Deano: Most NOS tubes are discards. They were not up to the standards of the day. What do you think, someone stuck tons of these tubes in a vault and forecasted that one day these tubes would be worth a fortune?
Most manufacturers have no idea how to select tubes. There are a few that I know of that really know their sh*t. Vladmir Lamm, Ken Stevens, Michele at Tenor Audio, Victor Komhenko, EveAnna Manley are just a few.
My experience with the Telefunken 12AX7 is the opposite result. I found them microphonic and tubby. I had and probably still have a large supply. There are current production tubes that I prefer by a wide margin.
Most manufacturers have no idea how to select tubes. There are a few that I know of that really know their sh*t. Vladmir Lamm, Ken Stevens, Michele at Tenor Audio, Victor Komhenko, EveAnna Manley are just a few.
My experience with the Telefunken 12AX7 is the opposite result. I found them microphonic and tubby. I had and probably still have a large supply. There are current production tubes that I prefer by a wide margin.