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First of all Great Help in here Thank you. I had purchased 1 mesa boogie 5y3 rectifer tube 2 5y3 groove tubes and 1 5y3 sovtek. Got the mesa tubes and the groove tube the sovtek tube was backordered. When I opened the box to the groove tube they were stamped sovtek made in russia... and about...

I will try the sovtek. Thank you for the advice. I'll also post results in due time. As far at how old the amp is I am not sure how do you decifer the mesa serial number? The serial number is LS-0028xx

I purchased a second hand lonesater special 1x12. I noticed the 5 and 15 watt channel wasn't working but the 30 watt was. Took a look at the back saw the 5y3 was out. Also googled the question and got confirmation on here. I ordered a new 5y3 and replaced it with the old one. Amp worked for...