MATCHED QUAD VOSCHOD 6N23P (Equivalent E88CC / 6922 / 6DJ8).
NOS RARE DATE CODES 1976 YEAR. 

The parameters are measured at Uf = 6.3 V, Ua = 90 V, Bias voltage = -1.3 V


Tubes 6N23P in store:

PAIR 6N23P Reflektor Silver Shields 1975

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PAIR 6N23P Voskhod Grey Shield 1975

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PAIR 6N23P Reflektor Silver Shields 1974

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PAIR 6N23P Reflektor Grey Shield 1974

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PAIR 6N23P Voskhod Grey Shield 1974

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PAIR 6N23P Voskhod Grey Shield 1973

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PAIR 6N23P Voskhod Grey Shield 1972

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PAIR 6N23P Voskhod Grey Shield 1971

https://www.ebay.com/itm/387572827084