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  1. #1
    Forum Regular Gastone's Avatar
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    Smile New member...

    Hello all!
    I´m noob in this game, and I´m not very good with english, so have patient with me.
    I´m 54 years, from sweden, and I have resently got tricked into a major project.
    I´m (lots of I´m) DIY an 120W tube amp as my first tube amp ever, so my presens here is to be more or less permant.

  2. #2
    music whore Happy Camper's Avatar
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    Welcome Gastone.

    Nice project to get tricked into.
    d HC b

  3. #3
    Super Moderator Site Moderator JohnMichael's Avatar
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    Welcome to AudioReview! Gastone your English is fine. There is a fair amount of tube knowledge on this site. Hope we can be of help.
    JohnMichael
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  4. #4
    Forum Regular Gastone's Avatar
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    Thanx all. I have a Q ...
    In Sweden most PSU circuit is CRC, but over seas it is CLC ...
    What is the benefit with chokes, vs Resistors. I´m using full wave recetifer, no tube.
    Maby this is´n the right forum to post this queston in

  5. #5
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    hello Gastone
    Welcome to AudioReviewForums. I am Sam or Sammy from Australia.
    I used Swedish Supra Ply3.4S cables on my speakers, really great cables for the money

  6. #6
    Phila combat zone JoeE SP9's Avatar
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    Quote Originally Posted by Gastone
    Thanx all. I have a Q ...
    In Sweden most PSU circuit is CRC, but over seas it is CLC ...
    What is the benefit with chokes, vs Resistors. I´m using full wave recetifer, no tube.
    Maby this is´n the right forum to post this queston in
    Welcome to AR.
    Not sure what you're asking. However, when using full wave rectifiers with tube circuits you should always have a soft start on them to slow inrush current to the tubes. Tubes need a slow (relatively) start up. Diode bridges come on instantly and will shorten tube life.
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  7. #7
    Forum Regular Gastone's Avatar
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    Quote Originally Posted by TechnicsNewA
    hello Gastone
    Welcome to AudioReviewForums. I am Sam or Sammy from Australia.
    I used Swedish Supra Ply3.4S cables on my speakers, really great cables for the money
    Hi mate, well some belive so, my naibor is one of them, for my self I use a standard kable for outdoors electric lamps 1.5 mm2 x 2.
    I do have some interconect with supra cables

  8. #8
    Forum Regular Gastone's Avatar
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    Quote Originally Posted by JoeE SP9
    Welcome to AR.
    Not sure what you're asking. However, when using full wave rectifiers with tube circuits you should always have a soft start on them to slow inrush current to the tubes. Tubes need a slow (relatively) start up. Diode bridges come on instantly and will shorten tube life.
    Ahh, translation error... I do have en soft start in the primary side of the x-former (toroid).
    And I have an 30 sec delay after heaters starts, but thats not the question.

    What I ment was: in the filter section after recetifers is an cap then an choke then another cap, but most of the DIY:er here in Sweden use a "Cap - Resistor - Cap".

    Is there an advantage to use an choke, or is it just "how things are" ?

    My mentor (the person who tricked me into this) says "no, U don´t need a choke"...

  9. #9
    Forum Regular Gastone's Avatar
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    No one who kan straitens this out for me ?
    Last edited by Gastone; 12-01-2009 at 08:06 AM.
    Gastone

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  10. #10
    _ Luvin Da Blues's Avatar
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    anscheinend nicht
    Back in my day, we had nine planets.

  11. #11
    Forum Regular Gastone's Avatar
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    To bad!!!
    I really need to know...
    Gastone

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  12. #12
    Forum Regular Gastone's Avatar
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    Hmm, tubes are not in favor here... well..
    Gastone

    OA 14

  13. #13
    Forum Regular Gastone's Avatar
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    OK I got answers on the matter, sorry to admit, in another forums...
    Gastone

    OA 14

  14. #14
    Rob_a rob_a's Avatar
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    Quote Originally Posted by Gastone
    Hmm, tubes are not in favor here... well..
    Sorry about the poor responce, their are a few tube heads here, just not that many. I myself am just getting into tube, so I am the one asking and reading, not answering. what was your results on your question???
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  15. #15
    Forum Regular Gastone's Avatar
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    Quote Originally Posted by rob_a
    Sorry about the poor responce, their are a few tube heads here, just not that many. I myself am just getting into tube, so I am the one asking and reading, not answering. what was your results on your question???
    CLC jämfört med CRC:
    + Du förlorar inte lika mycket spänning
    + Lägre rippel
    - Drosseln måste passa tomgångsströmmen, så det kan bli mindre marginal för experimentering
    - Dyrt (CRC KAN iofs bli dyrare om man tvingas köpa en mycket dyrare nättrafo för att kompensera spänningsförlusten över motståndet, samt ev. extra RC-länk i nätdelen för att få ner ripplet till CLC-nivå).

    Translation:
    + You don´t lose so manny volts.
    + Low ripple.
    - The Choke must stand upp for the idle current, so less marginal for experimet.
    - EXPENSIVE (CRC could be expensive too, if you are forced to by a more expensive x-former for compensation for looses i resistor, plus extra RC-link in PSUn to hold the ripple on CLC level).
    Gastone

    OA 14

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