I went through my stash of 12ax7's and came up with some cool UOS 12ax7's that I am trying to identify. I will take a few pictures in next day or so and post them so maybe we can figure it out via getter and halo construction.
One tube I am curious about is one that is labeled National in red, but has made in Great Britain in white somewhat under the National label. Im asking because the only reference to National I have found is ones produced for National by Tung Sol in the 60's. The only tube manufacturer in GB I know of was Mullard. I know this tube is not a "fake" as I personally pulled it from my grandmothers Hammond Organ after she passed away. I also have some 12au7 Hammond relabels that were made in USA that work well in my buddies Bass 400+ in the driver position.
One tube I am curious about is one that is labeled National in red, but has made in Great Britain in white somewhat under the National label. Im asking because the only reference to National I have found is ones produced for National by Tung Sol in the 60's. The only tube manufacturer in GB I know of was Mullard. I know this tube is not a "fake" as I personally pulled it from my grandmothers Hammond Organ after she passed away. I also have some 12au7 Hammond relabels that were made in USA that work well in my buddies Bass 400+ in the driver position.