Very early Amperex 12AU7 with welded plates. Tests 1164/1104 in a Maxi-preamp 2 where typical NOS is 1400-1600 and min is about 950 at 200 volts. Gain is like NOS at 16.8/17.2. CBS print code is early 54′.
Very early Amperex 12AU7 with welded plates. Tests 1164/1104 in a Maxi-preamp 2 where typical NOS is 1400-1600 and min is about 950 at 200 volts. Gain is like NOS at 16.8/17.2. CBS print code is early 54′.
You are buying a set of four tubes.