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    Amperex ECC83/12AX7 tubes.

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    Frank111

    Posts : 86
    Join date : 2015-02-23
    Location : Minneapolis/StPaul Area

    Amperex ECC83/12AX7 tubes.

    Post by Frank111 on Wed Jan 25, 2017 12:29 pm

    Trying to identify what these codes mean on some Amperex ECC83/12AX7 tubes that I have.
    They are 'Bugle Boy' type, made in Holland, and these are the codes:

    59 UU

    I 61 49G


    Thanks,
    Frank.
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    wgallupe

    Posts : 112
    Join date : 2014-05-18
    Age : 63
    Location : Central Mass.

    Re: Amperex ECC83/12AX7 tubes.

    Post by wgallupe on Wed Jan 25, 2017 2:12 pm

    I'll take a shot at the second sequence I61 49G. Not sure what the 1 is doing in that sequence.

    If it were I6 49G it would be:

    I6 = Amperex (also known as Philips) designation for 12AX7 (also known as ECC83)

    4 = Made in Heerlen, Holland ( the 4 is actually a right triangle symbol)

    9 = 1959 (year of manufacture)

    G = July (month of manufacture)

    Regards,
    Wayne

    Frank111

    Posts : 86
    Join date : 2015-02-23
    Location : Minneapolis/StPaul Area

    Re: Amperex ECC83/12AX7 tubes.

    Post by Frank111 on Wed Jan 25, 2017 2:16 pm

    Thank you! That's very helpful info for me!

    Frank.

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