I was cleaning out the attic at my parents house this past weekend adn found a taped up box marked tubes on it.
My dad passed away way back in 1986, he was an elictrical engineer so I figured sooner or later I'd find something cool.
Well I found a pair of slightly burned in orginal Tung Sol 5881 (matching pair)
a pair of ........gulp brand new Mullard 12Ax7s
and a pair of brand new Tungsram 12Ax7's
All of these are from the 1960's
The Mullards may even be from the 50's (they have the old "Badge" logo on them.
I don't know whether I should just throw them into my Mark IV or sell them
any NOS tube junkies here that know what these are worth?