I have been toying around with different amplifier circuits built around octal preamp tubes. I have a box full of EF37/6J7 tubes, and I needed something to make music.
The circuit that caught my eye, one I haven't built yet, was the Altec Lansing 323C using 6L6 tubes in push pull tetrode mode.
"The Altec-Lansing A-323B was inroduced in 1947. The amp is conservatively rated at 15 watts RMS from a pair of 6L6G output tubes in push-pull. Its frequency response is specified at 20-20,000 Hz...