Best 6sn7

Agreed the front most tubes will make the most difference in those amps. Generally in any tube circuit the one(s) with the most gain will have the biggest effect.

VT-231 is simply the military designation for 6SN7GT - no real special meaning other than that. some think the vt-231 types sound different, most notably this may be the case with Sylvania but I have heard of it on other types too. Generally the vt-231 designation is more in demand from buyers so if you have to have that designation you will pay more, but likely get the same tube as the consumer version.

All the ones mentioned are good chioces. personally I prefer the earliest GT types, rather than GTA, GTB, etc. some WGT and WGTA are also quite nice.

Let me know if you need some, I have a collection of a few hundred and can part with a few, I think I still have an ad up listing some sample prices/types. (have many more than just those in the ad which are mostly all sold now anyway)

thanks
-Ed

Sugarbrie -

I have tons of VT-231s, for both keeping and sale. (let me know if you want some). Generally my thoughts regarding them is the difference in sound between GT and VT-231 is minor at best. I am happy to supply VT-231 to folks, the demand (and thus price) is higher, which is fine with me. But bang for the buck, the regular GT version is just as good IMHO.

Re: ratings - agreed. But mostly the point I was making was labelling.

Correct re: TV's. GTB also had series filaments, and controlled warm up (11 seconds warm up time).

-Ed