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avincenty 26th December 2012 11:25 PM

Heatsinks from Surplus Store for J2 or F6
2 Attachment(s)
I found these two heatsinks at my local surplus store. But no clue what the rating is on these. Also on order are some Semisouth SJEP120R125 so I need to figure out if these heatsinks are large enough for a stereo amp. I am a tube guy and this is my first try at a diy solid state amp. Thinking either on a J2 or a F6. Hopefully by the looks of them it should be ok for either amp. Is this wishful thinking on my part?


6L6 27th December 2012 12:26 AM

Those will be fine for the amps you are interested in. :D :D :D

Keep calm and carry on.

Post lots of photos!!

flg 27th December 2012 12:33 AM

They look great but, Ideally the best way to use them would be to cut them in two vertlcle 6" tall sinks/ch.You always get the best efficeincy without fans etc. when you orient it with verticle fins but unless specifically made for a long configuration (greater space between fins) 6"-8" is all that would be useful with those. I have a similar Fischer model that does 80-90W at about 5.5wx6dx8h.
I might guess you could do about 100-120W without going over 55C on the sink if they were side by side and 6" high. Of coarse YMMV. Maybe there will be a consencus estimate that will get you going :D

Zen Mod 27th December 2012 12:51 AM

1 Attachment(s)
comparable with this :

( as said - best to cut them and mount vertically , connected with L or plate heat spreader )

or - without cutting - simply make tall amp

avincenty 27th December 2012 01:27 AM

1 Attachment(s)
Thanks guys. Cutting them may be difficult for me. How about this? V sticking up.

6L6 27th December 2012 02:06 AM

Those heatsinks are made to have natural convection, and with the proper orientation will be able to get rid of some goodly amounts of heat. If not able to cut them, the best would be to build a tall amp. There are some good examples of it around.

Andersonix 27th December 2012 03:08 AM

If you tell a local metal supplier what you need done (cut in half), who knows, they may be able to cut it for a small charge on their stock saw and maybe even clean up the sawcut on a mill, or direct you to a machine shop? Ask around...

A six inch tall amp will be perfect use of them.

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