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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?
128x128ihcho

Showing 2 responses by ihcho

ihcho's avatar
ihcho OP
609 posts
 
Thanks.
I will get 50's used Tung Sol and GE 12AX7s. They are individually tested as working, but the seller did not do test on their signal levels and how close they would be matched.
I don't have a tube tester. From reading the responses, at least using both may not do any damage. I'll see how they perform compared to the Chinese tubes.
ihcho's avatar
ihcho OP
609 posts
 
They are used but tested as like new. So I would expect they are in good shape with their original condition, or close to be labeled as NOS. I spent more than a dime ($8 with shipping), so not a big deal. If they produce less quality sound than the Chinese tubes, I will find another Tunsol or GE 12AX7 and see if they would match better.

Thanks for all your thoughts.
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