Philips mini watt Holland ECC81/12AT7 1955 Grey Rib Halo Getter (B1
Philips mini watt Holland ECC81/12AT7 codes VF1≠5I (1955) tests strong Grey rib plate halo getter clean blue pins. Tested BK 600 a1 91 a2 94 Typically a new valve tests 89 up strong balanced tube No shorts,gas or grid emissions