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Old 21st July 2011, 06:33 PM   #1
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Question 2N3055 transistor, which brand to buy?

Here's my choice, Toshiba or NTE branded "Japan" Comments? Thanks.
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Old 21st July 2011, 07:30 PM   #2
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Toshiba
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Old 21st July 2011, 07:44 PM   #3
pdul is offline pdul  Denmark
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As far as i know, Toshiba does not make transistors with 2N in the name.
Probably fakes
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Old 21st July 2011, 07:47 PM   #4
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MJ15015 is the modern On Semi replacement for 2N3055. Has a defined SOA in addition to the 2N3055 specs. A little faster ft, might need 20 pf cap across be leads to prevent oscillation in some circuits. The MJ15015s I purchased in 2010, were made in Mexico. Newark.com is not known for selling fakes. I've had good luck with NTE parts, but they are pretty expensive. I replaced reputed 2N3055 (actually RCA 574844) with NTE181 matched pairs, also NTE60. I paid $9 for the NTE's in 1985, paid $1.67 for the MJ15015's in 2010 (plus $7 freight from NC).
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Old 21st July 2011, 07:56 PM   #5
pdul is offline pdul  Denmark
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You should try to get them from ON semi or ST or Semelab, With ON semi as the best choice
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Old 21st July 2011, 08:08 PM   #6
pdul is offline pdul  Denmark
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As far as i know, Toshiba does not make transistors with 2N in the name.
Probably fakes
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Old 21st July 2011, 08:28 PM   #7
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That'a what I thought too, but then I found this:
FS: 15 pcs. Genuine Toshiba 2N3055
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Old 21st July 2011, 08:34 PM   #8
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For audio outputs, don't buy any. Do not accept my word for it. Build an amplifier using 2n3055, and one with a better output. The price difference is small, but the sound difference is rather large.
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Old 21st July 2011, 09:06 PM   #9
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by Cornelis Spronk View Post
For audio outputs, don't buy any. Do not accept my word for it. Build an amplifier using 2n3055, and one with a better output. The price difference is small, but the sound difference is rather large.
doesn't it depend on the topology and operating conditions etc. ?
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Old 21st July 2011, 10:47 PM   #10
jcx is offline jcx  United States
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modern Q can have all of higher ft; higher, flatter hfe, better thermal ruggedness from modern packaging - what exactly is there to like about 2N3055 vs any of the last decade or so audio power output specific Q?

I have heard someone restoring a early Neve studio mixing board complaining they couldn't find "period" steel can 2N3055

Last edited by jcx; 21st July 2011 at 10:59 PM.
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