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  1. Dogmatrix

    For 6AS7G tube rollers here .....

    My best pair carry both brand names although they are 6520 , but it does illustrate the familiarity between the two names
  2. Dogmatrix

    Biggest head scratcher

    I enjoy your point of view and absolutely think it is valid here In the words of Julius Sumner Miller 1909 - 1987 "Why is it so" That is science
  3. Dogmatrix

    Biggest head scratcher

    In context I was commenting on the relationship between "When people say ....." and "....can be measured...." Not really interested in cables I build my own
  4. Dogmatrix

    Need help identifying my late grandfather's equipment

    Some tips for young players and apologies if I seem to be insulting your intelligence Everything has some value , even obviously expired tubes where the silver deposit on the glass has turned white indicating loss of vacuum can have value for art or display Any sealed boxes should remain so...
  5. Dogmatrix

    Need help identifying my late grandfather's equipment

    Could be very valuable or not so much depends on the type , so we would need a list of type codes to have some idea of value IE 5AR4 , 6AS7G , 5U4G etc these will be printed on the boxes and the valves Best to go by the code on the valve as the box may not be original
  6. Dogmatrix

    Post A Painting Thread

    Franz Marc 1912 Tiger
  7. Dogmatrix

    Do DACs matter?

    I think build quality and reliability are aspects not to be overlooked . In my early days I had a cheap dac thinking the dac had the least effect on the chain I upgraded the amp only to have the cheap dac fail and take the left channel of my new amp with it . Fortunately the amp builders...
  8. Dogmatrix

    For 6AS7G tube rollers here .....

    As always there is a high level of rebranding going on so it is always better to judge by internal structure Most of the black base GB tubes I see look very much like GE and the white version I see in equal numbers branded Philips and Sylvania
  9. Dogmatrix

    Eric McChanson Headphone Amp??

    Been going live lately Bowie , Hendrix , Norah Jones astounding realism and thanks to the HE500 zero background noise Quite a few Bowie concerts have been released recently in high res formats I suspect David considered the quality too low for release while he was running things Through my SS...
  10. Dogmatrix

    For 6AS7G tube rollers here .....

    Measurements give a strong clue Headphones are measurably different from one to the other Amplifiers not so much particularly within audible range Dac chips , I have seen no evidence of a measurable difference between dac chips in audible range So what I think is going on is , the differences...
  11. Dogmatrix

    RME ADI-2 DAC Thread

    Cord on my unit has fig 8 type connection like this one
  12. Dogmatrix

    THE best female vocals? (your favorite female singers)

    Speaking of not understanding a word I find this most beautiful
  13. Dogmatrix

    RME ADI-2 DAC Thread

    For .280v -9dBu
  14. Dogmatrix

    Eric McChanson Headphone Amp??

    No worries I think he uses the same transformers unless you specify an upgrade With his many years of experience in tube amp builds I suspect he probably has the B+ thing figured out I agree it is not unreasonable but I really think Eric sees every build/client of equal importance regardless of...
  15. Dogmatrix

    Eric McChanson Headphone Amp??

    Eric is a hobby builder so his designs are based on experience rather than lab testing and he is understandably sensitive about revealing the secrets he has spent many years discovering In my dealings it was clear Eric takes great pride in his work and he would not leave you with something you...
  16. Dogmatrix

    RME ADI-2 DAC Thread

    2v is +8.24dbu I would start with +7dbu ref level then adjust volume from 0 , you can go beyond +1 if you like and just back off if you start to hear distortion . This will give best s/n ratio
  17. Dogmatrix

    RME ADI-2 DAC Thread

    Remember the line out is a combination of volume level plus ref level Most home hifi gear will be happy with 2v line level so look for a combined figure of +8dbu on the RME @skhan007 -5 + -25 calculates to a very low .024v line level not ideal for good s/n ratio @simon740 +7 + -11 calculates to...
  18. Dogmatrix

    For 6AS7G tube rollers here .....

    A pair of plain old RCA 6as7g doing their thing in my new McChanson
  19. Dogmatrix

    For 6AS7G tube rollers here .....

    I have seen some GEC tubes develop small silver spots directly over the filament tubes but nothing as dramatic as that . I always thought it was something that had developed over years of use and took it as a sign of age . Carbon deposit is normal , quite common in 5998 types but again I thought...
  20. Dogmatrix

    For 6AS7G tube rollers here .....

    Yes , most of the brit tubes have two CV numbers depending on age
  21. Dogmatrix

    Eric McChanson Headphone Amp??

    This new Audio Technica hybrid is interesting AT-BHA100
  22. Dogmatrix

    Eric McChanson Headphone Amp??

    Good to know I can run speakers out of the headphone jack too , I hadn't thought of that for some reason
  23. Dogmatrix

    Eric McChanson Headphone Amp??

    Iron Man has fire in his eyes Running speakers via adapter out of the headphone jack in Eric's lounge for observation
  24. Dogmatrix

    Eric McChanson Headphone Amp??

    More Iron Man Coming in fast This pic features the stealth jack and the 421a switch
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