I'm cutting and pasting the below from the eBay auction where I got these. My pre-amp already had a 1980's pair of these, I read the 1970's versions were better, but my ears could not tell the difference. So, selling the ebay pair and keeping what I have. Read the reviews, these are the ones to have (have the rocket ship logo on them). $40 shipped in the USA via USPS Priority.
6N23P / 6Н23П Soviet TUBES
!! MILITARY "Red star CCCP Winged Logo" VERSION !!
Made in USSR during the 70's by
/ VOSKHOD, KALUGA FACTORY /
Probably the best 6N23P tubes money can buy nowadays on the market!
< TESTED & MATCHED PAIR >
Ia1 Ia2 S1 S2
mA mA mA/V mA/V
6N23P Tube 1 15.0 15.0 13.0 13.0
6N23P Tube 2 15.0 14.5 13.0 13.0
