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OK to use unmatched or different brand tubes?

My preamp has 2x 12AX7 and 2x 12AU7.
I am thinking of trying different tubes.

Would it be OK to use a pair of tubes with the same brand without testing their current levels?
How about using a pair of tubes from different brands with matching current levels?
How about using a pair of tubes from diffenret brands without testing their current levels?

Overall, if a new pair pair of tubes make improved sound, the mathing of current or brand does not matter?
ihcho

Showing 1 response by creativepart

creativepart's avatar
creativepart
156 posts
 
Power tubes are much more sensitive to matching than pre-amp tubes. But, still it would be nice if they were in the same ball park. A tube tester that can give you a reference number for each is good but not mandatory.

But in general, unmatched pre-amp tubes have not been a problem in my experience.
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