Type 1
electron tube 12AX7/ECC83
Type 3
vacuum tube12AX7/ECC83
Type 4
power tube 12AX7/ECC83
Type 5
magnetron 12AX7/ECC83
Type 6
Pulse magnetron 12AX7/ECC83
Type 7
Oscilloscope tube 12AX7/ECC83
Type 8
rectifier tube 12AX7/ECC83
condition
original and new 12AX7/ECC83