TUBES 6922 pinched waist

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?

I honestly don't know. But, I do know that any reputable tube seller will
not sell you microphonic tubes, and should exchange them if they are
microphonic. I have never purchased 6922/7308 tubes that have been
microphonic...Amperex, Siemens or Philips.

Do you know of a reputable tube seller that will sell pinched waist tubes to anybody.Some do not sell to you unless you buy their gear.