Upgrading tube for a MAC 275 mk5 what are you using?

DeKay,

thanks for that information that’s very helpful. the tube store has some RCA’s on sale right now i may pick up a set to try out.

I actually have a few Amperex 12ax7’s in my house i may try in the amp/preamp. I agree i like these tubes as well.

also, my amps are Mk6 current production not the mk5. mistake sorry not that it makes much difference. 

thanks for the suggestions.

glen

I'm personally thinking NOS tubes, I've tried the gold lions in other tube types (300b,12 series small signal tubes, kt66, etc) and yes, they can be good.

I'm really wondering what NOS tubes people have tried, I've not used 12AT7 before so i'm not really sure which are great specially for the money ( i'm not paying $300 each for telies for example). I still want over all good sound from top to bottom but i'm looking for more midrange tone and sound stage depth and width. I find the JJ's if that's what Mcintosh is still using to be lacking in midrange tone and sound stage they are quiet, decent bass and decent up top if not a bit bright. But not like many of the NOS tubes I own. 

Also, anyone using 6550's opposed to the KT 88's? I find the KT series to be overall leaner in the midrange compared to other NOS types. 

DeKay,

Interesting about the Ken-rads I also have a set of triode labs 2A3 mono blocks I really like a set of NOS RCA grey plates I found. They are one of my fav NOS tubes right now for 2a3, supposedly the black plates are even better but I've not heard them. The greys are rather balanced sounding with very good bass control and detail. not rolled off on top and of course supper midrange. much better than any new production tubes I've tried.