ECC83 TUBE TELEFUNKEN GERMANY 12AX7 PREAMP tubes quad ribbed LONG PLATE 17MM <>

4 tubes telefunken germany ECC83 12AX7 

Tested strong TV7D/U : 46/46 ; 46/46 ; 45/46 ; 44/46 (reference good 32/32) 

All tubes with diamond <> between pins , 

O getter 

SMOOTH PLATE 

17MM LONG PLATE 

Vintage tubes made in germany original 

box 156