101 Leach Amp

[deanw711]

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]

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]

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/papers/lowtim/feb76feb77articles.pdf is the original article

 

[djk]

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]

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

 

[engel dela pena]

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]

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

 

[djk]

The Leach Amp - Feedback Network

 

[TonyTecson]

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

 

[asia]

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?