[sdiy] Transistor help

[James Patchell]

I guess you could say that this is the mark of insanity...doing the same 
thing over and over and expecting different results... :-) ....the only 
reason I go through the exercise is that who knows...there could be an 
oddball in there...I don't know...until I test them...then it is too 
late...I might as well select the pairs to be as close as possible since I 
went through the exercise...I keep on saying I won't bother testing them 
the next time...but I always do...

At 10:33 PM 4/27/2005 +0100, Rob Keeble wrote:
>Hi,
>Whats the point of matching transistors (in expo converters and ladders),
>beyond 2mV?
>Is there really a sonic difference? Do we need expensive 0.5mV matched
>arrays or just transistors from the same batch?
>
>Emperors new clothes? Or State of the Art?
>
>An E-mu Systems Resonant Filter I have recreated sounds better with
>unmatched 2N3906's rather than a dual transistor pair (as per the
>original).. any thoughts guys?
>
>Regards
>Rob
>www.emulatorarchive.com
>
>
>One thing I have noted about modern batches of transistors is they sure
>seem to be all very similar...I generally match about 10 pairs at a
>time...out of 20 transistors (generally 2n3906) I always get 10 pairs...and
>all of the transistors are within about 2mV of each other....30 years
>ago...it wasn't like that...as I recall.

         -Jim
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