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Old 23rd October 2010, 03:17 AM   #1
zlast is offline zlast  United States
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Default REAL AMP

Ok, I have two (2) 8000 VA toroidal transformers, 230 volt input with dual 88 volt secondaries.
Anyone up for building a REALLY MANLY amplifier ? MAybe a six channel project 117
Almost Halloween....MONSTER amp....anyone need a couple LARGE transformers ?
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Old 23rd October 2010, 03:49 AM   #2
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photo's please...
OS
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Old 23rd October 2010, 06:10 AM   #3
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Default Monster Amp

If anyone builds that amp, here's the classic track to demo it on 10/31/2010!
Bobby Boris Pickett-Monster Mash YouTube - Halloween! - Bobby Pickett - Monster Mash - (HD Stereo)

A 45 (too bad, not LP) on a nice-looking linear-tracking turntable.
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Old 24th October 2010, 02:15 AM   #4
zlast is offline zlast  United States
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Default Photos

Quote:
Originally Posted by ostripper View Post
photo's please...
OS
Actually 8245 VA, 0-88-120 Volt outputs, wire is 8 gauge....and these things
are REALLY heavy.
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Old 24th October 2010, 03:01 AM   #5
Bigun is offline Bigun  Canada
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Looks like these puppies are right up your street OS, I can see you playing harmonica through an arc-welder with these
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Old 24th October 2010, 03:32 AM   #6
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Quote:
Originally Posted by zlast View Post
Actually 8245 VA, 0-88-120 Volt outputs, wire is 8 gauge....and these things
are REALLY heavy.
You could use them as a set of free-weights. Shipping would be expensive. I have only 1 unreleased "DOG" that could handle them (below-EX). The 2/ 0-88 taps would give 120-0-120V rails...
What I don't have is a speaker that can handle 1.5KW.

Try to sell/trade them at the swap meet section of DIYA.

Nico Ras's "big booty amp" Click the image to open in full size.
would eat these puppies right up.
They are industrial isolation trafo's for deriving 120v to power remote instrumentation in a factory.... they would have to be rewound to be useful for audio. You could use them in the US hooked up to the range circuit .. they would Definitely!! cut out any 15/20A typical household circuit.

OS
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Last edited by ostripper; 24th October 2010 at 03:40 AM.
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Old 24th October 2010, 08:49 AM   #7
djk is offline djk
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`I would wire them up as 120-32-0-32-120.

This would give about 45V and about 170V.

I would run it class AB+G.

The transistors on the lower rails would need to be a minimum of 215V, the transistors on the upper rail need be only 125V minimum. I would probably use eight pair of MJ21195/96 per rail (32 outputs per channel), or a dozen pair if you wanted to use plastic (48 outputs per channel).

In normal use I doubt if it would ever get out of class AB (200W/4R), so you could bias it up hard for good class A power (up until your heatsinks got to 150F or so).

A Crest 9001 runs on about the same voltage, with about the same number of outputs, 161V peak output.
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Last edited by djk; 24th October 2010 at 08:57 AM.
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Old 24th October 2010, 10:13 AM   #8
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Default Circlotron Topology could be the best choice

some URLs:
URL collection of Totem Pole and CSPP (Single Ended related) Solid State Output Stage
http://www.ne.jp/asahi/evo/amp/J200K1529/exp21.gif
Circlotron Meditations
Circlotron
SUMO Power Amp
Inductor Circlotron
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Old 24th October 2010, 01:09 PM   #9
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APEX audio's class H 1KW would be a very good candidate as well. I would not want to buy all those caps , even through APEX JR.... 2 X 100V samwha's in series... OS
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Old 24th October 2010, 01:15 PM   #10
Bonsai is offline Bonsai  Taiwan
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Integrated Class A stereo amp + room heater. Perfect for Alaska or northen Canada somewhere.
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