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Choosing the BEST preamp output transistor 2SC3421???

69.71.1.1
Posted on December 6, 2011 at 09:05:04
grhughes
Audiophile

Posts: 2476
Location: Central US
Joined: February 17, 2004
 If you had to choose the BEST, MOST RELIABLE output emitter follower transistors to operate CLASS A, + and - 24v, what would they be???? Toshiba 2SC3421 and 2SA1358??? MJE171, MJE181??? Thanks, Ray
"The gift of imagination is a gift of the Gods imparted to a few who receive innumerable kicks in the a$$ their entire life." Le Corbusier (Charles-Édouard Jeanneret)

 

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More info:, posted on December 8, 2011 at 07:47:04
grhughes
Audiophile

Posts: 2476
Location: Central US
Joined: February 17, 2004
 I was a follower of Professor Marshall Leach at Georgia Tech and in 1977 I built his discreet FET preamp that was published in Audio Magazine. I carefully matched all the transistors as to beta/hfe/d-s current). I would like to think that science and engineering has improved upon transistor manufacture since 1977. Am I wrong? I would like to think that the transistors avaliable today have fewer impurities in their silicon sandwich. Am I wrong? Are the Toshiba/Hitachi transistors better than the old National and Fairchild transistors I used in 1977? This all N output stage is now using mps8099/2n5210. I was thinking about the Toshiba 2sc3421 on heat sinks.

I have to re-cap these preamps as their electrolytics have given up the ghost. While there I was contemplating changing or upgrading the transistors also especially the Class A output stage with adding heat sinks. I have toyed with adding a 1:1 output transformer to drive balanced lines 600 ohm but that is not absolutely necessary. Thanks for any advice. Ray
"The gift of imagination is a gift of the Gods imparted to a few who receive innumerable kicks in the a$$ their entire life." Le Corbusier (Charles-Édouard Jeanneret)

 

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