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  1. #1
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    Western Electric 300B Single Limited - Recent volume imbalance between amps

    Hi

    I was hoping someone could possibly provide me with some advice,

    I have a pair Western Electric 300B Single Limited monoblocs and recently the volume of one of the amplifiers has dropped considerably, to compensate I have turned up the volume to even out the balance.

    Is this normal or something I should be concerned about ?

    Any guidance welcomed

  2. #2
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Quote Originally Posted by Eggmeister View Post
    Hi

    I was hoping someone could possibly provide me with some advice,

    I have a pair Western Electric 300B Single Limited monoblocs and recently the volume of one of the amplifiers has dropped considerably, to compensate I have turned up the volume to even out the balance.

    Is this normal or something I should be concerned about ?

    Any guidance welcomed
    Nice amps. But this isnt normal. Go ahead and switch the 300b output tube from left to right amp and see if it changes. You might have a tube going.
    Brinkmann Bardo w/ EMT HSD-006 cart, MSB Reference DAC --> Linear Tube Audio MicroZOTL --> Ampzilla 2000, 2nd Edition --> Fyne Audio F1-12

  3. #3
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Great idea, thank you.

    I will swap around the driver tubes as well and see what happens. Its an easy way to isolate the issue.

  4. #4
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Before I swap the tubes around I thought it best to give the Australian Shindo distributor a call, he told me this was quite normal for this to happen and he suggested I adjust the volume of each of the monoblocs to even out the balance.

    To balance out the sound I have one amplifier set at 12 o'clock and the other to 9 o'clock. I mentioned this to him and he told me that was fine.

    Would it still be a good idea to swap around the tubes ?

  5. #5

    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Quote Originally Posted by Eggmeister View Post
    To balance out the sound I have one amplifier set at 12 o'clock and the other to 9 o'clock. I mentioned this to him and he told me that was fine.

    Seriously?--someones taking the P**s

    What some dealers get away with--sad to read

    Bruce

  6. #6
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Quote Originally Posted by Bruce View Post
    Seriously?--someones taking the P**s

    What some dealers get away with--sad to read

    Bruce
    That is not normal and KeithR's advice is sound.
    Let's look at it a different way. If you were to try and sell them and pointed out this imbalance, how do you think a prospective buyer would react?
    Swap the tubes, see if the problem follows. If it does then you have the answer. If it doesn't then have them properly serviced.
    Are they still under warranty?
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  7. #7
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Mybad, linked to the wrong quote.
    My System:
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  8. #8
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    An update,

    The issue is getting worse and I have decided to drop the amplifier off at my techs for him to check and tell me what the problem is.

    I am concerned that I may be potentially causing more damage by continually adjusting the volume to compensate for the mis-balance

  9. #9
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Good luck with the repair, fingers crossed.
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  10. #10

    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Quote Originally Posted by Eggmeister View Post
    An update,

    The issue is getting worse and I have decided to drop the amplifier off at my techs for him to check and tell me what the problem is.

    I am concerned that I may be potentially causing more damage by continually adjusting the volume to compensate for the mis-balance
    Did you ever swap out the tunes and see if the problem moved with the tubes?
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  11. #11
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Quote Originally Posted by mep View Post
    Did you ever swap out the tunes and see if the problem moved with the tubes?

    I was not confident enough to do that myself, I will let my tech do all the checks.

  12. #12

    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Quote Originally Posted by Eggmeister View Post
    I was not confident enough to do that myself, I will let my tech do all the checks.
    Who plugs your tubes in for you for now?
    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.

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  13. #13
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Quote Originally Posted by mep View Post
    Who plugs your tubes in for you for now?
    The amplifier came with the tubes already installed.

    Also, there is something clearly not right with the amplifier, I am just more comfortable with my tech too look at it at this point.

  14. #14
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Latest update,

    My tech finally got around to checking the amplifier.

    He gave the amplifier a clean bill of health but told me that one of the tubes was on its way out. He couldn't understand what the Australia Distributor was thinking when he suggested to balance the sound by adjusting the volume.

    I managed to locate a replacement tube on ebay (a Mullard Blackburn CV181 circa 1953) my tech will test it for me once it arrives.

  15. #15

    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    So it was just a bad tube as suspected.
    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.

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  16. #16
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Where’s Walter when we need him?


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  17. #17
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    Re: Western Electric 300B Single Limited - Recent volume imbalance between amps

    Quote Originally Posted by mep View Post
    So it was just a bad tube as suspected.

    It was a simple fix.

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Western Electric 300B Single Limited - Recent volume imbalance between amps

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