(!!) (Best Value Pair) ECC84=6CW7 Ultron East Germany by RFT 1970's 1-3% matched (9.0/9.6ma and 9.0/9.3ma)
(!) (Best Value Pair) ECC84=6CW7 Ultron East Germany by RFT 1970's 2-3% matched (9.6/11.6ma and 9.0/11.0ma)
(!) 12AT7 East Germany branded "M" Mühlhausen NOS 1970's (8.4/9.0ma)
12AT7 East Germany branded "M" Mühlhausen NOS 1970's (7.2/7.6ma)
12AT7 East Germany branded "M" Mühlhausen used/tests like new stain on glass 1970's (9.4/9.6ma) (high Ma and Gm)
6U8A=6678 Dumont NOS 1971 (18.5/10.2ma)
6U8A=6678 Dumont NOS 1971 (19.7/7ma)
PCC85=9AQ8 Funkwerk RFT Germany NOS 1958 in white box (12.6/12.4ma)
PCC85=9AQ8 Funkwerk RFT Germany NOS 1958 in white box (13.5/16.0ma)