If it's anything like some of the old blackface amps you might be able to get some more drive and grit without the volume. With my '67 Super Reverb tone controls down at 0 and the volume up to 7 or so, the amp is almost silent. Then starting with the bass, I turn it up to 2 or 2 1/2 and you can hear the amp start to come to life. Adding mid and treb to about 3 and I have a nice driven kind of tone that cleans up with the guitar volume, but it's not crazy loud ~ I find the lower powered #2 input really useful too
In any case, looks like a keeper to me ! Enjoy it