Where's the "High Voltage" disclaimer
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The average Joe who knows who to work with and takes the proper precautions with working around b+ voltages won't have problems, but people who don't know enough to not be putting their hands/fingers inside a hot amp are going to learn a lot real quick.
Good with hands, and also good with probes.
It's not just the electrocution thing. I wasn't really thinking about that. It's trying to figure out the problem, in the first place. Without special test equipment. For example, if your Dyna stops working, you can check the tubes, and possibly replace the capacitor can if you see it is leaking. You can turn the amp upside down, and visually inspect the wiring for faults, etc. It's all very simple.
If, on the other hand, the FET controlling the triac that modulates the voltage to your 'magnetic field' amplifier's transformer starts to intermittently fail, that's going to be tough for the musical loving dentist to figure out, on his own, with just a Fluke.
But you are correct about building the amplifier. Raw assembly can be done just as easily (or almost) as with tubes. When SS was in its hi-fi adolescence, long before everything was stamped out in a factory in Malaysia, one could buy fairly high-powered SS kits. Dyna made them for several years. Jim Bongiorno's Ampzilla kit was famous. Marshall Leach designed them. I'm sure there were many others.
I know you can still get plans and parts. A few full kits are out there, too. If I needed another amp (LOL) the little Akitika would be something I might try.
Akitika's GT-102 power amplifier kit delivers 50 Watts per channel into an 8 ohm load with low noise and low distortion. The kit supplies everything you need to build great sound.
www.akitika.com