What causes a tube to "sing"?

I just ordered 2 matched pairs of Genalex Gold Lion Gold Pin versions of 12AX7s and 12AU7s

Looking forward to hearing how much better my Pre can sound with better tubes in it.

Thanks for the help and suggestion!
 
Shadowfax said:
I just ordered 2 matched pairs of Genalex Gold Lion Gold Pin versions of 12AX7s and 12AU7s

Looking forward to hearing how much better my Pre can sound with better tubes in it.

Thanks for the help and suggestion!
Click to expand...

Brian.......Good move. I think you will be pleasantly surprised at the improved performance of your VAC preamplifier. That is too nice a component to be using marginal tubes in it. Looking forward to your impressions. Remember, it will take the 12AX7 and 12AU7 tubes approximately 40 to 50 hours to develope their permanent voice. Until they are fully broken in keep the VAC in the mode that operates all the tubes at once.
 
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