mesa/boogie ltd. new tubes?

bhitt99

New member
I have an old mesa ltd. and I can't find what exactly it is. It doesn't seem to have any identification for what model it is.
it has str415 tubes and i cant find them online anywhere.
it needs new tubes...so does anyone know about these amps?
it is old like from 70's to 80's and awsome. should i have it re-biased?
should i replace all the tubes or just the 2 big ones(one looks to be burning a hot blue) - the other small 2 seem to be fine.
what shpould i do?
i dont know much about this stuff so thanks in advance to anyone who tries to help.
 
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