do matched pair (or maybe a quad) output tubes "aged" at the same rate? - diyAudio
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Old 8th June 2007, 11:42 PM   #1
jarthel is offline jarthel  Australia
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Default do matched pair (or maybe a quad) output tubes "aged" at the same rate?

like a design I saw in Andrea Cuffuli requires a quad of EL34 per channel.

an example:

I bought a matched quad of EL34 with a reading of 100 for all 4. After 500 hours, will the tubes still have the same reading?

Thank you.
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Old 9th June 2007, 12:15 AM   #2
kevinkr is offline kevinkr  United States
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These days probably not, but as long as the bias is adjustable on a per tube basis it should be ok.
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Old 9th June 2007, 12:30 AM   #3
jarthel is offline jarthel  Australia
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Quote:
Originally posted by kevinkr
These days probably not,
Care to explain that statement?

thank you.
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Old 9th June 2007, 01:05 AM   #4
nhuwar is offline nhuwar  United States
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I think it may mean that the quality control in the construction of new tubes are not as precisely put together as they used to be.

But Kevin will know for sure.

Nick
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