The Mullard 9r1 code.
M8100 CV4010 5654 EF95 MULLARD VINTAGE PAIR VALVE TUBE - SQUARE GETTER BLACK ...
Vintage Mullard EF95 M8100 5654 Black Plate Square Getter Valves Matched Pair
Mullard EF86 Vacuum Tube Vintage Audio Component British Made
12AX7 GE SQUARE GETTER LONG PLATE NOS VALVE TUBE (LC44)
Matched Pair GE USA JAN 5654W 6AK5 EF95 Green Print Square Getter Valves
5814A RAYTHEON TRIPLE MICA SQUARE GETTER NOS VALVE TUBE
