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Old 6th March 2012, 04:13 AM   #51
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MJE15034 and MJE15035 is worth to try.
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Old 21st May 2012, 02:57 PM   #52
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How about these drivers Fairchild's KSC2073 / KSA940 . Mugen hybrid amp is using it. Is it better than bd's 139/140?
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Old 25th November 2012, 06:07 PM   #53
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the nte373 and nte373 seems to be exact replacements for both of these parts, Im already half way through a board using both of these parts what do you guys think??
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Old 6th January 2014, 07:42 PM   #54
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Quote:
Originally Posted by whitnasty1 View Post
the nte373 and nte373 seems to be exact replacements for both of these parts, Im already half way through a board using both of these parts what do you guys think??
Do you mean NTE373 and NTE374? I still have several of Mr Sloans boards for the Optimos and want to fill them. Are there any other discontiued parts I should be aware of?
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Old 28th November 2016, 10:08 AM   #55
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Old thread, but google found it for me!

I have a subwoofer amplifier to fix, that has a 2SD669 and 2SB649.

One appears to have cooked itself, so I plan to replace them both.

Obviously, its a subwoofer amplifier, its a down firing woofer, and I'm not overly concerned about SQ.

So, what part can I use, that I can easily get here in Australia? I'd probably prefer TO220, just for the increased thermal mass....

Thanks!
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Old 28th November 2016, 11:40 AM   #56
sangram is offline sangram  India
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TO-220 is not compatible with the footprint of TO-126.

If you have supply rails less than 40V you can use BD139/140.

Other pin-to-pin replacements include the MJE340 and 350.

However not all specifications are the same and the parts may not be electrically compatible.

For most power amplifiers this should not be an issue as long as the device limits are respected. You need to work out if the devices can be directly substituted.
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Old 29th November 2016, 06:30 AM   #57
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Originally Posted by sangram View Post
TO-220 is not compatible with the footprint of TO-126.
That depends how hard you push...
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Old 29th November 2016, 07:27 AM   #58
sangram is offline sangram  India
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Base and emitter are reversed between the two, it's not the pad size.

Which means the heatsink tab ends up on the wrong side if the whole assembly goes on to a sink. You could do it with individual sinks.

If TO-220 parts work for you the 4793/1837 pair should be more than sufficient.
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