Can’t use any other tube??!!?


I just got a used Rogue Cronus Magnum 2, and I want to roll a few tubes I have into the center 21au7 spot to see if I can beat the stock JJ.

Every tube I try is noisy - crackling and hissing. Even tubes that I take from another amp where they are crystal clear.

But when I put the JJ back in - it’s quiet again.

I have tried new production Mallard and two different NOS Mullards.

Any ideas why only the stock tube is working? 


stephenjess

Showing 1 response by oddiofyl

Agreed.... my preamp is very sensitive to noisy tubes.   I have a JJ 6922 in there now.   Just put a brand new Gold Lion in,  noise.   The Gold Lion tube is dead quiet in amp but rush in pre. .   So i put the JJ back in.   Sounds very good,  not quite as good as the GL...still sounds really good, just different .   Im going to order a super low noise tube .....