Is your tube amp really a tube amp?

I use and love the older ARC D70Mk2 tube amp. To many people, this design is a true tube amp...however, ARC uses a LOT of transistors in the circuit. In the "day" a transistor was considered a ss device. Anyone know of a tube amp that uses NO transistors in the circuit...only tubes. I suspect that in my amp, the audio signal passes only through the tubes and not through the "ss" devices ( don't know this for sure)...Therefore, what is a TRUE tube amp...how many of us are actually using such a device ( no transistors or other ss devices whatsoever in the amp), vs. a hybrid...what's the definition of that term in regards to tube gear?