Soundhound,

Thanks for the information. This is the reply I got form the mod person.

Increasing transformer alone WILL mean increase in power because the
voltage rails will not sag during load as they would with a smaller
Toroid of the same voltage.

Case in point, the Aragon 4004's and 8008's pump out 200wpc using
voltage rails of +/- 68, yet Adcom gives out the same power using +/-
82volts why?

If your friend was accurate then this would not be possible. The thing
is, the Aragon uses 2 800VA toroids in the 4004's (1.6kva) while the
Adcom uses a single 675VA Toroid.

However that alone is not sufficient to increase the power to the levels
we are looking for. For that, I am increasing the voltage rails to +/-
87 vdc from the stock +/- 82 vdc.

Extrapolating from the Aragon (which actually clips at 240 watts into 8
ohms), if 136 volt rails (68*2) gives us 44 volts RMS, then the upgraded
Adcom will give us 44/136*174= 56.29 volts RMS or 396 watts into an 8
ohm load, give or take.

In actuality with a good power supply, to get 400 watts, all you need
are rails of +/- 85vdc. On the other hand for cheap amplifiers with
small power supplies, you would need +/- 105 volt rails to get the
same... so while voltage is one variable, current is the other.

I would appreciate your take on this explanation.

Thanks