I have tried a large number of various 6SN7S in a several different circuits and have found the GT compatible. I have a great deal of respect for Almarg and his engineering approach to system compatibility but my experience differs. That said I happen to agree with his choice of Sylvania GTBs (green lettering ) and the performance and bargain price of GE GTBs. The truly NOS GEs,can be bought for less than current production. If you have a bigger budget there are many depending on the sound you want. It's very subjective, for instance Almarg didn't like CBS, there are two distinct periods of that tube the Hytron, and the CBS Hytron/CBS. The sound is very clean and probably the fastest/quickest 6SN7 I tried. I favor Sylvania and use the 6SN7W often. A short bottle version can be had for $50. Other types are less in most cases. The Ked Rad is the bass king buy the clear glass sounds the same and you'll save money. You'll hear a lot of recommedations for Tung Sol round plates , yes they are excellent but good examples wildly expensive.
12AX7s are getting very scarce as old stock tubes and seem to be coming as worn and used despite NOS test.. I would approach with caution Best bet for an old stock tube that will perform is Telefunken. Fortunately there are some very good current production. Tung Sol, Mullard, and Gold Lion as well as JJ etc.
What are you considering?
12AX7s are getting very scarce as old stock tubes and seem to be coming as worn and used despite NOS test.. I would approach with caution Best bet for an old stock tube that will perform is Telefunken. Fortunately there are some very good current production. Tung Sol, Mullard, and Gold Lion as well as JJ etc.
What are you considering?