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2SA1837/2SC4793 Matching Yield?
2SA1837/2SC4793 Matching Yield?
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Old 5th January 2009, 01:15 AM   #1
jkeny is offline jkeny  Ireland
Join Date: Feb 2007
Location: Dublin
Default 2SA1837/2SC4793 Matching Yield?

I'm looking for 6 complimentary matched pairs of these transistors & I wondered had anybody here got experience in matching these? Approx how many pair matches could I expect from 20 of each?

This is for the Bias function in a Steve Dunlap Krill amp so I need 6 pairs for 2 monoblock amps.
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Old 5th January 2009, 02:10 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
what your tolerance on matching parameters? 10% or 1% or something completely different?

What do you need to match? hFE or Vbe or both hFE and Vbe @ one specific current over over a range of currents?

If you're only matching Vbe to +-10mV then a batch of 20 will probably give you 6pairs. If you change your tolerance to +-1mV at two currents the yield is likely to drop, you might get 1pair or 6pairs, it's down to luck.

If you want to match hFE to 10% at one current, again a batch of 20 is likely to yield 6 pairs.

The tighter the tolerance and the more parameters that must be matched the lower the yield.
regards Andrew T.
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