This is a valid question, but it could be reframed this way: a "matched" set of valves is matched (in some yet undefined way) when new. How much does this "matching" change as the valves age? As you can see, this is too broad a question for anyone to answer. Way too many undefined terms and even more unknowns and unknowables.
If you could narrow the question to very, very specific circumstances, folk might be able to comment with their personal experiences. Lore, not data, but we really couldn't expect more.
All good fortune,
Chris
If you could narrow the question to very, very specific circumstances, folk might be able to comment with their personal experiences. Lore, not data, but we really couldn't expect more.
All good fortune,
Chris
There's no guarantee that tubes age at the same rate under equal operating conditions.
I've seen matched pairs differ when re-tested after 500h of operation.
I've seen matched pairs differ when re-tested after 500h of operation.
Yes, providing they are same brand and correctly matched( matched at voltages used )
Probably not & it won't really matter - you probably won't hear the difference. Also depends in what application & the circuit of the amplifier. As Chris said there's too many what if's & whathaveyou's. Also what do you mean by matched? How many valves?
The main problem is the way you match the tubes.
If you run on the standard tube tester the results can't be relistic also after some hour of job.
With dinamic tests with Roe tube tester or Sofia or MuTracer you can check them also changing the paramters to take to the limit the test and this is a right way .
But for each tube you have to spent time
Walter
If you run on the standard tube tester the results can't be relistic also after some hour of job.
With dinamic tests with Roe tube tester or Sofia or MuTracer you can check them also changing the paramters to take to the limit the test and this is a right way .
But for each tube you have to spent time
Walter