Equivalents for 12AT7 and 6N11 ? (Sense G3 headphone amp)

[ChrisA]

I have found this schematic, but my unit is a Sense G3, not a Phenix G3. I am going to trace the circuit for possible differences.

Notice that the schematic you posted does have a global NFB loop (output is run back to the grid of input tube) while the Jones schematic does not.

 

[pingfloid]

Hi ChrisA. Yes, that schematic have a NFB loop. I still haven't verified the actual schematic of my amp.

Mr. Alex Cavalli adds a potentiometer to achieve different levels of NFB in order to adapt to headphones of different impedances. It is called " The Cavalli-Jones Amplifier ". I will try that modificacion when I have time.

The Cavalli Jones Headphone Amplifier

An externally hosted image should be here but it was not working when we last tested it.

 

[ChrisA]

Mr. Alex Cavalli adds a potentiometer to achieve different levels of NFB in order to adapt to headphones of different impedances. It is called " The Cavalli-Jones Amplifier ". I will try that modificacion when I have time.

I was bread boarding a small stereo amp and had the NFB rigged as veritable. I had the idea that it should be user controllable somehow. I was thinking of using it as a volume control. I'd remove it if the amp needed to play loud and switch it back for lower level and more critical listening. I've not built that amp yet in a real chassis and just might make an NFB switch.

But watch it or you sand up with something like the guitar amp I built with eight knobs on the front panel.