[Amps] Stability of amps

[john.brewer at us.schneider-electric.com]

>>>>From time to time, we get back to basic arguments that involve philosophy of design.  Many
years ago, I remember that Tektronix often designed their scopes to use tubes from certain
manufacturers, and found that other brands were not suitable.  In order to meet their
specifications, they insisted that certain brands be used in certain positions.  And, if the
tube was replaced, the tube needed to meet design specifications.  Was that good engineering
practice .....? <<<<


Hi Collin!

Unless someone took the time to document why it was (with numbers) the one tube worked and the
other didn't , then I'd suggest the answer is "no"... it's not good engineering practice.
Unless you fully understand the difference between the two, can quantify it and put it in the
specification, you'd have not guaranteed that the next lot of tubes from the GOOD manufacturer,
would not suddenly stop working.

John K5MO








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