For what it’s worth...
Comparing, re-tubing an older KT88 based amp that will "accept" KT150s vs. an amp which was designed day-1 (with larger transformers, and higher plate voltages) to natively run KT150s optimally, "can" "sometimes" yield a different listening experience. I’ve run across this with 3 different amps.
While I really enjoy the KT150s in my current mono block amps, they were originally designed to run them. Sounds great. However, a good friend just removed KT150s from his older amp, and he went back to KT88s as his amp was originally designed for them. In his case, I too preferred the KT88s in his amp. His upgrade to KT150s was a waste in his particular situation. Found out later his amp had much lower plate voltages, and (apparently) was not able to fully drive and take advantage of the more expensive TS KT150s.
It seems the amp/design/circuit has something to do with it as well. Probably worth checking with the amp designer to see if it’s worth it. A case of bigger or newer may not always be better.
Comparing, re-tubing an older KT88 based amp that will "accept" KT150s vs. an amp which was designed day-1 (with larger transformers, and higher plate voltages) to natively run KT150s optimally, "can" "sometimes" yield a different listening experience. I’ve run across this with 3 different amps.
While I really enjoy the KT150s in my current mono block amps, they were originally designed to run them. Sounds great. However, a good friend just removed KT150s from his older amp, and he went back to KT88s as his amp was originally designed for them. In his case, I too preferred the KT88s in his amp. His upgrade to KT150s was a waste in his particular situation. Found out later his amp had much lower plate voltages, and (apparently) was not able to fully drive and take advantage of the more expensive TS KT150s.
It seems the amp/design/circuit has something to do with it as well. Probably worth checking with the amp designer to see if it’s worth it. A case of bigger or newer may not always be better.