Get my Guitar found the latest prices on the Mesa/Boogie 6L6 GCSTR445 Duet Power Tubes.

The Mesa/Boogie STR-445 is a 6L6 that shares some qualities of a 6CA7 in that it has tight, articulate low-end for excellent bass definition along with beautifully balanced mid and a chiming top-end that cuts without harshness. It's a great choice for the Rectifier Series of amps for tightening low-end while adding top end cut in a perfect "Rock/Claw" frequency while avoiding "buzz" and "sizzle" in the upper octave. They're Mesa's standard tube for Dual and Triple Rectifiers and a great "swap and play" update for older Rectos.