Tube rolling with Quicksilver Mono 60s -- from KT77 to KT88? KT 120? etc.

hilde45
No one has said a word about KT90s....

Bleh.  Stay with GL KT77s or for your upgrade, go with GL KT88s or TS KT120s instead vs. KT90 IMO.   

@decooney
Thanks for the information. I wonder why the manual says that the KT88 can be used? BTW, I use the KT88 with my QS Silver 70 amps and Mike told me that can also use the KT 150 if I wanted to give them a try. This is from the M120 manual! 
Tube Complement 1 - 12AU7, 1 - 12AT7 2 - KT88 or KT150

Watch the highs on the GL KT88s.  The bass is good, but really tiring, harsh highs.  I tried them for close to 100 hours and gave up,  IMO they were never going to change enough to be keepers. My small tubes include many of the vintage ones mentioned above, for power tubes I roll el34s, kt 77 and TS 7581a. If you’re amp can use the 7581a give them a try first. Bargain price and an excellent overall power tube. Worth a try for a minimal investment.  Great base and mid-range, with highs that are extended without the harshness of the 88. 

@decooney
Thanks for the information. I wonder why the manual says that the KT88 can be used? BTW, I use the KT88 with my QS Silver 70 amps and Mike told me that can also use the KT 150 if I wanted to give them a try. This is from the M120 manual! Tube Complement 1 - 12AU7, 1 - 12AT7 2 - KT88 or KT150

@yogiboy
Not sure I’ve helped. Re-check with Mike for sure with your friend’s 120 amps. This is why I say to contact him, have your friend give him the serial# on the amps and ask again. I’m not sure if he tweaked the plate voltage up on mine at some point for the KT150s. Maybe your friend’s amps are okay with 88s. Yes, the "120" manual shows KT88s in two places, and I challenged him on that too. Note: check the front of the web page on the Mono 120s shows only this now "2 KT120 or KT150 outputs". KT88s are no longer listed there for Mono 120s. Manual needs updating, I don't know - better to ask mike on your buddy's version of the Mono 120s, mine are 2019 version. 

Yes, the older Silver 70, 80s, 100 amps seem to be fine to run the KT88s as I understand it, smaller transformers, likely lower plate voltage (supposedly). Same with hilde45s Mono 60s, ideal for KT88s, the sweet spot. I’d also buy a quad of KT88s right now if he’d say it’s okay for my specific mono 120 amps. I won't ask him a 4th time :)  

@glowworm -- harsh highs with GL 88? Whoa. I don't need that. Not just to play around.