classe twenty five and classe fifteen

I don't doubt you had a bad experience with the DR-10. You don't say what speakers and other equipment it was mated with. Proper matching is everything. I've been in this hobby for 40+ years and have owned more amps (tube and solid state, mid-fi and high end) than I can count on the digits of both hands and feet. Not one of them ever came close to sounding like an AM radio, not even the Phase Linear 400 Series 2 that I have in my collection. Peace.

I OWNED THE 15, IT WAS A LITTLE LACKING IN THE BASS COMPARED TO OTHER AMPS I'VE OWNED BUT IT WAS A REAL NICE AMP BUILT LIKE A TANK. THE PROTECTION CIRCUITS ARE VERY SENSITIVE, IT WOULD SHUT DOWN WHEN USING TUBE PREAMPS SO I HAD TO SELL IT, IF YOU DO NOT MATE WITH TUBE PREAMP IT IS FINE!

I run the 15 amp with a tube preamp, specifically a Modulus 3A preamp. I am very happy with the marriage.

Hey, Brf, I think the biggest change was the face plate (removal of DR from all model names) that would be the most obvious to most people. (Even the next gen of Classe (when the Fifteen change to the CA-150) was the same amp.

I like this Classe series and still own a Fifteen. Thought the bass is great, the mids and highs lack allot of detail but still sound okay, but no match for the inter detailed mids and highs from Krell of the same vintage. just mho.

The difference between the 15 & 25 are that the 25 has more pairs of output transistors.