I've written a complete guide to building your own Leach Amp 200Wx2 in 2U rack mount - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 4th January 2015, 09:43 PM   #1
diyAudio Member
Join Date: Oct 2013
Cool I've written a complete guide to building your own Leach Amp 200Wx2 in 2U rack mount




I have written a 37 page step by step guide with tons of supporting pictures, layouts, BOMs and hints to building your own Leach amp similar to the pictures you see attached. The guide will give you one click links to order every part needed. It provides prices for each component. You will find the the guide only in this thread and supporting documents in the next message and on Google Drive in the link below...

I couldn't upload everything to this thread due to the 1Mbyte size limit so I've provided a link to my Google Drive share below.


Charles Robison

Leach Amplifier Assembly Guide v1.0 _pg1-20.pdf

Leach Amplifier Assembly Guide v1.0 _pg21-37.pdf

Last edited by manbearbull; 4th January 2015 at 11:29 PM.
  Reply With Quote
Old 4th January 2015, 11:34 PM   #2
diyAudio Member
Join Date: Oct 2013
Default Supporting files for Leach Amp Assembly Guide

I'm attaching the supporting files for the assembly guide here in case the Google drive link ever expires or breaks.
Leach Amp Building Accessories BOM.pdf

Leach Amp Chassis BOM.pdf

Leach Amp PCB BOM.pdf

Leach Amp Chassis Layout.pdf

Leach Amp Chassis Measurements.pdf

Leach Amp ExpressPCB Layout.pdf

Leach Amp Rear Panel Layout & Measurements.pdf

PCB files.zip
  Reply With Quote
Old 7th January 2015, 08:16 AM   #3
Roushon is offline Roushon  India
diyAudio Member
Join Date: Sep 2004
Location: Mumbai (Bombay)
Default Thanks!

Thank you very much for opening the thread and giving all information about the Leach amp. I am about to begin the project.

S. Roushon
  Reply With Quote
Old 7th January 2015, 07:23 PM   #4
diyAudio Member
Join Date: Oct 2013
Default Good Luck! Keep me posted.

Glad to hear it Roushon. Keep me posted on how it goes.
  Reply With Quote
Old 8th January 2015, 07:56 AM   #5
44250 is offline 44250  Serbia
diyAudio Member
44250's Avatar
Join Date: Jan 2011
Location: Ugrinovci-Zemun-BELGRADE
Send a message via AIM to 44250
nice job!
  Reply With Quote
Old 9th January 2015, 02:05 PM   #6
Neville is offline Neville  United States
diyAudio Member
Join Date: Jul 2004
Location: Georgia
Well done Charles on your documentation. I have never heard a Leach amp before, how would you compare it to lets say Pass F4 or Aleph J? Is there a cheaper alternative to the cost of the pcb's?
  Reply With Quote
Old 9th January 2015, 02:16 PM   #7
diyAudio Member
Join Date: Apr 2014
Location: US
Hi Charles,

Can you kindly post the schematic? I am new and I am not familiar with Leach amp. Is it supposed to be a very good sounding amp?

  Reply With Quote
Old 10th January 2015, 01:05 AM   #8
diyAudio Member
Join Date: Oct 2013
Neville, I'm not entirely familiar with the Pass F4 or Aleph J but i've reviewed the output stage and in my opinion the Leach amp is a much higher end amp than these. Pass F4 is a class A amp running 50 watts into 4 ohm with two output transistors. Alepha J is running 25 watts (probably into 4 ohms). According to Dr. Leach, if you increase the bias current to run in a similar class A mode, this amp would be 1200Watts into 4 ohms but is not recommended as it cannot dissipate that much heat with the heatsinks in this design (The Leach Amp - Output Stage). The leach amp is an extremely robust and beautiful sounding class AB 200Watt amplifier with 4 output transistors (double the Pass 4 per channel).
As for the PCB cost... well unfortunately i have not found a cheaper option unless you are willing to build with friends or find others on this forum to divide the cost. It is cheaper per board to build 10 at a time than just 2.
  Reply With Quote
Old 10th January 2015, 01:10 AM   #9
diyAudio Member
Join Date: Oct 2013
you can find the schematic at the following link: http://users.ece.gatech.edu/mleach/l...aphics/ckt.pdf
let me know if that doesn't work and i'll post the schematic directly.

Also, absolutely a fantastic sounding amplifier. Extremely robust, elegant and most importantly sounds awesome! I do recommend running a pre-amp into the leach amp because it performs best with a high voltage, clean input.
  Reply With Quote
Old 10th January 2015, 02:28 AM   #10
diyAudio Member
ostripper's Avatar
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Nice build , man.

The leach does indeed sound nice.
My big brother "spooky leach" is quite the jaw dropper.

Never seen the "modern" TO-3p version of the original.

Mongrel website , always current and updated :
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
2U rack mount chassis 20inch deep mcluxun Swap Meet 7 11th May 2014 06:45 PM
2u Rack Cab Great For Chip Amps!!! jeffshort2000 Swap Meet 1 5th December 2007 01:05 AM
FS: 2U rack mount aluminum project case elementx Swap Meet 1 26th December 2006 05:14 AM
2U rack cases len_scanlan Swap Meet 0 12th January 2005 11:06 PM
Leach Amp Guide wigginjs Solid State 2 27th August 2004 10:29 PM

New To Site? Need Help?

All times are GMT. The time now is 07:52 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2