Quote:
Originally Posted by theducks
Hmm!
The data on Hollow State Devices is pretty stable. 
a #80 hasn't changed much (Along with the newer 5U4, 5W4 )  |
Right you are there.
I'm a tad different here. I like collecting stuff like this. Sometimes, when just digging up some history on these items, checking older versions of the books can give me an idea as to when a specific tube may have been introduced.
