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The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


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    Amperex ECC83/12AX7 tubes.

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    Frank111


    Posts : 105
    Join date : 2015-02-23
    Location : Minneapolis/StPaul Area

    Amperex ECC83/12AX7 tubes. Empty Amperex ECC83/12AX7 tubes.

    Post by Frank111 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.
    wgallupe
    wgallupe


    Posts : 138
    Join date : 2014-05-18
    Age : 70
    Location : Central Mass.

    Amperex ECC83/12AX7 tubes. Empty Re: Amperex ECC83/12AX7 tubes.

    Post by wgallupe 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
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    Frank111


    Posts : 105
    Join date : 2015-02-23
    Location : Minneapolis/StPaul Area

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

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

    Frank.

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