I’m using 2 mono-block tube amps I built from schematics published in 1958, from books my father had and was going to throw away. Switch Mode Power Supplies. Modern passive components. All RCA tubes. The finest amps I’ve heard. Class A 45 Watts/channel. Tube phono preamps.
The only heat comes from the filaments. Granite bases.
The only heat comes from the filaments. Granite bases.