
#7
Thanks all

Quote by red.guitar
Looks slick man.

Did you source the parts yourself, or is that a trinity amp kit??

Sourced the parts myself
eddiehimself
Call me EH, eh?
Join date: Jun 2006
1,541 IQ
#8
You make it look easy man! Gorgeous
EH


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