Music Man amps?

I have no experience with this and can add very little other than this video which literally came out just a few days ago. It's pretty cool!

They are built like tanks. All top-quality components and heavy. They are great for loud and clean.

If you're a home player, this amp would be way overkill for you; you'd never be able to play it dialed up to the volume where it really starts to sing unless you use an attenuator.

Where is this amp located? 

I know I said they were quite pricey here, but I didn't realise how much. I've just had a look on eBxy, and there's a fairly tatty looking RD50 1x12 listed for £1,250 

If the price is reasonable, it's a worthwhile gamble. These are great amps. I doubt you'd lose any money on it ultimately.

Wow! If it winds up being what it seems to be, that will be killer.

I had one for about 12 years. Great amp. The OD is very good on the RD model. Even at slightly louder than bedroom levels.

I also had a RP112, loved the phaser. This one has a phaser channel instead of a distortion, so needed to be driven pretty hard to get sweet.

Both amps took pedals well. Played live with them weekly.

I believe there were several different MusicMan circuits used over the years when the original company was active. This is what I recall from amp catalogs and interviews ..... but it was along time ago, so who knows how accurate my old memory is !

The first models, as used and endorsed by Eric Clapton included the HD One Thirty and HD Sixty Five amps (spelled out in script on the amps) in heads and combos and used EL-34's and a 12AX7 as a phase inverter. Volume and master volume controls could adjust the solid state preamp gain/distortion and a High Power/Low Power switch did a bit to regulate power amp influence on the sound.

Then, I recall, they came out with the RD and RP series heads and combos rated at 150 and 65 (then 75 ?) watts. These used 6CA7 power tubes (a "cleaner" and stouter American version of the El-34, and I believe reportedly used by EVH in his Marshall head) These series amps had a solid-state phase inverter and preamp, still had a High Power/Low Power switch and used Gain and Master volume controls to adjust basic amp drive. The RP featured a Phaser and the RD featured a vibrato and more focus on the Gain channels.

Finally, late in their initial companies existence, they came out with the RD50 series, initially in 1-12" and 1-10" combos and I think heads later became available. These were "Boogie" style competitors and had 6L6GC power tubes and a 12AX7 "tube limiter" circuit in the pre-amp. I am not sure whether the phase inverter was tube or solid state.

The first series with tube PI and EL-34s as well as the final RD-50 6L6 series with the tube limiter circuit seem to have the best sound reputation, but all MusicMan amps are pretty highly regarded as well built amps with excellent sounds and fine platforms for pedals.

The “RD” has distortion. They had another version that had a phase circuit. Don’t expect a fabulous distortion. Music Man I was really known for superb cleans. I actually preferred them over Twin Reverbs back in the day, but twins were more readily available.