77 FIVRE ITALY ~ 6J7G TUBE MESH SHIELD PUNCHED VALVE PREAMP
this is the oldest version of ( previous model of ) KTZ63 348A Z63 6J7 cv1935 ef36 ef37 cv1074
nos tubes from bulk of Italian Broadcast Studio " RAI " of Milan as per engraved base brown base & yellow label long, pan getter , copper wirings
mesh punched silver shield rounded , long ST Coke Bottle shape , same stock, same old production codes 7/P R.A.
ultra rare vintage genuine vacuum tubes valves extra high quality oldest production Made in Italy
77 FIVRE TUBE MESH SHIELD MATCHED PAIR ( 2 PIECES = 2 PCS = 2 TUBES = 2 VALVES )
included 2x ceramic sockets vintage U6A, same as per pictures
VINTAGE VACUUM PENTODE DRIVER VACUUM TUBES VALVES MADE IN ITALY PREAMP FOR PHONO STAGE INPUT PRE AMPLIFIER LINE STAGE
very very rare !
6J7G = KTZ63 348A Z63 6J7 BLACK BASE & HANGING FILAMENT & MESH SHIELD
The only difference vs 6J7G is the base socket U6A vs standard Octal
TEST RESULTS: FULLY TESTED 64 / 62 WITH TUBE TESTER CALIBRATED TV7D/U MILITARY GRADE
( REFERENCE GOOD IS 31 )
GENUINE ORIGINAL FIVRE BLUE LABEL OLDEST PRODUCTION LATE 1940's
Brown engraved BASE & MESH rounded SHIELD
Socket 6-Pin-Base U6A, old, USA (Codex=Kf) Top contact with a cap
Heater Filament Vf 6.3 Volt / If 0.3 Ampere / Indirect / Parallel / series ~ = AC/DC
preamp pre amplifier phono input stage driver
features: tube valve lampe röhre tsf 진공관 真空管 HAM RADIO audio hi-end hi-fi diy POWER AMPLIFIER Pre-Amplifier Preamp Pri stereo SE Single Ended PP Push-Pull Brimar Vintage NOS Tubes Sockets Vintage NOS Tubes Sockets without Custom Bundle Test Tubes Vintage NOS Tubes Sockets without Modified Item Hickok Vacuum Tube TestersVintage NOS Tubes with Custom Bundle Vacuum Tube Guitar Amplifiers Sencore Vacuum Tube Testers B&K Vacuum Tube Testers Geiger Tube Indiana Test Equipment Radiation Detectors
box 77