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    6Н2П Tubes

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    goddlediddles

    Posts : 19
    Join date : 2012-10-13
    Location : Kerry, Ireland

    6Н2П Tubes

    Post by goddlediddles on Fri Feb 15, 2013 8:25 am

    I recently bought 4 6Н2П tubes on eBay from Lithuania. They were made in Russia during Soviet times and were 1984 NOS stock costing about $2 each. They are a direct equivalent to the 12AX7 but have 6.3 volt filaments on pins 4 and 5 so not directly replaceable without rewiring the supply. I couldn't wait to try them out in my PH6 and although their gain and general performance was up to spec they suffer terribly from microphony, so bad that even turning the volume pot could be heard as a squeaking sound on the speakers. No good whatsoever in a high gain circuit but probably fine in a line-level amp.

    goddlediddles

    Posts : 19
    Join date : 2012-10-13
    Location : Kerry, Ireland

    Re: 6Н2П Tubes

    Post by goddlediddles on Fri Feb 15, 2013 11:09 am

    Here is a physical comparison.

    Left to right: JJ, Electroharmonix and the Russian 6Н2П.
    The JJ and the 6Н2П have similar plate heights which are shorter than the Electroharmonix but the JJ has the mica plate end pieces touching the glass.



    hawaii.ken

    Posts : 157
    Join date : 2012-01-31

    Re: 6Н2П Tubes

    Post by hawaii.ken on Fri Feb 15, 2013 6:40 pm

    Thanks for the info!


    Last edited by hawaii.ken on Fri Feb 15, 2013 6:41 pm; edited 1 time in total

    buchela

    Posts : 30
    Join date : 2011-03-09

    Re: 6Н2П Tubes

    Post by buchela on Sat Feb 16, 2013 12:45 pm

    @ goddlediddles
    These are recommended to be used with small input signals. ( Very high amplification factor: 100 ). try the Russian 6N2P-EV variant. I use them in a modified DAC and the plain 6N2P is not as clean sounding as 6N2P-EV according to my ears. (I have only tried the Russian made ones ). Just be aware some sellers are shipping used tubes, or mixing used with unused ones. I learned the hard way.
    As a side note, to vent my frustration I step on them to crushed them but they wouldn't, I took a hammer and after the first few blows still they would not brake, it took me a while to brake them.
    OH COME ON !!!!!!!!!!! I love recycling !!!!!

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