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I am trying to convert a Europe-spec 90's Fender Sidekick 15 reverb amp (sorry, not a tube amp) to run on North American power. Looking at the power section of the schematic (see attached), it seems to me that all I need is a new power transformer capable of delivering 21V center tap like this one https://www.hammfg.com/files/parts/pdf/166J20.pdf. Does that sound right?
If that helps, the part list for the sidekick series list the following part numbers, which I was not able to decrypt: Transformer, Power, F2158UC, F-168UC, F-1008UC, SK-25, 20VC, or SK-35, 30VC.

Edit:
I'm sorry, I got the amp type mixed up, my amp is a frontman not a sidekick.
I wrote
I just measured the transformer voltage on my Sidekick 15 reverb amp, that is wrong.

I just measured the transformer voltage on my Frontman 15 reverb amp.
The voltage when the transformer is disconnected from the PCB connector is 18.5VAC-0-18.5VAC.
When the transformer is connected to the PCB the voltage is 18.0VAC-0-18.0VAC.
The read DC voltage are -23VDC -0- +23VDC.

The voltages noted in the Sidekick schematic are -21VDC -0- +21VDC.
Maybe both types of amps using the same transformer.