(!!!!) (Best 6201 Pair) 6201=E81CC=12AT7 Valvo Hamburg Germany gold pins rebranded Philips NOS 1972 1-3% matched (9.2/10ma and 9.4/9.6ma)
(!!!!) (Best Pair) E80CC=6085 Philips SQ Holland 1972 1-2% matched (5.6/6.2ma and 5.4/6.4ma)
(!!!!) (Recommended Pair) E80CC=6085 Philips SQ Holland 1972 1-2% matched (5.5/6.9ma and 5.5/6.7ma)
(!!) (Good Value Single) 6201=12AT7 Valvo Germany rebranded Philips SQ 1970 (6.8/7.8mA)
E80F=6084 Philips SQ Special Quality Holland Gold Pins NOS 1968 and 1973 (2.9ma/3.0ma) 1-3% matched
