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Old 12th February 2009, 11:42 AM   #1
thomasfw is offline thomasfw  Hong Kong
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Join Date: Jan 2005
Location: Hong Kong
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Do any one know about 2N6259,2N3716,2N3792 ,
can they be used in Audio Power Amp ?
I can find out the data sheet but don't know they are as good as MJ15003 or MJ802 in sound of view ?

Thanks !
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Old 12th February 2009, 12:59 PM   #2
wg_ski is offline wg_ski  United States
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Join Date: Oct 2007
2N3716/3792 are not as good as 2N3055/MJ2955. Beta linearity is no better and second breakdown makes them unattractive even at +/-30V supply (which the 3055 can do nicely). They were intended for low voltage regulators, not audio. You'd be just as well off with TIP41/42.

The 2N6259 is the 250W version of the "slower" variety of 2N3773. Bulletproof, but fT is less than 1 Mhz. There is no PNP, and they won't match well to anything out there so it's limited to quasi-comp designs. The old monster BGW amps used them. The catch is that because of the low fT, swtichoff is slow and crossover distortion can be quite high at high frequency. Not a problem for sub amps. Or for single-ended class A where the high dissipation capability is nice to have. I used them in one of Nelson Pass' old designs from the 70's and cranked up the power supply voltage (and power).
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Old 12th February 2009, 01:57 PM   #3
thomasfw is offline thomasfw  Hong Kong
diyAudio Member
Join Date: Jan 2005
Location: Hong Kong
Thank you very much for the information !

Do you think I can use the 2n2659 in JLH Class A 10w(1069) ?
or it is waste the time and better use 2n3055/ MJ15003 ?

Is it no one will use 2n3055 now a day ?

Thanks again !
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