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  1. #1
    Senior Member
    Join Date
    Jan 2018
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    saṃsāra
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    885

    rectifier tube noise - is this normal?

    there is a distinctly audible "hissing" type noise coming from the 5u4-gb rectifier tube on my new power amp. to be clear, the noise is coming from the tube itself, not the speakers. i thought this might go away after a few hours of break-in but after ~60 hours it is still there.

    is this normal?

    cannot imagine that it is; however, given this is my first experience with tube rectification i wanted to check with others here.

    fwiw: at this point i am just using the stock electro-harmonix 5u4-gb rectifier ...a $15 new production tube.

    thanks!!
    kanjiroba yak + roon rock > t+a dac8 dsd > air tight atc-5 + atm-300r almarro a318b > viking acoustics berlin r mk2
    core audio designs plyKraft 3L | hifi racks ltd podium t5-iii | alp-tone audio analog cables

  2. #2

    Re: rectifier tube noise - is this normal?

    I have never heard a tube rectifier hiss.
    Micro Seiki SX-8000 air bearing table, SME 312s arm, SME 3012R arn, Dynavector XV-1s cartridge, Lyra Etna SL cartridge, ARC Ref 3 phono stage, Otari MX-55 2 track R2R, Ampex 350 tape repros, Roon Nucleus Plus music server, PS Audio DSJ DAC, ARC Ref 6, ARC Ref 75 with KT-150s, JBL 4345 speakers, Viero Equilibro Level 3 speaker cables, and Definitive Technology Ref subs.

  3. #3
    Senior Member
    Join Date
    Aug 2017
    Location
    Iowa City, IA
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    293

    Re: rectifier tube noise - is this normal?

    Could be a nearby cap that is failing.
    Morgan

    SPEAKERS KEF Blade 2 w/IsoAcoustics Gaia II | SUBWOOFERS Four DIY Speaker Hardware 12" passive subs driven by Dayton SA1000 amp | AMPLIFICATION Pass Labs X350.8, Cary SLP-05 w/Ultimate Upgrade | DIGITAL Marantz SA-10, Sonore opticalModule and opticalRendu, NUC8i7BEH Roon Core | VINYL EAT C-Sharp, Hana SL, EAT E-Glo S w/LPS, Bob's Devices Sky 20 SUT | POWER AudioQuest Niagara 5000, two dedicated circuits | WIRES AudioQuest William Tell, Earth, Leopard, Tornado | RESONANCE/ISOLATION Nordost Sort Kones, various Herbie's Audio Lab

  4. #4
    Senior Member
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    saṃsāra
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    Re: rectifier tube noise - is this normal?

    thanks for the replies! i went ahead and ordered a new rectifier tube so as to definitively rule that out before escalating.
    kanjiroba yak + roon rock > t+a dac8 dsd > air tight atc-5 + atm-300r almarro a318b > viking acoustics berlin r mk2
    core audio designs plyKraft 3L | hifi racks ltd podium t5-iii | alp-tone audio analog cables

  5. #5
    Junior Member
    Join Date
    Jan 2021
    Location
    Netherlands
    Posts
    12

    Re: rectifier tube noise - is this normal?

    Additionally check if the tube socket contacts are still clamping enough since a tiny gap or partial contact could cause some arcing/sparking that hiss. Retention is possible depending on the socket....but....make sure all the voltages are gone!

  6. #6

    Re: rectifier tube noise - is this normal?

    You can verify if it is the tube hissing and not a nearby cap by using a small, long skinny screw driver. This sounds stupid but it works. Hold the handle end tightly to your ear canal and press the tip against the tube, instant redneck stethoscope. Also, after shipping, sometimes tubes have to be reinstalled to make proper contact as ArnoP indicated.

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rectifier tube noise - is this normal?

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