Tube Experts - Are these Amperex?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by justonwo, Feb 10, 2008.

  1. justonwo

    justonwo Member

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    I was told by the seller that these are "Philips House aka Amperex Mini" 12AX7 preamp tubes.

    They all look different to me, so I really have no idea.

    Notable Features:

    Tube A:
    • Etched in the glass below the lower mica: 162 (over)≠3B
    • There's a "9" formed in the glass surrounded by the pins
    • Looks like "374" was printed on the top of the tube
    Tube B:
    • There are no marks of any kind anywhere on the tube
    Tube C:
    • "Bel" insignia on front, labeled ECC83, "Made in India"
    • Looks like E27 (over) 81 is printed on the side below the lower mica
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  2. rockon1

    rockon1 Member

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    Tube A is a Seimens made in Munich Germany and a Philips family of tube

    Tube B appears to be Philips of unknown origin. Try looking closer for etchings in bright light with a magnifying glass.

    Tube C appears to be what its labeled as- Made in India by Bharat Electronics, Ltd. (BEL), . -Never actually owned by Philips but used Philips tooling according to resident expert Jeff west. Bobens
     
  3. justonwo

    justonwo Member

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    One person I talked to suggested that tube C is a Matsushita.
     
  4. rockon1

    rockon1 Member

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    No I believe it is what it says it is-Bharat Electronics, Ltd. (BEL). Besides Matsishita's have an angled getter. Bob
     
  5. Timbre Wolf

    Timbre Wolf GoldMember Supporter Gold Supporting Member

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    Just want to add that "Amperex" labeled many different Philips tube company's goods as "Amperex" - so, even though the first one is a Siemens tube, it might have been painted with the Amperex logo at one time. I've got a couple "Amperex" that are Siemens.

    That is just a roundabout way of saying that the Amperex (or Bugle Boy) logo is not very meaningful - always go with the etched codes to i.d. your tubes. Take a good look at tube "B" under a magnifying glass, in bright light, and I'll bet you'll find a Philips code on it.

    - Thom
     
  6. Lonely Raven

    Lonely Raven Member

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    Nice shots with the Nikon D70 by the way. You could have pulled a little more detail by going with manual settings and slowing down the shutter time till the exposure showed the details how you wanted them.

    Pretty damn sharp though!
     
  7. Blue Strat

    Blue Strat Member

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    Right, Amperex was a "brand name" and didn't necessarilly indicate a particular factory, country of origin, etc.
     

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