Balanced Low Power Tube Monoblocks?


I'm interested in suggestions for balanced, low power (let's say 60 wpc or less) tube monoblocks.

For example, the Atma-Sphere M-60.

Power tubes other than 300B are preferred (due to the high cost of NOS 300B tubes)

Others?
tvad
Thanks Raquel.

My equipment rack is along a side wall and near the back of the room, so I run 30 foot interconnects (rather than 30 foot speaker cables). Therefore, monoblocks are preferred.
Understood. To make a final pitch for VAC's Renaissance amps, there is a monoblock version of the 30/30, called the "30/70", which is 65 watts per monoblock channel. They come up for sale on Audiogon from time to time, and the 30/30 can be rewired by VAC into 30/70 monoblocks for roughly $500 per amp. I find the cosmetics on the 30/30 || 30/70 to be a bit loud, but, like all of the Renaissance amps, they sound superb, being incredibly transparent, open and alive (assuming they're run with zero feedback).
I have Quicksilver Triode (6C33C) Monoblocs and they are not balanced. They are terrific though.