6L6 GC STR 420 tubes for .50 cal

[cyoung]

My original 6L6 tubes had been replaced years ago. My amp has been sitting in a closet for years so I decided to take it out and give it an overhall. I found the original tubes which are 6L6 GC STR 420's. Can these still be bought or is there an equivalent pair that can be bought, from say tubedepot.com??? I just don't know which ones to get. Like I said I'd like them to be equivalent or better.

Thanks,
Craig

 

[cyoung]

Ok, I found some additional info. I should have went to the Mesa page but it shows that the 6L6 GC STR420 were replaced by the STR440 tubes. I think I will get the STR 440 tubes.

Thanks.

 

[igfraso]

The Mark IV was designed around the STR 420.