(!!!!) (Matched Quad) 6L6G MULLARD UK NOS 1955-1959 (69.6, 70, 70.6, 70.8ma)
(!!!!) (Recommended Mullard Single) 6DJ8 RCA Mullard NOS "A" Frame getter halo 1976 (10.6/12.6ma)
(!!!!) (Recommended Pair) 12AX7=ECC83 Mullard England ribbed plates NOS 1966-1970 (163 Series) (1.1/1.0ma and 0.9/1.0ma)
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (10.2/11.2ma and 10.4/11.2ma) 1-2% matched
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (10.4/11.4ma and 10.6/11.8ma)
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.0/10.4ma and 9.4/10.0ma) 1-3% matched
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/8.8ma and 9.4/9.0ma) 1-2% matched
(!!!!) (Recommended Pair) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.8/11ma and 10/10.9ma) 1-2% matched
(!!!!) (Recommended Pair) EL84 Telefunken Germany <> bottom NOS 1963-1966 (68ma and 69.5ma) (recommended for FIXED-BIAS amp only due to high current)
(!!!!) (Recommended Single) 12AT7 RCA NOS 1965 (9.5/8.7ma)
(!!!!) (Recommended Single) 12AU7=ECC82 Mullard UK ribbed plates NOS 1963 (11.4/9.6ma) (smooth rich sound)
(!!!!) (Recommended Single) 12AU7=ECC82 Mullard UK ribbed plates NOS 1970 (10.4/8.6ma)(smooth rich sound)
(!!!!) (Recommended Single) 12AU7=ECC82 Mullard UK ribbed plates NOS 1972 (12.2/13.6ma) (same Gm) (smooth rich sound)
(!!!!) (Recommended Single) 6DJ8 Philips Miniwatt Holland NOS 1960 era large "O" getter halo (18.0/19.4ma)
(!!!!) (Recommended Single) CV181=ECC32 Mullard black base black plates used/tests like new 1950's (6.4/6.5ma)
(!!!!) (Recommended Single) CV181=ECC32 Mullard black base gray plates like new 1950's (5.2/5.3ma) (close Gm)
(!!!!) (Recommended Single) CV378=GZ37 Mullard UK NOS 1967 (52/40 and 54/40) 1-3% section balance
(!!!!) (Recommended Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.6/11.3mA)
(!!!!) (Recommended Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.4/11.3mA)
(!!!!) (Recommended Single) CV4004=12AX7 Mullard box plates NOS 1971-1972 (Gm=1500/1500) (1.0/1.1ma)