Sophia Electric New EL34 tubes

@wig , thanks, this is very helpful.  I will probably pick up a 274B to try in my PS 9.0.  So far, the Canadian Westinghouse  V-71 is the best rectifier I've come across by a substantial margin, including the GZ34 Mullard and the Philips tube that Dan Wright prefers.  Brent Jesse put me on to the Westinghouse, but as far as I can tell, these are now unavailable.  I've had two of these tubes go bad in the last 12 years or so, and I still have 2 spares, but I'd love to find a current production alternative. 
I need 8 6SN7s in my AtmaSphere amps.  I won't be spending $1600 to retube my M-60s.  Also, there is not space for more than 2 of the Sophias per channel.   I may pick up one pair to rotate through the 4 positions just to see what gives.  You've given me some good advise in the past so I trust your ears.  But those 6SN7s are mighty pricey.

@ brownsfan

Those Sophia Blue 6SN7s are more pricey than their KT88s and would recommend trying a pair of 6SN7s in your most critical position in your pre-amp and after complete burn-in, try in your amp.

I saw an add on this site offering a 10% discount but would recommend contacting Sue at Sophia Electric to see what they can offer you. Hopefully, at some point those Blue 6SN7s will come down in price and that will entice a lot more buyers.

But, if your Amp utilizes KT88s, that would be the best place to start and would yield better sound quality across the board and a little cheaper.

Wig

I must admit as much as I like the Sophia EL34’s in my Aric Audio amp those darn Gold Lion Kt77’s just sound right. I have been going back and forth with these two and also trying different 12au7’s. Damn, this is fun and the sound quality is fantastic. Aric’s amp and preamp are what makes everything RIGHT.