Nuvista Tubes - General

I also don’t really see DC coupling as a benefit in an amp

That's your opinion, listen to a good direct coupled amp, say Gryphon/Krell ect, then listen to it with the best cap or transformer you can get inserted somewhere in the signal path.

For the most transparent sound, the best cap is no cap, and the best transformer is no transformer.

Cheers George

George, we will agree to disagree on cap coupling. I don’t see how taking a circuit that is optimized for direct coupling and hanging a cap on it is a test of anything.

I do listen to a friends Krell Monos and have owned Krell amps in the past, so I am familiar with them. I am just not as bright as you and don’t know if the excellent sound can be ascribed to the DC coupling or some other aspect of the circuit design.

I do build tube amps and will certainly agree that all caps, and all transformers have unique sounds, and a straight piece of wire does not. But if one wants to work with tubes, there are going to be caps somewhere in the chain. And I don’t diagree that the best cap is no cap, but sometimes the additional DC management circuitry involved makes it a bit more than no cap.

Hey, on a more important note, I was editing my post above as you were posting. Can you have a look at my question about the Nuvistors in your link. I would appreciate your guidance.

George, we will agree to disagree on cap coupling.

That’s why there’s so much rolling goes on with caps as they all have their own coloured sound, the best cap is no cap for the ultimate transparency..

DC management circuitry involved makes it a bit more than no cap.

It's a know fact, that DC servos are much more transparent than cap coupling.


Cheers George

George, I didn’t know that fact apparently.

Can you give me some insight into the glass cased Nuvistors in your link regarding my question above?

Can you have a look at my question about the Nuvistors in your link

I maybe wrong but I think Anthony Michaelson went to the Nuvsitor when the Trivistor became hard to get, in bulk, or the other way around.

From what I was told by a distributor, he’s known for loitering around military surplus auctions, where he can buy a pallet load of a part for next to nothing, then goes home and designs a specific number of editions using that part.

Cheers George