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I was initially interested in @hubobulous 's question but I've discovered enough now to know it can't be explained in a non-technical way.
Which is okay.
*There are some rare amps called 'parallel single ended' which have more than one power valve, but *not* working in push-pull. This is rare because it doesn't have the efficiency advantages of push-pull, but still needs larger and more expensive transformers and filtering, so is normally a bad idea. The only ones I know of are an old low-end Gibson amp from the 1950s, the THD Bivalve, and the Laney Lionhearts.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Any amp with only one of any of the conventional guitar amp power valves (EL84, EL34, 6L6, 6V6, KT66, KT88) would always be single ended.
Yes, you're right - they do have one 'power valve', as do the Marshall 1W amps too, which use a 12AU7 in push-pull like the Blackstar HT-1… but only because they're two valves in the same bottle.
For what it's worth these are the only application I can think of where the 'balanced triodes' you can pay extra for from some of the valve resellers are actually useful, because they're then effectively a matched pair of power valves.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Personally I'm a Class D sort of chap; it has the least cork-smell to it.
Not sure there has been a working example.
The idea was to switch to a higher rail for the valve when needed using FETs, however the switching circuit looked complicated to say the least.
Not sure if this would be classed as class G as you are switching the rail voltages. Maybe it's more class H....