(!!!) (Recommended Quad) 6HA5=6HM5=EC900 Amperex Holland "Globe Logo" NOS in white boxes 1971 (10.2/10.4/10.7/10.8ma)

1) 10.2ma Gm=13,600

1) 10.4ma Gm=13,500

1) 10.7ma Gm=13,700

1) 10.8ma Gm=14,200