Tube DIY Asylum

RE: Funny coincidence...

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In Reply to: RE: Funny coincidence... posted by Gordon Rankin on May 10, 2024 at 11:03:57

My 211 project goes back many years. The prototype started with a 10V filament transformer, but I couldn't get rid of the hum. DC didn't seem to provide the same sound quality as AC (I tried linear and switching supplies at the time), so I eventually used ultrasonic AC. This turned into a project of its own, and it consumed many hours of experimentation and construction work. The supply is detailed in the thread I linked at HiFi Haven. You might have to join the site to see the images.

These are monoblocks, so like yours, they have separate power transformers. I also use a separate transformer in each amp for driver B+, and a third transformer to supply B- at the bottom of the driver choke. These separate supplies resulted in a very smooth transition from A1 to A2. I can see it on the front panel current meter, but virtually no change in THD/IM at the crossover.

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