Switching from KT120 to 6550, just plug&play or dial back bias?


Hi everybody, 
looking for some advice here. I would like to try out before mentioned...would you:
just plug&play, while monitoring the bias on one/two ?
OR
dial back the bias, run for 30mins and adjust coming from the lower values?


Cheers
brxl
brxl
Thanks a million, will report back if I felt there was a sonic difference,

cheeers
brxl
Audio Research VS115


yes, turn down the bias to about 50-60% of what it was driving the kt120’s, and then insert 6550/kt88, then turn on, wait 5-10 min, and bias up from there to the target 65 mv across the test resistor

https://forum.audiogon.com/discussions/audio-research-vs-115-bias-adjustments

a good reference post for you, op  ^^^^