I am in the market for a $ 5-6 k monoblock amplif

Rogue Audio M-150 or M-180. 4 x KT88, 2 x 12AU7, 1 x 12AX7 per amp. KT90s are used for the M-180.

Check out the Stereophile review, though I think the reviewer goes a bit far in his comparison to SS amps. The Rogues have the silky top and dimensionality that one looks for in a tube amp, but also have excellent bass control.

The specs on ML's site seem to indicate that the Source would be fine these amps.

"5 Ohms, 1.6 @ 20kHz. Compatible with 4, 6, or 8 Ohm rated amplifiers."

Get some Wolcotts (on used market)....killer on stats. Do some research on them.

I have the Herron M1 Monos and they're fantastic. There are individuals on this board that use them with their ML with fantastic results. Give them a try and you will not be disappointed!

I second the Rogue M-150 (used about $2,400) or preferrably the M-180 (about $1,100 to upgrade M150's). I used the M-150 and about a year ago upgraded to M-180 with the Logan Summits. I am very pleased with the combo. I would consider saving some money on amps and use it to move up the Logan speaker line.

I would likely buy the Clayton M200 or M300 Class A mono amps to drive thius electrostatic speaker. Maybe if you peruse the used equipment areas you can find them in this price range.

Greg