12ax7 Philips ecc83 mullard tube valve 15mm 6057 cv492

Matched Quad Quartet ( = 4 piece = 4 Pcs = 4 valves = 4 vintage vaccum tubes )
Same code I65 Delta O Halo getter 15mm Long Plate ribbed plate

B339 = 95-127-01 = 6L13 = CM1 = ECC83S = 0AX7 = 12AX7A = CV492 = E2164 = 7025 = CV4004 = E83CC = M8137

Twin triode preamp pre phono input stage driver
Socket Noval, B9A Filament heater Vf 12.6 Volt / If 0.15 Ampere / Indirect / Parallel / series ~ = AC/DC

4 valves strong tested TV7
test results on label for each tube.

code I65 old production 15mm

Long plate ribbed plate anode dark grey plate

tube valve lampe röhre tsf 진공관 真空管 HAM RADIO audio hi-end hi-fi diy POWER AMPLIFIER roehre Pre-Amplifier Preamp Pri VINTAGE stereo SE Single Ended PP Push-Pull VACUUM TUBES röhren box 52 codice 11