12AT7/ECC81
Miniature 9 pin dual triode
Series heater: 12.6v-.15 amp/Parallel heater: 6.3v-.3 amp
NOS
Philips ECG
Small gray plate
Matched sections
Jan type in commercial distribution dress? This tube looks like
the Philips ECG 12AT7WC. Not uncommon to put JAN over runs
into commercial boxes.
High MU triode
Philips ECG box