6SL7 GT VT-229 Vorverstärker röhre RCA BLACK PLATE TUBE MIL SPECS ECC35 5691 X4 PCS
4 TUBES = 4 röhren RCA MILITARY MIL SPECS
TESTED STRONG TV7 = 78/72 ; 72/74 ; 68/66 ; 60/63 (REFERENCE GOOD AT 32/32) ,
BLACK PLATE
FAT PLATE
BADBOY
BLACK BASE
LARGE D GETTER WELDED BOTTOM
OLD PRODUCTION WW2 WWII