• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Stereo Tube Amp to build for my father.

Why not make El Cheapo cheaper ?
Let's get rid of a transformer, a tube and a fet 🙂
Since it's not the same amp no more we have to change the name 😀
Mona
 

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SS bolts are provided with many toroid transformers as the magnetic properties of SS are poor. This along with a rubber cushion seem to be adequate.

I would expect Brass bolts would work well also.

Copper end caps and pipe might make good looking covers and would be nonmagnetic.
 
Exactly. It doesn't matter. You can make the covers out of any material you wish. Being non-magnetic is neither an advantage nor a disadvantage.
I took your statement in #85 to imply that being nonmagnetic was desirable. This could confuse a novice reading it.