Parasound HCA 1000 about to blow

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kevhed72
kevhed72 Posts: 4,959
in The Clubhouse
I think....the left side runs pretty hot to the touch even when not driving speakers, and it recently started a pretty audible buzz. Anyone want to take a crack at fixing it?
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  • kevhed72
    kevhed72 Posts: 4,959
    edited May 2018
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    For a price of course. I would also be open to upgrades if that was in your wheelhouse....
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  • mlistens03
    mlistens03 Posts: 2,767
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    I don’t want to try, but it sounds like something serious, I’d pop off the hood just to make sure it’s not something easy like a blown cap or resistor
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  • kevhed72
    kevhed72 Posts: 4,959
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    Good idea....Ill take some pics. Are you skilled in the SS amplifier arts?
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  • pitdogg2
    pitdogg2 Posts: 24,575
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    It is a bias thing. You tube it
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  • txcoastal1
    txcoastal1 Posts: 13,132
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    pitdogg2 wrote: »
    It is a bias thing. You tube it

    Wouldn't the problem actually be un-biased :p
    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Unison Research Simply Italy Integrated
    Gone to new homes: (Matt Polk's)Threshold Stasis SA12e monoblocks, Pass XA30.5 amp, Usher MD2 speakers, Dynaudio C4 platinum speakers, Modwright LS100 (voltz), Simaudio 780D DAC

    erat interfectorem cesar et **** dictatorem dicere a
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  • pitdogg2
    pitdogg2 Posts: 24,575
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    txcoastal1 wrote: »
    pitdogg2 wrote: »
    It is a bias thing. You tube it

    Wouldn't the problem actually be un-biased :p
    Smarty pants
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  • txcoastal1
    txcoastal1 Posts: 13,132
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    pitdogg2 wrote: »
    txcoastal1 wrote: »
    pitdogg2 wrote: »
    It is a bias thing. You tube it

    Wouldn't the problem actually be un-biased :p
    Smarty pants

    Just trying to give a bias perspective on the situation
    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Unison Research Simply Italy Integrated
    Gone to new homes: (Matt Polk's)Threshold Stasis SA12e monoblocks, Pass XA30.5 amp, Usher MD2 speakers, Dynaudio C4 platinum speakers, Modwright LS100 (voltz), Simaudio 780D DAC

    erat interfectorem cesar et **** dictatorem dicere a
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  • Manticore
    Manticore Posts: 408
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    Had a similar problem with my para 1500A minus the buzz. An adjustment of the bias pot with a screwdriver & a digital meter solved the heat problem. The bias was considerably off spec. Really was not difficult at all.
    Denon AVR X4200W
    Parasound A23 amplifier
    Parasound A23 amplifier
    LG 65" Ultra HD4k
    LG 4kBR - UP970
    Denon DVM 4800
    Denon DP 3000 turntable
    Saec 308sx tonearm w/
    Dynavector 10x5 cart
    Vincent PHO 701 Phono Preamp
    MIT Avt3 Speaker c's
    Audio Quest Big Sur ic's
    Polk SDA 1C's modded
    Polk LSim 707
    Polk LSiM706c
    Polk RTiA 3's
    Polk 80F/X-RT
    Polk DSW PRO 440wi sub
    Infinity bu2 sub
    "The early Klingon gets the Gagh"
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  • mlistens03
    mlistens03 Posts: 2,767
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    kevhed72 wrote: »
    Are you skilled in the SS amplifier arts?

    Uh... you could say that... compared to my sister, yes! :tongue:
    Not really I have a fairly basic view of electronics but I am slowly but surely figuring it all out.
    There was a chapter on electricity in my science book and I learned literally nothing. I actually got a B on the test because I put too much information in all the options :lol:
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  • heiney9
    heiney9 Posts: 25,080
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    If it is the bias, the questions becomes, why did the bias drift so far that it had to be dialed back? Those "pots" don't turn themselves. >:)
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • pitdogg2
    pitdogg2 Posts: 24,575
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    heiney9 wrote: »
    If it is the bias, the questions becomes, why did the bias drift so far that it had to be dialed back? Those "pots" don't turn themselves. >:)

    correct Brock but they do drift without being turned. Is it cap's of something else in the path I do not know. I have had more than one amp that needed recalibrated and I never turned anything. Once recalibrated they played on for many years.
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