Wow 10Hz, what do you drive with that? You're getting almost into DC
I'll have to check those out.
I have a 6L6 12" combo that's home brewed from a Knight PA amp with a lot of tone mods. I also built a low power Marshall style head and 4x12 slant cab based on the "November" design on the AX84 DIY site. It only uses EL-84 tubes in a PP configuration, but it's plenty loud for at home use.
I sold my 1983 Gibson Les Paul custom Black Beauty a long time ago, I still kick myself for that one.