Mystery 12ax7s!!! What could they be???

TommyShameless · Post by **TommyShameless** » Tue Nov 22, 2011 11:30 am

I have these...I don't know what they are, since they aren't labeled. Anyone care to take a guess?

They say 163, and B7L1.

What do we have here?

Tommy

stef · Post by **stef** » Tue Nov 22, 2011 11:42 am

I had 3 of those too, used and almost dead. No idea what they are. Sounded pretty good before they started to make cranking and popping sounds.

demonufo · Post by **demonufo** » Wed Nov 23, 2011 7:05 am

That's I63 and they're Blackburn Mullards.

TommyShameless · Post by **TommyShameless** » Wed Nov 23, 2011 8:36 am

So, wow! So these are pretty sweet, then!

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