Chinese 12AX7 A, B & C?

[Doubleneck]

I would like to try some Chinese 12AX7's but don't know which to order?

Does anyone know what the difference is between the Chinese 12AX7 A, B & C?

Thanks

 

[AdamB]

I would also like to know this!

 

[EWSEthan]

I dont actually know, but Ive always used Bs since thats what Bogner uses and they sound bad ass!

 

[aeroic]

Neither do I, but I've been using Chinese 12ax7a with incredible results. Got them from thetubestore.com

 

[EWSEthan]

It might be amount of gain on tap. I had some As originally but the Bs definitely produce more preamp gain. Maybe the Cs sound like driving a Ferrari straight into a nuclear reactor.

 

[RockStarNick]

OK, Reinhold...

It probably is level of gain.

I'm curious as to the accuracy of these gradings. Like, I paid $2 extra for a "high gain" 12AX7A, and didn't like it, cuz it was dark. It was rated at 105. But I DO like all the 12AX7As that I've heard that are around 90-95.

I'm sure whether you get A, or B... they're probably relatively similar. There sure as heck aren't separate factories over there in Shuguang making different batches of tubes.

 

[Doubleneck]

Wasn't sure if they had different gains levels or if one is brighter than the other. I've always used thetubestore.com as well.
Thanks for the input.