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Question about BC21 6sn7 tubes

I was wondering if someone out there could direct me to a reference that would explain to me the differences between the various 6sn7 tubes. I just bought a BC21 and am new to tubes. Is a 6sn7 the same as a 6sn7w, 6sn7gta, 6sn7gtb, vt-231?

I did a search in the forums and found some bc21 owner's favorite 6sn7 tubes from which I can kind of deduce substitutions but thought maybe there was a more definitive list somewhere.

Many thanks in advance.
tooter
gunbei
2,327 posts
 
Actually, when it comes to this preamp Sugarbrie is the man to ask here on the 'Gon!
tooter OP
85 posts
 
Thanks to all for your suggestions.

I guess what I was really trying to ask is that since the various 6sn7 tube types are different electrically can they be interchanged freely in a BC21. Based on the above posts from BC21 owners it seems so.

I am loving my BC21 and looking forward to diving into tube rolling. Right now my BC21 has the stock philips tubes and sounds very good to my novice ears. Even though this pre has its "faults" like any other piece of audio component I'm able to hear past them and still enjoy the music, something I've noticed about Blue Circle equipment in general.

Thanks again.
sugarbrie
3,854 posts
 
The stock Philips tube are actually pretty good. I think Rogue use to include them with the "upgraded" version of the Ninety-Nine preamp....

The BC21 is a very simple design, so you are listening to the tube itself in many respects. That makes it a fun unit to roll tubes with.
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