[Eeyore]

Scott Dorsey wrote:

Arny Krueger wrote:
"Eeyore" wrote in

Oh there is, but since a classic Class A output has such
high standing dissipation you use more devices in
parallel and you're actually working them at lower
currents than in A/B.

I think I saw the effects of beta fall-off in my testing. I was working
with 8 devices up and 8 devices down. VCC was about 80 volts. The devices
were complements from the MJE 1502x series.

Admittedly, one go add enough devices so that beta fall-off wouldn't be an
issue.

If you don't mind non-complementary output stages, there are truly
gargantuan MOSFETs available today for electric motor control applications.
Most aren't designed for linearity, but some careful selection may help.

I'm still fond of lateral mosfets. I've got a couple of amps here ( of my own
design in fact ) with 12 Hitachi devices per channel.

Graham