TUBES 6922 pinched waist

That's good advice from 4yanx. An option to the pinched waist are white label Amperex 6922 PQ made in the USA during the 60's.

Thanks Are the 7308 PQs any better sounding then the 6922 PQs

My experience with the 7308 and 6922 tells me the answer is no.

Here's a link with one man's comprehensive viewpoint.

Joe's Tube Lore

The 6922 PQ's that Tvad references are top-flight, IMHO

Tvad,I have been to that site and thats what turn me on to the pinched waist tube.He says the pinched waist is Yeow! My reference tube.He goes on to say the shape of the tube helps reduce microphonics,quite the contrary to some of the post.Are the chances of a pinched waist tube being microphonic any greater then a 6922 PQ?