It is wellknown that pushpull amplifiers disintegrate when powered up without a load. No load equals infinite load impedance, which transformers itself to yet a higher load impedance to the anodes of the output tubes. The situation with infinite load impedance often leads to a situation where the slightest imperfection or lack of balance triggers an oscillation that rapidly takes out the tubes and often the transformer.
But what happens if the transformer is loading the tubes on the cathode side? Will the same happen?
Typical circlotron, that's waht this kind of amplifier is called: