2 6V6's, different sizes??

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Nolatone Ampworks, Oct 12, 2008.

  1. Nolatone Ampworks

    Nolatone Ampworks Silver Supporting Member

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    Hey folks,

    I just unpacked a matched set of JJ6V6S's and one is taller than the other.

    I've never noticed 6V6's differing in size.

    Anyone else seen this before, and is it a problem?
     
  2. SatelliteAmps

    SatelliteAmps Member

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    Never seen it in a new production tube. Any pictures?
     
  3. slider313

    slider313 Silver Supporting Member

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    Is the base larger? I've seen NOS stuff with the same bottle and plate structure with larger bases.
     
  4. slider313

    slider313 Silver Supporting Member

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    I know older JJ 6L6GC's, with the brown base, have a different bottle than the newer black base ones. The glass is thicker and the bottle is a bit shorter and wider on the brown base ones. As long as they're electronically matched there's no problem.[​IMG]
     
  5. Nolatone Ampworks

    Nolatone Ampworks Silver Supporting Member

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    Here are pics of what I describe.

    They came in the same order as a matched pair and the bases are the same:

    [​IMG]

    And this is a gratuitous gut shot of this 22 Tango build, though I've not finished cinching up the wires yet. It has nothing to do with the tube question, but I couldn't resist :)

    [​IMG]
     
  6. slider313

    slider313 Silver Supporting Member

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    One thing I noticed is the newer(black base)6L6GC has a "dimple" on the top and the older one does not. Maybe they re-tooled recently?
     
  7. Trout

    Trout Member

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    JJ is notorious you different height tubes as well as tubes leaning severely in the bases. Especially the 6V6's and 6L6's.

    I have several sets of " Matched " examples.

    They also vary internally a good bit, if they did not sound so darn good (IMO) I would stop buying them.

    This has been going on for a couple years, but the last 4 quads I bought last week were all over the place in height.
     
  8. Nolatone Ampworks

    Nolatone Ampworks Silver Supporting Member

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    You know, I'm also finding that I have several microphonic and crackly ECC83's in the last batch I bought. I may have to go to different preamp tubes.
     
  9. SatelliteAmps

    SatelliteAmps Member

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    Nice build. If the tubes sound good, and bias up fine, then the bottle size shouldn't make a difference.
     
  10. Nolatone Ampworks

    Nolatone Ampworks Silver Supporting Member

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    Except this one is going to a dealer, and people can be weird about things like that.
     
  11. Trout

    Trout Member

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    Yep, same here, It seems like their borderline at best QC has gotten worse lately.

    I have 4 or 5 ECC83's here doing the same thing. I have also gotten a couple 6V6's (month ago) with dead filaments.

    I guess that is always going to be a drawback when dealing with companies outside the USA, they(JJ) are well insulated from having to deal with rejects and any type of warranty.

    I feel bad for the vendors here though, They generally warrant products independently and these types of issues can really hurt especially when dealing in low margin items.
     

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