[Jukebox-list] Seeburg MRA1-L6 AMP question

I just finished installing a replacement cap kit in the above-mentioned amp. It is being used in a M100C. Using a redhead cartridge (with good needles) I'm finding the output of the amp is poor. Even with the volume maxed the output is nominal.

I tested the tubes and the 6V6 drivers only read in the 50 percent range. A couple were 51 -52 but still low.

Do you think a fresh set of tubes will increase the output?

Regards, Rick