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Thread: Justin & Jerry's Hifi Blog

  1. #2511
    Join Date: Jan 2008

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    Posts: 11,519
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    Quote Originally Posted by Firebottle View Post
    The one problem with the valve output stage is that the HT voltage is only 75V, it is regulated which is good but it really could do with being higher to get the best out of any valve. The actual voltage across the valve is only 62V which only exacerbates the problem.

    As it is only a buffer and is at a high signal level the regulation isn't necessary, so I removed it and simplified the filtering to achieve 90V across the valve.

    Strangely (?), all of the valve buffer type arrangements I have come across don't run the valves very hot. Usually they aren't even hot to the touch, merely warm.
    Is there a reason for that?

    Jolida DACs come to mind. A few others as well.
    .

  2. #2512
    Join Date: Jan 2013

    Location: Bristol

    Posts: 6,843
    I'm Justin.

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    Quote Originally Posted by struth View Post
    oh, nice pic. thanks Alan...
    As I said but yeah a pic speaks a thousand words.

    I'm going to be as nice as Jezzer so anyone who would like to try the Sylvania Gold Brand and Western Electric can do so if they ask nicely and have some credible forum rep - for free.

  3. #2513
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    WE - yes please
    .

  4. #2514
    Join Date: Jan 2013

    Location: Bristol

    Posts: 6,843
    I'm Justin.

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    Quote Originally Posted by jandl100 View Post
    WE - yes please
    But you don't have any credible forum rep.












    Soz - no unobvious emoticons on a mobile in Tapatalk

    No probs Jerry

  5. #2515
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    I just want to try to see if I want to buy one.
    Happy to pass on after a day to anyone else that meets Justin's approval.
    .

  6. #2516
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 99,005
    I'm Grant.

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    Dunno if there is another member of jerrys rep tbh
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    FIIO K7 BT, M11 PLUS, BTR7, KA5 - OPPO BDP-103D - PANASONIC UB450 - PANASONIC 4K ULTRA HD TV - PIXEL 6 - AVANTREE LR BLUETOOTH - 2* X600 SOUNDCORE - HEADPHONES INCLUDE, FIIO, NURAPHONES', FOCAL, OPPO, BOSE, CAMBRIDGE, BOWER & WILKINS, DEVIALET, MARSHALL, SONY, MITCHELL & JOHNSTON - 2*ZBOOK'S- MERCURY BD ROM, ROON, QOBUZ, TIDAL, PLEX, CYBERLINK, JRIVER - MULTI HDD'S -

    Oh my god! There's nothing wrong with the bidet is there?

    “Nothing discloses real character like the use of power. It is easy for the weak to be gentle. Most people can bear adversity. But if you wish to know what a man really is, give him power. This is the supreme test. It is the glory of Lincoln that, having almost absolute power, he never abused it, except on the side of mercy".

    “You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police ... yet in their hearts there is unspoken fear. They are afraid of words and thoughts: words spoken abroad, thoughts stirring at home -- all the more powerful because forbidden -- terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic.”

    "You don't have free will. You have the appearance of free will.”

    “There's a war out there, old friend. A world war. And it's not about who's got the most bullets. It's about who controls the information. What we see and hear, how we work, what we think... it's all about the information!”


    ***SMILE, BE HAPPY***

  7. #2517
    Join Date: Jan 2013

    Location: Bristol

    Posts: 6,843
    I'm Justin.

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    Quote Originally Posted by struth View Post
    Dunno if there is another member of jerrys rep tbh
    Nope.

    I'll drop you a Gold Brand too Jerry. No accounting for systems and tastes!

    So there's a Gold Brand still going for someone else to try.

    https://youtu.be/gqSzDJGFCgI

  8. #2518
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    OKey doke.

    And postie has just delivered a GE JAN 5670W.
    .

  9. #2519
    Join Date: May 2011

    Location: Glasgow

    Posts: 7,715
    I'm Brian.

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    Regards
    Brian

    Sell your cleverness and buy bewilderment . (Rumi )


    Korus Computer Audio music server
    JustBoom DAC . HRT Musicstreamer 2
    Amplifier : Sony TA FB740R
    Speakers : Tannoy 637
    Interconnects : MS Audio / Klotz MC5000 .
    Speaker cables : Western Electric 16AG

  10. #2520
    Join Date: Jan 2008

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    Too many valves, so little time.
    .

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