One last question concerning the neverending Sylvania-classification - I have to ask since all info I can find is based on the WGT
B-Chrome top...:
JAN 6SN7WGTA-chrome top or JAN-CHS-6SN7W-chrome top ??? The latter should be the better purchase or do I misread
@UntilThen ´s post?
You're confused indeed.
Let me just narrow it down to 3 Sylvania 6sn7s for you, even though there are more variations. Let's keep it simple for you.
So the 3 are:-
Sylvania 6sn7w
This is simply called that, even though it has the chrome top. The chrome is implied. This tube is supposed to be the lieutenant to Tung Sol 6sn7gt black glass round plate. It commands respect and your wallet. Beware though, the top end is very revealing so are the other frequency range. The hype is justified. This is a very good 6sn7.
Sylvania 6sn7wgt
This is the one with brown base. The wgt signifies that it's a rugged tube made for the military. Amongst all the Sylvania, this is the least bright. Generally I consider Sylvania 6sn7s bright but in a a good way. Like a bright Autumn's day. It lifts Winter's gloom, that's another way of putting it. Anyway back to these brown base. Less bright, drier tone, wide soundstage, pretty solid bass, a tone that is more opaque than transparent. If I need to dial down on the brightness in my system, I'd use this driver. A more extreme version would be the RCA 6sn7gt vt231 smoke glass. The brown base is no where near the warm and lushness of the RCA. I'm describing the RCA so you get an idea.
Sylvania 6sn7gtb chrome top
Now this is the gtb version and often tag with the chrome top labelling even though most Sylvanias have chrome top. The gtb are the latest incarnations of 6sn7 and is the most widely available and cheapest. It is very good value though. Tung Sol, Raytheon 6sn7gtb can be gotten quite cheaply and still sound very good. Try them.
Sylvania 6sn7gt vt231 bad boys
I'll throw this in too because this is a very sought after tube. Suppose to be very good sounding and rank after the 6sn7w. These could have 2 or 3 holes black plates.
There you go. I'll try and talk about the other brands 6sn7 another day.
Ps... gtb takes the shortest time to warm up. So this is a plus.