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Replacements for 2sa747a transistors
Replacements for 2sa747a transistors
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Old 1st June 2009, 01:58 AM   #1
AmpKiller66 is offline AmpKiller66  United States
diyAudio Member
Join Date: Mar 2007
Location: Kansas
Default Replacements for 2sa747a transistors

Hello, I'm currently repairing a Yamaha EM-300 powered mixer with blown output transistors in the right channel power amp. Of course, the transistors are the long-discontinued 2SA747A, which are nearly impossible to get ahold of at a resonable price. Does anyone know of any equivalent transistors that I could use as a replacement? These transistors are 140V, 100W, 15Mhz parts with an Hfe of 30 @ 3A @ 4V
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Old 1st June 2009, 06:17 PM   #2
Nicowico is offline Nicowico  Netherlands
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Join Date: Oct 2005
I don't know what you think is resonable:
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Old 2nd June 2009, 12:37 AM   #3
jaycee is offline jaycee  United Kingdom
diyAudio Member
Join Date: Apr 2004
Location: Norwich, UK
I would simply put MJ21194 in there. Not as fast, but it wouldn't matter.
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