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Old 13th June 2005, 07:15 AM   #1
Danish is offline Danish  United States
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Default Matched transistors in Threshold SA/_e amplifiers?

This question is for Nelson:

I have a few of the Threshold SA/_e amplifiers (SA/12e and SA/4e), and was wondering if the TO-3 output devices has been matched in any way when these amplifiers were produced? If yes, could you tell me what the matching process and criteria were?

I see no markings on the output devices, so that made me curious.


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Old 13th June 2005, 09:07 PM   #2
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They were tested for gain (there was a minimum acceptable
current gain) but not otherwise matched. Matching was
not required for performance, but gain was.
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Old 14th June 2005, 01:11 AM   #3
Danish is offline Danish  United States
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Ahh, that makes sense. Thanks Nelson
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