5150 Tube Test - JJ - Ruby - Sovtek- KT88 (OMG)

I know, but honestly I have had them in there since I got it, and the guy before me had them for 2 years that way. They seem to be fine. I have read all the stuff from FJA, Eurotubes, and Peavey on the subject and no one has come to a conclusion as to whether its bad or not. I don't really run the amp at super high volumes, but I take care with it for sure. I have talked to hundreds of guys online that have been doing the KT88 thing for quite a while and no one has had any issues.

I dunno why, or how but it seems to work ....lol

The math doesn't support the idea I know, neither does the words of the "gurus" but it seems to work.

Yeah you should be alright, at the most you are just shortening the life of the power transformer.
 
So it seems most of you chose the KT88 with the Sovtek as the runner up

Tube Details: (Revealed)

Sovtek 6L6WXT+ #4
JJ 6L6GC #1
Ruby 6L6GCM-STR #3
JJ KT88 #2

Also updated the OP

I will let you know its not recommended that you run KT88s in your 5150 as it can fuck things up according to Peavey and some of the "Tube" gurus online.

USE THEM AT YOUR OWN RISK!