What will raising the Va of atransformers provide?

Casouza,
I found your reply intriguing. Why would`nt a class A amp not improve with a larger transformer?
Best Regards,

Because Class A runs at full output all the time while AB varies with demand. Since the transformers already handle full output bigger ones will not improve the sound. An insight into why well designed Class A amps are so large and expensive.

Thanks, Stanwal, excellent explanation.
Class A amps are fully on (conducting 100% of the rated power) most of the time, therefore the power transformer, rectifiers and power supply capacitors must be over-specified, in order to supply the high current demand, stay relatively cool, not buzz or fail.

On the contrary, Class AB amps pass a fraction of the maximum power most of the time, while playing music. On musical peaks, a larger transformer and stiffer power supply MAY help output more peak power.

Some amplifiers are current-limited by the choice of output devices or the size of the heatsinks. In that case a larger transformer would be of little help.
I suggest that the OP contact the amp's designer for guidance.

Larger transformers will have a much larger turn-on current inrush.

Not necessarily bad, but should be considered. Maximum from the wall, even a 20a circuit is what......1800va?

For larger transformer(s) to be effective, this amp will need a dedicated circuit.

Need some more infor. What class is the amp? Listening habbits and speakers will give some idea of actual power needed.

I thought North American power is 120 volts. That means a 15 amp circuit x 120 volts will equal 1800 watts and a 20 amp circuit will equal 2400 watts. If I was going to be using close to the limit for either scenario, I would opt for several dedicated circuits.

Ciao,
Audioquest4life