Anyone compared 6922 Sovtek & Electro-Harmonix

I think the Electro Hamonix 6922 tubes sounded pretty darn good for the price. But in a preamp that operates in pure Class A, they don't last very long and that is their achilles heel.

I wish the JJ E88CC was a better tube. Also unreliable and they become noisy in short order.

I was told by the previous owner of my Symphonic Line tube pre-amp that he had rolled several different kinds of tubes in and out of it, and that despite trying tubes significantly more expensive, the EH 6922s sounded the best in it.

So that's what I'm using, but I'd be interested to know of anyone's experiences with other tubes in this pre-amp.