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Little Dot MKIII Tube Rolling

Discussion in 'Headphone Amps (full-size)' started by rogerb, Dec 18, 2007.
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  1. Acapella11
    Quote:

    Usually, you have switches for the gain and jumpers for the adjustment to EF95/EF92/EF91 family driver tubes. The version number is written on the board, check the holes in the bottom.
     
    If you have version 1, your power tube options are 6N6P, 6N6P-I and 6N6P-IR.
     
  2. MIKELAP
    287558777_o.jpg
     
    Quote:
    Just look under your mk3 in one of the peep holes upper right if you look soundways you should see it stamped on the edge of the board 1.0 or 2.0
     
  3. richdytch
    Hi - I have a tube question if anyone's up for it. About a year ago I bought from ebay what were advertised as "Match Codes PAIR JAN JHS Sylvania 6AK5W Tube NOS D Getter". 
     
    When they turned up, they looked like this: 
     
     
    GEorSylvania.jpg
     
    Very obviously GE branded, although labelled JHS on the boxes.I thought there had been some mix up, but couldn't be bothered to question it with the seller. I thought no more about it, until recently I tried them out again, and they have fast become my favourite tube when using my dt880s. The have the nice accurate soundstage I like with EF95 tubes, but they also have great bass and add just the right amount of warmth to the dt880. 
     
    I'd like to buy some more, since I like them so much - but I'm confused - can anyone provide a positive ID? Are they GE or actually Sylvania? Are the two brands the same thing?
     
    Cheers, Rich. 
     
  4. ChadHahn
    Thanks for the tip.  It turns out I have a version 2.0. 
     
    Chad
     
  5. ChadHahn
    Quote:
     
    I have switches for both the gain and the tube adjustment.
     
    Chad
     
  6. mordy
    Hi richdytch,
     
    Crossbranding is very common with vacuum tubes. JHS definitively is Sylvania. Try to look very carefully on the print on the tubes and see if you can find three digit numbers:
    188 means GE
    312 means Sylvania
     
    (I once bought a lot of 8 Mullard M8100/CV4010. One tube was stamped M8100 over the silk screening of a 5654/6AK5W made in USA Sylvania tube!)
     
  7. richdytch
    Thanks very much Mordy! Very very helpful.

    Rich
     
  8. mojorisin35
    T2eC16hsE9swmcM7dBQpRgBkI1Q60_3.jpg

    I just rolled my factory matched pair of Tesla 6f32 into my LD MKIII and my initial impressions are WOW!
    Without even being completely being burnt in they are something special.

    C360_2013-02-1808-19-38.Share.jpg

    The most outstanding quality thus far is the Crystal clear sparkling highs, which present themselves with great extension without any hints of sibilance.
    with these I find the Highs much more pleasant than the Tung sol 6AJ5 and the the highs of the Tesla's are way more resolved than the Voshkod 6ZH1P-EV.

    C360_2013-02-1808-24-12.Share.jpg

    I find the mids are very neutral they remind me of the Tung Sol 6aj5 mids perhaps a little less warm.
    However they are nowhere near the luscious mids of the mullard ef92’s so if you find the mullards to colored you might want to look into a pair of these.

    The Bass is deep accurate and clear and very close to the Bass of the Voshkod 6ZH1P-EV perhaps a touch more authoritative...

    The soundstage is as wide and deep as any I have heard however it has the added dimensionality of height. I had not been able to discern this before with other tubes but with these tubes there it was.
    Highly recommended! I cannot wait to see what they develop into after some burn in.

    C360_2013-02-1808-20-11.Share.jpg

    i will update as the tubes age

    Gary
    current tubes i own
    Sylavania JAN5654
    Tung Sol 6AJ5
    Voshkod 6ZH1P-EV
    Mullard EF92

    Power
    6n6p gold grid

    on the way
    Mullard M8083
    Mullard M8161
    Mullard M8100
    CBS / HYTRON 6AK5W
     
  9. MonolithNZ
    Hey guys. I've been wanting to tube roll my MKIII for quite a while so today I took the jump and bought a matched pair of "Tung-Sol JTL-6AJ5/6ak5/6J1/EF95" tubes from ebay. I've had a look at my circuit board and it appears to be a Version 4. Are these tubes suitable for that version? I'm not sure where my manual got to. Where I can find out how to set the jumpers for these tubes? (I'm new to this [​IMG])
     
    Thanks!!!!

     

     
  10. MIKELAP
    Quote:
     
    900x900px-LL-ff728275_287558777_o.jpg
    personnally i have a version 2.0(written v 2.0) check where i drew a circle for your model number its probably2.0 then those tubes are fine i have a pair of 6aj5 sound good
     
  11. MIKELAP
    Quote:
     
    900x900px-LL-990d525b_007.jpg   900x900px-LL-04848d73_001.jpg
     
    your 6aj5 are part of the ef95 family so put jumper on ef95 5654 side which is the right side of picture . the 2 pins starting from right side put jumper on those 2 pins
     
  12. MIKELAP
    Here is the link to the littledot mk3 manual                            http://dl.dropbox.com/u/6037680/Little%20Dot%20MK%20III%20Reference%20Guide.pdf
     
  13. mojorisin35
    Just a FYI there is a definite difference in sound from the 6aj5 and the 6ak5
     
  14. MonolithNZ
    Thanks heaps for the help MIKELAP! That's going to be very useful information when I roll my tubes. Cheers for the heads up mojorisin35. I guess I should do some more research. [​IMG]
     
  15. mojorisin35
    No worries, not bad just different. I have a pair of tung sol 6aj5 and a pair of 6ak5 booth good tubes but a different sound signature for each which suprised me.. I have some extra tubes of all makes as I went a little crazy so pm me if there are others you want to try or trade.
    Gary
     
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