Samsung | Hi-Fi.ru
3 4 1234
51 75 82
  1. #51

    20.10.2006
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  2. #52
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    02.07.2005
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  3. #53

    04.08.2005
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  4. #54
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  5. #55

    27.03.2006
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  6. #56

    20.10.2006
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  7. #57

    21.04.2006
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  8. #58

    02.01.2006
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  9. #59

    20.10.2006
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  10. #60

    21.04.2006
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  11. #61

    02.01.2006
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  12. #62

    20.10.2006
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  13. #63

    30.08.2012
    UK
    2

    Hello - in English I'm afraid. My Russian is not so good.

    I tried this out in SE in place of 300b

    operating conditions:

    6P21 is at 424v a-k, -42v, 39mA. Input is 4P1L in filament bias into a 126C interstage, about 13mA, Va 168v, -13.7v.

    OPT is LL1682/50mA. I don't know how good this is - I never got great results with it in the past. I always thought the LL1620/80mA was better, which is what
    I have in my 300b SET which has the identical input section.

    So sound. It regrettably doesn't have the tone of the 300b - doesn't have that lushness or atmosphere. So I'm missing the 300b, which will be put back.
    The OPT is a factor, but I don't believe it has that much influence. I'll see when I swap over to 300bs.

    Otherwise detail is excellent - as good as 300b if not slightly better. Bass is deep and good. The problem is it starts losing the tone in the midrange - it gets hard
    and one-dimensional - not "bad" but not quite comfortable either. It's a bit tiring. And treble is also rather hard.

    So, conclusion is it works and has plenty of detail, but the tone is some way behind the 300b. I don't see myself using it unless the problem is with the OPT, which I rather doubt.

    I really tried to like this tube, but I'm not getting the sound in a quick-and-dirty experiment.

    Andy

  14. #64

    30.07.2005
    256

    andyjevans
    I tried this out in SE in place of 300b

    operating conditions:
    Andy, what was the load resistance in your experiment? 6p21s has over 3 times higher inner resistance than 300b...
    ; 31.08.2012 00:45.
    ,

  15. #65

    30.08.2012
    UK
    2

    I think the Lundahl LL1620/80mA is wired up as 3.3K primary.

  16. #66

    30.07.2005
    256

    3,3K is too small, 6p21s requires 7-8K load resistance. "α"-ratio is a very important factor, don't underestimate it ! You'd rather try parallel connection of two 6p21s with this OPT.
    ; 02.09.2012 01:19.
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  17. #67

    20.06.2007
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  18. #68

    04.04.2010
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  19. #69

    20.06.2007
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  20. #70

    21.01.2006
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  21. #71

    20.06.2007
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  22. #72

    27.04.2011
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  23. #73

    30.07.2005
    256

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  24. #74

    08.05.2006
    886

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  25. #75

    19.06.2007
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