1. jspax7

    jspax7 Member

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    I have a Philips 7025A/12AX7A.

    Other lettering/numbers:

    L3E

    163
    B3G2

    GT-BRITAIN

    Construction is similar to other Mullard's that I have.

    Thanks.
     
  2. Groovey Records

    Groovey Records Member

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    try the Tubemomger photo library http://www.tubemonger.com/

    I have a Mullard with similar codes that was made in a Phillips plant in Belgum

    EnJoY ThE MuSiC
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  3. jspax7

    jspax7 Member

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    Thanks.

    I think the code may be B3G2.

    I thought Mullard's would be ecc83, rather than 7025A/12AX7A.

    The "B" is for Blackburn, I think.(?)

    They sound different than my IEC Mullards. (Fuller, darker/warmer, less compressed...) Maybe a bit louder too.

    Anyone else?
     
  4. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    I63 is the designation for the short-plate 12AX7A (ECC83), and the B-code is for Mullard's Blackburn facility. That thars a Mullard!

    - Thom
     
  5. rockon1

    rockon1 Member

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    Thunder gone -I'll add thats a mullard short plate. Nice tube for smoothing out and warming up an amp -especially the OD channel IMO. Bob
     
  6. jspax7

    jspax7 Member

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    Thanks guys! I suspected as much.

    I did notice a difference tonally between this and other short plate Mullard's that I have.

    The Philips 7025 is a little darker/fuller, and clearer with less compression.

    Have you guys noticed differences in the 7025's vs the ecc83's?
     
  7. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    The only way to have a meaningful discussion, when comparing two Mullard 12AX7s, is to state the version (I61 or I63) and date of production. That information comes from the etched codes. For instance, the I63 tube you mentioned was made in 1963. Perhaps your "7025" is an I61 version, made earlier (probably between '59 and '62)?

    - Thom
     
  8. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    You must be referring to the "L" code, for the Brussels Philips plant. To be precise, they're not Mullard, if they're made in Belgium. I've got some '50s Brussels Philips EL34 - they did fine work there.

    Hey jspax - can we see a photo of this 12AX7? Maybe they were made in Belgium, and not Blackburn (Mullard).

    - T
     
  9. Groovey Records

    Groovey Records Member

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    Here is my Belgium branded IEC Mullard EF86
    closer inspection shows L6DL etched in the glass
    next to Made in Holland

    [​IMG]

    [​IMG]

    [​IMG]

    If I recall from my reading after Mullard and Phillips merged two state of the art plants, almost identical to Blackburn in their tooling, were built in Belgium. One in Brussels and the other in Liege, hence the "L".

    This tubes box by the way said Melville, NY.

    Go Figure
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  10. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    My resources say that the "L" code is for the M.B.L.E. facility in Brussels, not Liege.

    - T
     
  11. jspax7

    jspax7 Member

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    I'll try to get a picture up tomorrow, but the lettering is clear.

    Top: 7025A/12AX7A

    Middle: PHILIPS L3E

    Bottom: GT-BRITAIN

    Etched codes are upside down on the bottom of the tube: 163 B3G2

    I wouldn't expect it to say GT-BRITAIN if it were made elsewhere, but if I can get a good photo, I'll post it.

    Thanks for all the great tube info.
     
  12. rockon1

    rockon1 Member

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    Aside from the actual internal structure -etch codes are the next most accurate way to I D a tube. For instance many USSR tubes were mislabeled in an order to hide thier origin during the 80's cold war senerio so I dont believe the painted writing as readily. Plus it can be faked much easier. That said in your case Gt Britain is accurate as the etch code matches. Thom was refering to something else I believe. Bob
     
  13. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    Just curious what that "L3E" looks like - is it an etched code?

    - T
     
  14. Groovey Records

    Groovey Records Member

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  15. jspax7

    jspax7 Member

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    No, it's not etched. It's around the middle of the tube, where the Philips brand is. Not quite as large as the brand, but bold capital letters.

    Any idea what that means?

    Seeing GT-BRITAIN and the etched "B" code is consistent with Mullard. Construction is similar to others that I have, both being 163 versions. One difference is the IEC tube has copper rods in the plates, and the Philips has silver colored rods. Both tubes have the seam on top, and as mentioned appear to be very similar in appearance.

    Still trying to get some high res. pics to post.

    Thanks for the help.
     
  16. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    I don't know what that means. But from your description (the L being painted, not etched) the tube most certainly is a Blackburn Mullard. I'm sure it is later production than the ones you've got with copper.

    - Thom
     

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