A40

thistlehd · 27th December 2007, 03:44 PM

I found this piece at the local electronic junk store, thought that it was really cool, and that I would be the only one to have such a wierd device with the heat sinks turned toward the center. Then I saw a very similar piece in a 1978 Nelson Pass article about the A40 amp. Anybody know what it is?

gl · 27th December 2007, 03:48 PM

It's a forced air heatsink assembly. You mount a fan on one end to blow air through it. Probably a 4" fan would be my guess.

Graeme

thistlehd · 27th December 2007, 04:02 PM

It already has a fan on the other side, but what was the thing made to do?

Thanks

gl · 27th December 2007, 05:18 PM

First of all I suspect that the heatsink assembly you show is only part of some other larger assembly. What was the purpose of that assembly you ask? - it's impossible to know. If I had to guess I would say it was 1) part of a large analog power supply or 2) the output stage for a large amplifier. Keep in mind that there are lots of different types of amplifiers and only some of them are suitable for audio. To get a better idea you would need to sketch out the circuit of what you have, then look up the power transistor specs.

I think you had it nailed in your first post. The heatsink alone would make a great basis for an A40! It's unlikely that you could use the whole thing as the output section of a first class amp. I've never been that lucky with my surplus store finds. But then again - you might be.

Graeme

Nelson Pass · 27th December 2007, 06:18 PM

It looks like one of mine, but it's not.

zeonrider · 27th December 2007, 06:41 PM

It look like an old voltage regulator (line), from old Server-psu.

Good old gear!

I be able to see similar staf on the local scrapyard, very cheap about 10 Euro/14$

Fan is 120x120 (4,7244").

Mr.Nelson it is older than you

!

Regards zeoN_Rider

Nelson Pass · 27th December 2007, 06:54 PM

Quote:

Originally posted by zeonrider
Mr.Nelson it is older than you !

No, it has transistors in it.

jacco vermeulen · 27th December 2007, 07:12 PM

you don't ?

Zen Mod · 27th December 2007, 07:36 PM

Quote:

Originally posted by zeonrider
It look like an old voltage regulator (line), from old Server-psu.

Good old gear!

I be able to see similar staf on the local scrapyard, very cheap about 10 Euro/14$

Fan is 120x120 (4,7244").

Mr.Nelson it is older than you !

Regards zeoN_Rider

do you mind buying few for me ?

zeonrider · 27th December 2007, 07:50 PM

No, tomorow when I come back has gone,or sold.

But Bubanj Potok je keva. Pogladacu.I told you(by phone) half year ago that I, have many heatsinks.
Remamber Aleph PCBs by Kostas.

Regards zeoN_Rider

27th December 2007, 06:41 PM	#6
zeonrider diyAudio Member Join Date: Mar 2004 Location: Belgrade RS	Hi ! It look like an old voltage regulator (line), from old Server-psu. Good old gear! I be able to see similar staf on the local scrapyard, very cheap about 10 Euro/14$ Fan is 120x120 (4,7244"). Mr.Nelson it is older than you ! Regards zeoN_Rider

27th December 2007, 07:12 PM	#8
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	you don't ? __________________ Looks like Sponge Bob has killed another thread.

27th December 2007, 07:50 PM	#10
zeonrider diyAudio Member Join Date: Mar 2004 Location: Belgrade RS	Hi Zen Mod ! No, tomorow when I come back has gone,or sold. But Bubanj Potok je keva. Pogladacu.I told you(by phone) half year ago that I, have many heatsinks. Remamber Aleph PCBs by Kostas. Regards zeoN_Rider

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27th December 2007, 03:48 PM	#2
gl diyAudio Member Join Date: Dec 2003 Location: Sierra Foothills - California	It's a forced air heatsink assembly. You mount a fan on one end to blow air through it. Probably a 4" fan would be my guess. Graeme

27th December 2007, 05:18 PM	#4
gl diyAudio Member Join Date: Dec 2003 Location: Sierra Foothills - California	First of all I suspect that the heatsink assembly you show is only part of some other larger assembly. What was the purpose of that assembly you ask? - it's impossible to know. If I had to guess I would say it was 1) part of a large analog power supply or 2) the output stage for a large amplifier. Keep in mind that there are lots of different types of amplifiers and only some of them are suitable for audio. To get a better idea you would need to sketch out the circuit of what you have, then look up the power transistor specs. I think you had it nailed in your first post. The heatsink alone would make a great basis for an A40! It's unlikely that you could use the whole thing as the output section of a first class amp. I've never been that lucky with my surplus store finds. But then again - you might be. Graeme

27th December 2007, 06:18 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	It looks like one of mine, but it's not.

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