2N3055 transistor, which brand to buy?

oldglide · 21st July 2011, 06:33 PM

Here's my choice, Toshiba or NTE branded "Japan" Comments? Thanks.

Michael Bean · 21st July 2011, 07:30 PM

Toshiba

pdul · 21st July 2011, 07:44 PM

As far as i know, Toshiba does not make transistors with 2N in the name.
Probably fakes

indianajo · 07:55 PM

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).

pdul · 21st July 2011, 07:56 PM

You should try to get them from ON semi or ST or Semelab, With ON semi as the best choice

pdul · 21st July 2011, 08:08 PM

As far as i know, Toshiba does not make transistors with 2N in the name.
Probably fakes

Michael Bean · 21st July 2011, 08:28 PM

That'a what I thought too, but then I found this:
FS: 15 pcs. Genuine Toshiba 2N3055

Cornelis Spronk · 21st July 2011, 08:34 PM

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.

Bigun · 21st July 2011, 09:06 PM

Quote:

Originally Posted by Cornelis Spronk

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. ?

jcx · 10:59 PM

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

21st July 2011, 06:33 PM	#1
oldglide diyAudio Member Join Date: Mar 2009 Location: Metro Chicagoland	2N3055 transistor, which brand to buy? Here's my choice, Toshiba or NTE branded "Japan" Comments? Thanks.

21st July 2011, 07:47 PM	#4
indianajo diyAudio Member Join Date: Jan 2010 Location: Jeffersonville, Indiana USA	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). __________________ Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,SP2-XT's, T-300 HF Projs, Steinway console, Herald RA88a mixer, Wurlitzer 4500 Last edited by indianajo; 21st July 2011 at 07:55 PM.

21st July 2011, 10:47 PM	#10
jcx diyAudio Member Join Date: Feb 2003 Location: ..	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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21st July 2011, 07:30 PM	#2
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	Toshiba

21st July 2011, 07:44 PM	#3
pdul diyAudio Member Join Date: Jan 2009	As far as i know, Toshiba does not make transistors with 2N in the name. Probably fakes

21st July 2011, 07:56 PM	#5
pdul diyAudio Member Join Date: Jan 2009	You should try to get them from ON semi or ST or Semelab, With ON semi as the best choice

21st July 2011, 08:08 PM	#6
pdul diyAudio Member Join Date: Jan 2009	As far as i know, Toshiba does not make transistors with 2N in the name. Probably fakes

21st July 2011, 08:28 PM	#7
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	That'a what I thought too, but then I found this: FS: 15 pcs. Genuine Toshiba 2N3055

21st July 2011, 08:34 PM	#8
Cornelis Spronk diyAudio Member Join Date: Jul 2005 Location: Cambridge, England	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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