Which tubes would you recommend?

The Mullard 12at7wa also known as cv4024 is very popular. I believe I read Kevin Deal of Upscale Audio said it is the quietest and most robust in this family. It also has a nice tube sound that's not too tubey. My favorite.

You can get NOS ones on Ebay for about 35 bucks a matched pair.

consider a ge 5751 black plate in lieu of any of the above. a second choice would be a ge 5814 black plate. choice three would be mullard 12ax7 longplate.

one of the best 12at7 tubes are the Amperex Bugle boy .May be other big names too but to me this ones the all around best for the $$$

With all due respect...the $35 CV4024 we have would be for the top grade and will have the tightest triode balance, lowest noise and hum, and tested for the highest gain line or phono stages. Each tubes is measured in circuit, and listened to with headphones.

So the princely sum of $35 ain't much. Certainly not a profit center here at Upscale Audio.

But they are the best made 12AT7 ever so even if you do buy off E-bay or "The 99 Cent Store" you may be OK.

Cheers....

Kevin Deal