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Old 15th October 2011, 03:51 PM   #2011
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Since I know everything works...here is my 5.1 system
30v 1200va toroidal transformer
150,000uf of caps
6x l20 amplifiers
5.1 with LCD and remore control preamp.

Sound output is good. Need to do some testing with the oscilloscope.

Cheers
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Old 16th October 2011, 07:51 PM   #2012
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These aren't strict DIY amps, but I'll be improving them myself.

I recently bought 2 pairs of Marantz MA-24s that are now biamping my Vandersteen 5As. Here's one pair, topless.

The brown or black bars are 3"-wide steel, are footed with Herbie's GrungeBuster dots, and are intended to reduce spurious vibrations.

I'm an incorrigible tweak and will be improving parts in them gradually. Have already added a couple pairs of BlackGate caps bypassing the output-stage PS. They sort of fell in, under the screw terminals.

The 2 small brown caps at the bottom of this pic are the Voltage-stage PS caps and will soon be BlackGates.
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File Type: jpg 12Oct2011_OSbypasscaps_1280w.jpg (132.6 KB, 1160 views)
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Old 16th October 2011, 09:35 PM   #2013
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Default One more Dx amplifier being assembled

This time the MKIII Hx sold in the group buy in this same forum and also in other international forum.

Here a board under construction by Juan Vargas from Puerto Rico.

This amplifier can reach 1 kilowatt (with some distortion)

regards,

Carlos
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Old 17th October 2011, 02:06 AM   #2014
notoso is offline notoso  United States
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Default My New 6-Channel Leach Amp 4.5v Original Board

Hey guys, I would like to introduce you all to my new Leach Amp, all original board and components. Thanks Prof. Leach, I have played it loud (with cheap speakers) a few times so you can hear it way up there where you are.

I am kind of a newbie, but I took this challenge because of the good reviews about this amp, many positive comments here in the forum, well documented notes, but most importantly, coaching from Prof. Leach while he was alive; what a great and generous individual, he always responded to my dumb questions.

I decided to do a 6-channel so that I can eventually put it to a surround sound duty, I am still looking for a decent Surround Sound preamp and willing to make my own speakers. So, if some members here have suggestions for a good Surround Processor-Preamp and speakers, please let me know, I will really like to hear this Leach Amp with good speakers.

I would also like to thank many members here because even thought I been passive in this forum, I have learned quite a lot reading their postings, comments, inputs and discussions. I have not posted any questions because I been fortunate to find answers to most of what I was looking already posted in various treads. So thanks to many of you because without you knowing, you have helped me resolve many of my frustrations and made it possible for me to finish this great sounding Amp.

Thanks also in advance for all your suggestions about which Processor and Speakers to go after.
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Old 17th October 2011, 02:53 AM   #2015
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by jeffreybehr View Post
These aren't strict DIY amps, but I'll be improving them myself.

I recently bought 2 pairs of Marantz MA-24s that are now biamping my Vandersteen 5As. Here's one pair, topless.

The brown or black bars are 3"-wide steel, are footed with Herbie's GrungeBuster dots, and are intended to reduce spurious vibrations.

I'm an incorrigible tweak and will be improving parts in them gradually. Have already added a couple pairs of BlackGate caps bypassing the output-stage PS. They sort of fell in, under the screw terminals.

The 2 small brown caps at the bottom of this pic are the Voltage-stage PS caps and will soon be BlackGates.
teflon hand made speaker cables, cable from navships ?
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Old 17th October 2011, 04:08 AM   #2016
lowpoke is offline lowpoke  Australia
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@notoso

That's a GOOD LOOKIN' amp! (Inside AND out.)
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Old 17th October 2011, 09:03 AM   #2017
rfj5106 is offline rfj5106  United States
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Default hello AlexontheRocks

What sort of soft start circuit did you use on your amp?
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Old 17th October 2011, 12:28 PM   #2018
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here you are

Hazardous (soft start circuit) design schematic removed by moderation
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Old 17th October 2011, 12:30 PM   #2019
AndrewT is offline AndrewT  Scotland
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You have direct on-line mains supplied to part of the circuit. Sort the safety of that first !!!!!!
You should not have NTC in parallel. Sort that second.
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Old 17th October 2011, 12:32 PM   #2020
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I've built 4 and all of them have been used for toroids ranging from 500va to 2000va (4x toroids in parallel).

They work flawlessly. Honestly it would take too much effort to change them. Possibly in the next builds I will change the circuit.

Thanks for the input.
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