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Super_BQ 25th November 2003 10:36 PM

Removable TO-220 - Sockets
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Can someone comment on the use of TO-220 sockets? I think this may be a 1st in this forum to experiment.

I recently upgraded my BSOZ preamp to allow for "transistor swapping" just like how tube users can "tube roll" their valves for different sounds.

What sonic drawbacks are there to using these sockets? These were bought from Digikey and made by Molex/Waldom. The connection seems quite good.


jewilson 25th November 2003 11:42 PM

Sockets for T0220
I have found these test sockets for T0220 and T0247. However the only non test sockets I have found or the the Molex and their a marginal at best.

These Guys have test socket for all TO220 and TO247

If anyone else has a source let us know.

tomchaoda 28th November 2003 03:58 PM

Heat sink type?
The heat sink type is what I am looking for a long time! I was not able to find similar in Mouser or Digikey, or local shop.

I also search the Aavid Thermalloy catalog, but can not find it!

Where did you buy it from?


Mark A. Gulbrandsen 28th November 2003 05:11 PM

They have sinks like those at Ra-Elco in Salt Lake City for 50 cents each. Call and ask for Robert or Brian. 801-487-7749


Super_BQ 29th November 2003 09:05 PM


I salvaged all these small heatsinks from the local scrap metal recycler. Specifically, this heatsink came out of an old Mita photo copying machine. Believe me, it was not easy in dismantling these photocopiers just to get at those heatsinks.

I've managed to use all of them up on other projects and would love to find more. You're right, Digikey, Allied, Mouser don't carry them. Apparently they all carry the same generic ones that are MUCH smaller (count the # of fins) OR they are too bulky in size (too fat and square) in that they do not fit with the other components around on the PCB. Ideally, I would like to find more with the same size foot print and extend longer.


gnomus 30th November 2003 03:35 AM

The problem with solid state sockets and other types of terminal connectors/blocks is that theyare not made of tin plated copper. Most are brass tin plate or nickel plate. Many items in catalogs do not even tell you what the base metal is. Your better of soldering.
It would be nice to have qualtiy sockets like tube guys can get.

Super_BQ 30th November 2003 09:50 AM

Base Metal - Quality in Sound

The .pdf link shows that these socket are made of tin-plated brass.

I don't clearly understand if there's an audible difference between tin-plated copper vs tin-plated brass? I mean it's only the tin plating that the transistor pins have contact to?

Eitherway, I can't seem to hear the difference when I had the transistors directly soldered vs. using these sockets. I would think a different brand of transistor would have a bigger influence in sound quality over what metal is used in the sockets?


gnomus 30th November 2003 09:13 PM

Just prefer copper. Better conductor. Not even looking for oxygen free copper. Very little difference between that and regular copper.

Nelson Pass 30th November 2003 09:46 PM

Oxidation is a problem long term. Gold against Gold is the
preferred long term solution. For short term testing, anything
will usually work.

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