Quicksilver V4 tubes

The Mid Mono has had three revisions and the early ones can not use the big KT tubes.  Mike told me not even to use KT 90 on my second rev Mid Monos.  

I would contact him.  He is a straight shooter.   

In the Mid Monos I preferred KT77's. Mike actually recommended them to me.

Yea,  it’s been a while since I had the KT88’s’s in my amps  I had thought about doing this a while back and initially Mike said to me that because the newer V 4’s before they stopped manufacturing them had updated transformers to accommodate the bigger KT 120 and KT 150 tubes! so naturally, I was a bit surprised to see that he had said to someone else that you can use the other tubes and older V 4’s as well as his message back to me, which I have included here!

The older V4s can use the KT150s however I feel the Chinese KT88s sound better than the Russian ones. 

Mike

Tung-Sol is the only manufacturer that makes the KT-150 and the KT-120. It will not be easy getting these or any other Russian made tubes. I have used the JJ KT88 tubes with my QS amps. Take a look and you will see that the Russian tubes are not available!

https://www.tubedepot.com/t/tubes/power-tubes/6550-kt88-kt90

Chaps, you can't willy-nilly swap tubes of the same pinout: Filament currents vary from 1.4A for the KT77 to 1.7A+ for the KT150.

Power is calculated from B+ and the current available. Changing from KT77 to KT88 will not provide more power. It will sound different due to the transfer function of the drive vs the tube power curve non-linearity. Along with the mismatch inherent in ALL tubes of the same type.

IGNORE ALL recommendations for a specific tube from Joe AudioPhool unless he has the same equipment in the same room! AND listens to the same program.

Myself and another really like the JJ KT88 in our M-125 monoblocks. He has Klipsch and I have custom ET LFT8b. I've never heard his system and he's not heard mine.

Apex Matching is really good.

See ieLogical Rolling for more on matching and aging.