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Tube Nube questions

I am beginning to roll output tubes in my Primaluna Prologue 2 . What is an average amount of time for new tubes to burn in ?

When I have a handle , after burn in , on the new tubes how long should I need to warm up the old tubes on a warmed up amp to make a fair comparison ?

Thank you .
saki70
saki70 OP
907 posts
 
Newbee;
I have it , thank you so much .
Did you find a need for a bias adjustment with tubes other than the 6L6's ?
newbee
4,767 posts
 
I also have a PL1 in which I have used EL34's - while warmish in tone, a balance I can enjoy, it seemed a little peaky in the upper mid's which I don't enjoy. I rebiased it with my tubes in place. Now it is a bit warmer in tone and no longer peaky. In all honesty a bit too warm for my taste, but that's just me. Re the PL1, I also tried several different KT88's and 6550's 'because I could' and they were unrepresentative of what I expected from them - I suspect I could improve this unit by re-biasing it with them in place but I don't need to so it will remain a mystery.

Have fun with your tube rolling - keep in mind it's all about synergy not only with your amp but with your other electronics as well, so blanket recommendations from folks can be a waste of time and money. :-)
saki70 OP
907 posts
 
Just wanted to chime in here .

Anybody who does not think that there is a break in process , with tubes , is wrong !
I plugged these new tubes in and listened immediatly , it sounded thin , vailed and lifeless . Pretty much the same at 1 hour and 4 hours .
Now , at @ 12 hours , the sound has some body , warmth and weight . It now sounds like a tube amp instead of an old cheap boom box .

Happy tunes .
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