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Posted by grhughes (A) on December 8, 2011 at 07:47:04

In Reply to: Choosing the BEST preamp output transistor 2SC3421??? posted by grhughes on December 6, 2011 at 09:05:04:

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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Topic - Choosing the BEST preamp output transistor 2SC3421??? - grhughes 09:05:04 12/06/11 (1)

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