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Thread: Lowering output level using resistors

  1. #11
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    Quote Originally Posted by bumpy View Post
    Sorry to crash in on this debate, but to lower the signal by say 15 dB what value resistor you you pick, and I would recommend the AN tantalums.
    I would use a 10 kOhm series resistor in line with the source and a 1.8 kOhm resistor in shunt with the amplifier.
    Barry

  2. #12
    Join Date: Sep 2013

    Location: North Island New Zealand

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    I'm Chris.

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    Quote Originally Posted by Barry View Post
    I would use a 10 kOhm series resistor in line with the source and a 1.8 kOhm resistor in shunt with the amplifier.
    Which on a schematic looks like the attached, to the left is your source, and to the right your power amp
    Attached Files Attached Files

  3. #13
    Join Date: Jan 2009

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    Yes. Thanks for the diagram Chris, it explains things a lot more more simply - "a picture is worth a thousand words"!
    Barry

  4. #14
    Join Date: May 2018

    Location: Woking

    Posts: 803
    I'm Chris.

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    Just to update this I replaced the Dale 100k resistor with 220k AN Tantalum's.

    Result, knocked off 7-9 db which dropped the noise floor very nicely. Definite improvement overall, although I concede there are better ways to lower gain but they are currently slightly beyond my abilities.

    Appreciate everyone's views.
    System 1: - Amp - Musical Paradise MP-701 mk2 - Neurochrome 686
    - Source: Audio Technica LP-5 - Custom 6V6 stage - Novafidelity X30 - Soekris 1421 (LPSU) - Custom TDA1541 C3G DAC -
    - Speakers: Martin Logan Prodigy's - Subs: - REL T3's -

    System 2 - Amp: Musical Paradise MP 303/Custom 300B SET - Custom 6SL7 Pre -
    - Source: Pioneer N-30K - SONCOZ SGD1 -
    - Speakers: Loth X BS1's - Sub: REL T3 -

  5. #15
    Join Date: May 2018

    Location: Woking

    Posts: 803
    I'm Chris.

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    Quote Originally Posted by Pharos View Post
    This feels a bit like being asked to explain to a man in a different continent, how he should get to a given street when one has no knowledge of the town, or even the country.
    Does it?

    As I don't have the schematics (as stated) do you have any productive suggestions?
    System 1: - Amp - Musical Paradise MP-701 mk2 - Neurochrome 686
    - Source: Audio Technica LP-5 - Custom 6V6 stage - Novafidelity X30 - Soekris 1421 (LPSU) - Custom TDA1541 C3G DAC -
    - Speakers: Martin Logan Prodigy's - Subs: - REL T3's -

    System 2 - Amp: Musical Paradise MP 303/Custom 300B SET - Custom 6SL7 Pre -
    - Source: Pioneer N-30K - SONCOZ SGD1 -
    - Speakers: Loth X BS1's - Sub: REL T3 -

  6. #16
    Join Date: Feb 2010

    Location: Maidenhead, Berks

    Posts: 288
    I'm Lee.

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    Quote Originally Posted by Barry View Post
    I would use a 10 kOhm series resistor in line with the source and a 1.8 kOhm resistor in shunt with the amplifier.
    How do you calculate these values? I have found a T Attenuator calculator here https://www.leleivre.com/rf_tpad.html
    Cheers Lee

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