Is it Summer yet? Don't forget to re-tube for summer gigs!
Sovtek 5881/6L6WGC Matched Quad
Sovtek 5881/6L6WGC is the factory installed 6L6 tube in many amps, including Marshall and Soldano.
If you are looking to re-tube factory installed 6L6 with coin base, 5881/6L6WGC is usually the exact replacement.