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There is blackening on the glass of some of them, does that mean they're blown? I really don't know anything about valves.
That Brimar 12ax7 is one of the more desireable preamp valves for guitar amps so I’m sure someone here will snap it up.
Oo! Is it indeed?
This might be wrong, but I think it's because Brimar were created to replicate American valves.
I’m guessing this one is mid 50’s.
Other than the 320 on the front of the Brimar 12AX7, there is 3A6/573 on the rear.
If it was tested with a valve testing kit and found to be strong and balanced however, it’ll fetch a lot more, but just knowing it works would be a good start.
So how do I do that cost effectively?
I'm showing my naivety here but could I put the 12AX7 in my amp to see if it works or would I be risking my amp?
Edit: I was joking about the last part, it should be safe.