Mystery Amplifier - check it out

lgreen · 4th December 2004, 04:22 PM

Funny thing about DIY, its got me visiting surplus stores looking for chassis, heat sinks, and other DIY matierials. Picked up this for $20, kind of expensive for "junk" but figured I could use the heat sinks. (Its the one on the right, the one on the left is my BOSOZ preamp shown for scale. See the preamp here).

Looks like an amplifier, its got lots of transistors and high power resistors. A real work of art, it will be a shame to take it apart. Looks military. Its pretty massive, perhaps suitable for an Aleph X or something?

Anyone know what this is? Ideas for the parts, are they any good? Was it a good deal or did I spend too much?

lgreen · 4th December 2004, 04:24 PM

A second pic

lgreen · 4th December 2004, 04:26 PM

A third picture

lgreen · 4th December 2004, 04:27 PM

A fourth picture. Lots of power resistors, power transistors, power diodes.

john curl · 4th December 2004, 05:40 PM

It looks like an industrial quality motor drive amplifier. It is usually relatively low voltage, high current, with a current output rather than voltage output. It will have to be completely changed to be useful, but the heatsink, itself, is worth what you paid. You can put a whisper fan on the end and still get good cooling, however, you must use a fan.

bear · 4th December 2004, 11:26 PM

The esteemed Mr. Curl is quite correct... but I can add one thing.
The heatsinks do come apart, and you get 4 very nice extrusions
which can be used vertically for pretty decent convection cooling
applications, but of course not at the same power levels that you
could with the original fan blasted method.

_-_-bear

Cobra2 · 4th December 2004, 11:32 PM

Quote:

Originally posted by john curl
It looks like an industrial quality motor drive amplifier. It is usually relatively low voltage, high current, with a current output rather than voltage output. It will have to be completely changed to be useful, but the heatsink, itself, is worth what you paid. You can put a whisper fan on the end and still get good cooling, however, you must use a fan.

Maybe you can use it as it is...current amps are very HOT nowadays (pun intended)...

Arne K

thomas997 · 5th December 2004, 06:08 AM

Nice buy for 20$

NUTTTR · 5th December 2004, 09:39 AM

Looks like a early krell amp, almost

The heatsinks are the same!
And they also used TO-3's..... good buy! Good heatsinks too
Aaron

jacco vermeulen · 5th December 2004, 01:39 PM

i see lots of 600 Volt Triac's, Thyristors and high power resistors.

Maybe someone tried using a Krill as a motor controller ?

4th December 2004, 11:26 PM	#6
bear diyAudio Member Join Date: Apr 2002 Location: New York State USA	The esteemed Mr. Curl is quite correct... but I can add one thing. The heatsinks do come apart, and you get 4 very nice extrusions which can be used vertically for pretty decent convection cooling applications, but of course not at the same power levels that you could with the original fan blasted method. _-_-bear __________________ _-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. --

5th December 2004, 01:39 PM	#10
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	i see lots of 600 Volt Triac's, Thyristors and high power resistors. Maybe someone tried using a Krill as a motor controller ? __________________ Looks like Sponge Bob has killed another thread.

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4th December 2004, 05:40 PM	#5
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	It looks like an industrial quality motor drive amplifier. It is usually relatively low voltage, high current, with a current output rather than voltage output. It will have to be completely changed to be useful, but the heatsink, itself, is worth what you paid. You can put a whisper fan on the end and still get good cooling, however, you must use a fan.

5th December 2004, 06:08 AM	#8
thomas997 diyAudio Member Join Date: Feb 2004 Location: Vancouver	Nice buy for 20$

5th December 2004, 09:39 AM	#9
NUTTTR diyAudio Member Join Date: Nov 2004 Location: Australia!	Looks like a early krell amp, almost The heatsinks are the same! And they also used TO-3's..... good buy! Good heatsinks too Aaron

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