REAL AMP

zlast · 23rd October 2010, 03:17 AM

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 ?

ostripper · 23rd October 2010, 03:49 AM

photo's please...
OS

imfree707 · 23rd October 2010, 06:10 AM

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.

zlast · 24th October 2010, 02:15 AM

Quote:

Originally Posted by ostripper

photo's please...
OS

Actually 8245 VA, 0-88-120 Volt outputs, wire is 8 gauge....and these things
are REALLY heavy.

Bigun · 24th October 2010, 03:01 AM

Looks like these puppies are right up your street OS, I can see you playing harmonica through an arc-welder with these

ostripper · 03:40 AM

Quote:

Originally Posted by zlast

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"

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

djk · 08:57 AM

`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 150°F or so).

A Crest 9001 runs on about the same voltage, with about the same number of outputs, ±161V peak output.

tiefbassuebertr · 24th October 2010, 10:13 AM

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

ostripper · 24th October 2010, 01:09 PM

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

Bonsai · 24th October 2010, 01:15 PM

Integrated Class A stereo amp + room heater. Perfect for Alaska or northen Canada somewhere.

23rd October 2010, 03:17 AM	#1
zlast diyAudio Member Join Date: Sep 2004 Location: none	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 ? __________________ none

23rd October 2010, 03:49 AM	#2
ostripper diyAudio Member Join Date: May 2008 Location: Albany , NY (smallbany)	photo's please... OS __________________ Mongrel website , always current and updated : http://www.fidelityforce.com/ostripper

23rd October 2010, 06:10 AM	#3
imfree707 diyAudio Member Join Date: Oct 2010 Location: Tenn Loop Ranch, Lebanon, Tn.	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. __________________ A stiff power supply in a great-sounding amp is always better for you than a stiff drink.

24th October 2010, 03:01 AM	#5
Bigun diyAudio Member Join Date: Jan 2009 Blog Entries: 2	Looks like these puppies are right up your street OS, I can see you playing harmonica through an arc-welder with these __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

24th October 2010, 08:49 AM	#7
djk diyAudio Member Join Date: Feb 2001 Location: USA	`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 150°F or so). A Crest 9001 runs on about the same voltage, with about the same number of outputs, ±161V peak output. __________________ Candidates for the Darwin Award should not read this author. Last edited by djk; 24th October 2010 at 08:57 AM.


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24th October 2010, 10:13 AM	#8
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	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

24th October 2010, 01:09 PM	#9
ostripper diyAudio Member Join Date: May 2008 Location: Albany , NY (smallbany)	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 __________________ Mongrel website , always current and updated : http://www.fidelityforce.com/ostripper

24th October 2010, 01:15 PM	#10
Bonsai diyAudio Member Join Date: Aug 2006 Location: Taipei, Taiwan	Integrated Class A stereo amp + room heater. Perfect for Alaska or northen Canada somewhere. __________________ bonsai Amplifier Design and Construction for MUSIC! http://hifisonix.com/

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