Thanks zz, it all looks that the circuit configuration of the Conquest amps is not that sensitive to matched pairs, I am getting Sophia´s tubes since we had some doubts on the KR ones.
Good morning,
The carbon plate tubes do NOT work for me [Tone].
I use & love the metal perforated plate 300Bs. They call them mesh, but that is actually wrong. I have 3 different tube names & they all have the same internals; although some are globe & some are bottle shaped glass. During your tube research you may have found that the Sophia tubes come out of a factory that produces many different names - my opinion is: same tubes if they look identical [maybe Sophia has different matching].
Please clean your New tube pins with 99 - 100% alcohol [allow to air dry] before installing. Do not accidentally flood the base.
I hope you are able to buy locally so that if you have a tube problem, you can easily return them. I personally would have a concern if one tube ran extremely bright & the other was dim. If there was a little difference in brightness it would not concern me [personal opinion - please do your own research].
Best to you,
zz.