Details
New old stock 9 pin miniature twin triode. Various brands. The 6681 is a selected 12AX7 for mobile service (steady operation at 12.6V +/- 1.3V on the filament).
NSN/FSN = 5960008782512
New old stock 9 pin miniature twin triode. Various brands. The 6681 is a selected 12AX7 for mobile service (steady operation at 12.6V +/- 1.3V on the filament).
NSN/FSN = 5960008782512