(!!) (Recommended pair) E83F=6689 Philips SQ Holland NOS gold pins 1974 (9.4ma and 9.6ma)

1 pair) E83F=6689 Philips SQ Holland NOS gold pins 1974

1 tube) 9.4ma and Gm=8200

1 tube) 9.6ma and Gm=8900

NOS Ma = 9-10ma

NOS Gm = 8500-9000

(10,000+ hour low noise Pentode)

– Telefunken v76 preamp