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Vali 2 tube rolling

Discussion in 'Headphone Amps (full-size)' started by capt369, Jan 8, 2016.
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  1. Paladin79
    The BH Crack has no pre-amp out per se, some folks just come out of the TRS jack into dual RCA connectors but I have added that circuit to a couple I built.
    bcowen likes this.
  2. Ripper2860
    Doh! Well, I'm sure I can find a source for that adapter when the time comes.
    bcowen likes this.
  3. Tjj226 Angel

    You do realize this entire thread is kind of stupid right? Swapping 7 different tubes is a complete waste of time and resources. Get a volt meter, figure out the operating conditions of the tube in the vali. Figure out the plate voltage, and the supply voltage. Then figure out how the tube is being biased and what the bias voltage is.

    Once you have these parameters, start looking at tube data sheets and figure out what tube is the most linear and well loaded at those parameters.

    For instance if the tube is biased at lowish current and low bias voltage, I would run away from the ECC88 and 6922 type tubes. The 6bq7a is a better tube at lower operating conditions.

    However if schiit biased the tube for a bit more current (something in the 15ma range), then the 6922 COULD be better because of its lower plate resistance.

    The other catch is to understand that as any of these tubes approach the 0v grid line, all of these tubes start to fall apart. A tube with a higher amplification factor could help you crank the volume up higher whilst staying away from the 0v gird line and keeping distortion at a minimum.

    Blindly swapping tubes around without understanding the circuit is just throwing good money after bad.
  4. Mr Trev
    You bought a tester? You should've held out for a tester box. From what I've gathered box rolling is the in thing now:grinning:
    bcowen and Ripper2860 like this.
  5. Paladin79
    Some of us happened to talk to Jason Stoddard before swapping tubes and he designed the amp. Thanks for your input though. :)
    Old Deaf Donkey and bcowen like this.
  6. Ripper2860
    Bill was joking. Sadly, I have approx.200 tubes and my refurbished and calibrated BK tester was a bargain. I tend to stick with tubes that closely align with the design of the amp in which they will be used. I'm no expert and rely on the tester to tell me if the tubes are strong and balanced.

    Btw- I'm not a hoarder - I'm a collector, dammit!
    ScubaMan2017, bcowen and Shane D like this.
  7. Tjj226 Angel
    Did he tell you guys what the operating conditions were or did he tell you what his opinions were?
  8. Paladin79

    He mentioned which tube types matched up. I am not sure where you got 7 types.

    The biggest concern was 6SN7’s as I recall.
    Last edited: Nov 29, 2019
    bcowen likes this.
  9. bcowen
    Then either you enjoy reading stupid stuff or you're just trolling.

    Ignore set.
  10. Old Deaf Donkey
    Come on. The fella has a scientific method of determining what other people should enjoy hearing. No wonder he has 34 likes for 500+ posts.
    Paladin79 and bcowen like this.
  11. Shane D
    Has anybody tried the https://www.thetubestore.com/rca-6cg7-6fq7?cur=CAD?

    I just read on the site that can't be named that it was a pretty good for Both the Lyr 3 and Vali 2.

    I got some new toys recently and haven't used this amp in weeks. I really do have to get back into it.

    Shane D
    bcowen likes this.
  12. Tjj226 Angel
    Meh. Think what yall want. But spending this kind of money on rolling tubes without knowing whats actually going on in your amplifier is nothing short of flying blind. I care if you buy a western electirc, brimar, or hytron tube. I just care about using the right type of tube for the job.
    Ripper2860 likes this.
  13. CAPT Deadpool
    bcowen likes this.
  14. Ripper2860
    Wish I could be there Capt D.

    Hmmmm. I have a hankering for Fish planks and Hush Puppies all of a sudden. :smile:
    bcowen and Paladin79 like this.
  15. Paladin79
    You care if we buy specific brands? I believe you mean you do not care. Good luck in your tube rolling or lack there of. :)
    bcowen likes this.
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