The Rt2100 uses two 12ax7 in the Preamp section with a solid state mos valve output.
With the ET65 and some tube swapping with some NOS Mesa Boogie 12ax7 tubes from the 70's
The amp actually pulls off a decent metal sound. Very punchy, crunchy, and beefy tone without fizz.
The Mesa tubes conquered the fizz, but it sounds dull and lifeless with the original speaker.
The ET65 opens it up to sound like an all tube amp.
I was trying to spruce it up to sell, but now I'm keeping it. It crunches like a boogie dual rec.
The Question is will the ET65 handle the Amp.
I could put a Retro 30-75 ohm, which I've read can handle it but I like the current set up.
I also have a HM75 I could try, it is 16 ohm, and would drop the volume of the amp solving the problem also.
Okay ... that's a new amp to me, so I had to check it out. Man, it looks really good "on paper" ... and BK Butler was the man for good solid designs around the late 80's early 90's ... so I bet that girl does sound good!
As I read the specs, the mosfet amp is 100-watts RMS at 4-ohms, and 50-watts RMS at 8-ohms ... so if the ET65 is 8-ohms it should be perfectly safe. Let me know if I've missed something!
Thanks Vaughn, I wound up settling on the HM75. The amp gets a bit bright, and benefited with stronger bass response.
I'm a bit surprised it has been discontinued. Works great in an Genz Benz El Diablo also, when combined with invader 50's in a 4x12 cross pattern fixed the fizzy tone disaster of that amp, although ET65's really shine on the clean channel of the same amp.