Ship Of Theseus: compatible, interchangeable amplifier modules

I will try...
First Watt Amp requiring 24V DC are using transformer with an output voltage of 18v (AC, RMS). Peak output would be 18*sqrt(2)=18*1.414=25.45volts. Then the bridge rectifier is taking something like 1.6volts to give 23.85volts.
For F5 Turbo V2 https://www.firstwatt.com/pdf/art_f5_turbo.pdf 48Volts DC is needed, 36volts @transfomer output is suggest. (36*1.414)-1.6=49.3

So, if i were to using transformer + bridge rectifier + bank of caps, i would go with a 28volts @output transformer (28*1.414)-1.6=37.9 volts.
[26v output would give (26*1.414)-1.6=35.16, might be too low?. Bridge rectifier voltage drop increasing with current, one might use 2volts... hence 28v transformer]]
There are websites to do a betterwork than that i remember.

That's what i learned / think i have learned.
If mistaken, please tell me! [i might have misunderstood "how large"... If power rating, then yes, i have misunderstood]
 
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Recommended smps for the amp is 150watt.
Linear psu is less efficient but 200watts should cover the difference.
Yet, given the price difference between 200va and 300va is relatively small, i personnaly would go with 300va.
More freedom if re-used for a later project, but that s me.