Hey, If it works good, sounds great, you're good!I'm currently using an ancient mullard 12at7. Is there any danger in keeping this tube in there? It's original in my 1964 super reverb, sounds great.
Old Tubes are cool
NEVER! It is not safe! You should take all of your old tubes out & send them to me!
...so I can add them to the old tubes that I use in my amps!:AOK
Old Tubes are cool,
I am curently breadboarding/building a .75-1W SE guitar amp using a fine specimen from my collection of tubes from the 20's