12AZ7 as DC Cathode Follower?

[dwinstonwood]

The datasheet for the 12AZ7 states a peak Heater-Cathode voltage of 200; the amplification factor is 60; and max dissipation is 2.5W.

Sort of looks like a good DC Cathode Follower candidate. And they're not pricey. What am I missing/overlooking?

Thanks!
David

[tubeswell]

Beware the Heater filament draws 450mA @ 6.3VAC


https://frank.pocnet.net/sheets/127/1/12AZ7.pdf

[dwinstonwood]

Thanks tubeswell. OK, as compared to 300mA for 12AX7's. In a pinch I guess you could wire the 12AZ7 12.6V series for 225mA?

[tubeswell]

Thanks tubeswell. OK, as compared to 300mA for 12AX7's. In a pinch I guess you could wire the 12AZ7 12.6V series for 225mA?

If you have a 12.6VAC power supply…