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Old 12th April 2012, 02:52 PM   #1
rss388 is offline rss388  United States
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Default MJF15030/31 versus MJE15030/31

Hi all,

I am overhauling a Krell KSA80. I read in various threads that the driver transistors, MJF15030/31, being plastic TO220 types, are more prone to thermal failures. Is there any reason I would not replace these devices with the MJE equivalents? These drivers are mounted on heatsinks that are not electrically connected.

Thanks much in advance.
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Old 12th April 2012, 02:57 PM   #2
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Just replace them with the MJE versions and use a insulation pad and a plastic bushing on the mounting screw.
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Old 12th April 2012, 04:19 PM   #3
jaycee is offline jaycee  United Kingdom
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If you are 100% sure the heatsinks are not electrically connected to anything, then you can mount them without insulation.
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Old 12th April 2012, 04:32 PM   #4
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Heatsinks are usually connected to ground in commercial amplifiers, but i've also seen floating at the supply rails.
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