101 Leach Amp

deanw711 · 4th May 2006, 06:34 PM

I want to place my amp up for auction on EBay, but, I'm ashamed to say, I don't know that much about it. I bought it second hand from some good ol' boy in Utah in the mid '80s, and have no paperwork.

My research would lead one to believe that LSR&D only sold kits, but this certainly doesn't look like the kits that I've seen (See attachment).

The unit gives the following info:

LSR&D, Inc.
6776 Collier Way
Riverdale, Georgia 30296

Model: 101 Leach Amp
Serial No.: 001256
120 VAC 1000 Watts 50/60 Htz

An audiophile I'm not. I would appreciate any information on the amp that anyone could give me.

Rock on, gentlemen ! Dean

Mikett · 4th May 2006, 06:47 PM

I remember that in the late 70's when the original Leach amp was unveiled there were some companies selling "clones" of the design. This may be one of them.

jaycee · 4th May 2006, 07:10 PM

http://users.ece.gatech.edu/~mleach/lowtim/

This is the website of the guy who designed it, and has the information there for the latest version of the circuit. He also has the original articles from which this amp is undoubtedly based.

http://users.ece.gatech.edu/~mleach/...77articles.pdf is the original article

djk · 5th May 2006, 01:58 AM

The LSR&D 101 was the good one, 160W/8R.

Contact me if you want to sell it.

dkleitsch(at)yahoo(dot)com

engel dela pena · 24th December 2010, 08:31 AM

LSR&D link
LSR&D and Electronics One Amplifier Circuit Diagrams
schematic

engel dela pena · 24th December 2010, 08:37 AM

can somebody share reasons why R19/C9 going to Q11,12 emitter is not implemented on low tim's 4.5?
here is v4.5

engel dela pena · 24th December 2010, 08:39 AM

in low tim 4.5
or leach 4.5
C9 going to R20 ,going to R34,35

djk · 24th December 2010, 08:59 AM

The Leach Amp - Feedback Network

Tony · 24th December 2010, 09:11 AM

@engel, please read thru the attachments for post #3 and the explanations given in post #8 for answers to your questions....enjoy...

asia · 24th December 2010, 12:13 PM

thanks djk
thanks sir tony,
i'm planning to make 10 pairs,
using LSR&D or better using low tim leach4.5?
maybe i will disable protection i don't know how to calculate emitter sensor
sir tony,or better use sir dacuycoy pcb and make it 10 pair?

24th December 2010, 09:11 AM	#9
Tony diyAudio Moderator Join Date: May 2003 Location: Palatiw, Pasig City	@engel, please read thru the attachments for post #3 and the explanations given in post #8 for answers to your questions....enjoy... __________________ http://www.elab.ph/forum/index.php?topic=32688.0

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4th May 2006, 06:47 PM	#2
Mikett diyAudio Member Join Date: Aug 2003 Location: Toronto	I remember that in the late 70's when the original Leach amp was unveiled there were some companies selling "clones" of the design. This may be one of them.

4th May 2006, 07:10 PM	#3
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	http://users.ece.gatech.edu/~mleach/lowtim/ This is the website of the guy who designed it, and has the information there for the latest version of the circuit. He also has the original articles from which this amp is undoubtedly based. http://users.ece.gatech.edu/~mleach/...77articles.pdf is the original article

5th May 2006, 01:58 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	The LSR&D 101 was the good one, 160W/8R. Contact me if you want to sell it. dkleitsch(at)yahoo(dot)com

24th December 2010, 08:39 AM	#7
engel dela pena diyAudio Member Join Date: Oct 2005	in low tim 4.5 or leach 4.5 C9 going to R20 ,going to R34,35

24th December 2010, 08:59 AM	#8
djk diyAudio Member Join Date: Feb 2001 Location: USA	The Leach Amp - Feedback Network __________________ Candidates for the Darwin Award should not read this author.

24th December 2010, 12:13 PM	#10
asia diyAudio Member Join Date: Dec 2010	thanks djk thanks sir tony, i'm planning to make 10 pairs, using LSR&D or better using low tim leach4.5? maybe i will disable protection i don't know how to calculate emitter sensor sir tony,or better use sir dacuycoy pcb and make it 10 pair?