The 6146 was used in the original Ampeg SVT bass guitar amplifier which used 6 of them to produce 300 watts. That amp had a reputation for blowing up, so they switched to 6550's in the later models. The schematic is in the book "A desktop reference of hip vintage guitar amps" by Gerald Weber. It may be on the web somewhere.
There is very little literature showing the use of this tube in HiFi applications especially SE. The tube was used in the modulator section of transmitters back in the 1950's, that is where the AF amp reference comes from. You could probably get them to work in a circuit that was designed for an 807, although the tubes are not that similar. Some resistor values would need tweaking, and the bias would need adjustment.
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