Hearing is believing...Redux!!!

2»

Comments

  • steveinazsteveinaz Posts: 17,763
    I tried to find the video I saw, but can't seem to locate it. The guy just used a multi-meter to adjust to spec after the amp warmed up. I think he mentioned in the video that Parasound sent him the specs and where to clip his leads to.
    Source: Oppo BDP-103/USB HDD | Preamp/DAC: Benchmark DAC2L | Power Amp: Parasound HCA-1500A | Speakers: PSB Imagine T2 | Cables: Kimber Hero/8TC; DH Labs D-75 | AC Power: Panamax M5300-PM
  • ManticoreManticore Posts: 133
    I appreciate the feedback. I also could not find the video specific to the same/similar
    parasound model.

    That is all I would need; I have the meter, just not the know-how &
    where to clip the leads and to confirm that the two adjustable pots Ive seen were the
    ones/one to adjust (I am sure they are). My reading of schematics is just basic
    beginner -.

    I will keep looking for now. I understood this could happen from the get go
    with this being up to a 20 year old amp. I am still very pleased with the purchase.

    If anyone does happen to see this video I would absolutely appreciate the link or any
    other useful info.

    Denon AVR X4200W
    Parasound HCA 1500A amplifier
    Adcom GFA 555 amplifier
    LG 65" Ultra HD4k
    Samsung BD J5100
    Denon DVM 4800
    Denon DP 3000 turntable
    Saec 308sx tonearm w/
    Dynavector 20A2 cart
    NAD pp 4 Phono Preamp
    MIT Avt3 Speaker c's
    Audio Quest Big Sur ic's
    Polk RTiA 7's
    Polk CSi A6
    Polk RTiA 3's
    Polk SDA 1C's
    Polk DSW PRO 440wi sub
    Infinity bu2 sub
    "The early Klingon gets the Gagh"
  • steveinazsteveinaz Posts: 17,763
    Try contacting Parasound.
    Source: Oppo BDP-103/USB HDD | Preamp/DAC: Benchmark DAC2L | Power Amp: Parasound HCA-1500A | Speakers: PSB Imagine T2 | Cables: Kimber Hero/8TC; DH Labs D-75 | AC Power: Panamax M5300-PM
  • SCompRacerSCompRacer Posts: 6,455
    Here is an older thread at Audiokarma that has some info. Post 18.

    http://audiokarma.org/forums/index.php?threads/parasound-hca-1500a-strange-noise.345325/
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ & Pro 11+ * Signature Series Sonore Music Server w/Deux PS* Twisted Pear Buffalo III Dual Mono ESS Sabre32 DAC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 *

  • txcoastal1txcoastal1 Posts: 7,792
    ^^^^^Good info

    Manti, make sure you give that info to any tech you use
    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures, Simaudio 780D DAC
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Modwright LS100, 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
  • txcoastal1txcoastal1 Posts: 7,792
    edited May 16
    Parasound HCA 1500a schematic attached
    dk0ajeev918v.jpg

    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures, Simaudio 780D DAC
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Modwright LS100, 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
  • ManticoreManticore Posts: 133
    SCompRacer wrote: »
    Here is an older thread at Audiokarma that has some info. Post 18.

    http://audiokarma.org/forums/index.php?threads/parasound-hca-1500a-strange-noise.345325/

    I think you hit one right out of the park!! This was just the info I needed. Thank You.

    This info has been saved on my end.

    For what I had noticed, the pots labeled TVR101 & TVR201 were the only two adjustable pots that I could find on the main board. I did not remove or disassemble the amp while looking. It was just a casual look & see.

    Now that I know the values I will check the cool side value against the warmer/hotter side and see what the readings are; before I change anything. If the cool side is @ 10mV or very close I will know what to do.

    Of course after spending several hours working in the backyard today... this will wait until at least tomorrow. I am absolutely whipped!

    Thanks you all.
    Denon AVR X4200W
    Parasound HCA 1500A amplifier
    Adcom GFA 555 amplifier
    LG 65" Ultra HD4k
    Samsung BD J5100
    Denon DVM 4800
    Denon DP 3000 turntable
    Saec 308sx tonearm w/
    Dynavector 20A2 cart
    NAD pp 4 Phono Preamp
    MIT Avt3 Speaker c's
    Audio Quest Big Sur ic's
    Polk RTiA 7's
    Polk CSi A6
    Polk RTiA 3's
    Polk SDA 1C's
    Polk DSW PRO 440wi sub
    Infinity bu2 sub
    "The early Klingon gets the Gagh"
  • ManticoreManticore Posts: 133
    txcoastal1 wrote: »
    Parasound HCA 1500a schematic attached
    dk0ajeev918v.jpg

    Much appreciated. Filed.
    Denon AVR X4200W
    Parasound HCA 1500A amplifier
    Adcom GFA 555 amplifier
    LG 65" Ultra HD4k
    Samsung BD J5100
    Denon DVM 4800
    Denon DP 3000 turntable
    Saec 308sx tonearm w/
    Dynavector 20A2 cart
    NAD pp 4 Phono Preamp
    MIT Avt3 Speaker c's
    Audio Quest Big Sur ic's
    Polk RTiA 7's
    Polk CSi A6
    Polk RTiA 3's
    Polk SDA 1C's
    Polk DSW PRO 440wi sub
    Infinity bu2 sub
    "The early Klingon gets the Gagh"
  • SCompRacerSCompRacer Posts: 6,455
    edited May 16
    Happy to help. I see plenty of .33 ohm resistors they speak of. I guess measure across any one of them. R127 through R132 are left channel emitter resistors. Says right channel same as left or are they R227 - R232?.
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ & Pro 11+ * Signature Series Sonore Music Server w/Deux PS* Twisted Pear Buffalo III Dual Mono ESS Sabre32 DAC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 *

  • ManticoreManticore Posts: 133
    SCompRacer wrote: »
    Happy to help. I see plenty of .33 ohm resistors they speak of. I guess measure across any one of them. R127 through R132 are left channel emitter resistors. Says right channel same as left or are they R227 - R232?.

    Thanks for your time in helping with my amp problem. I will know more when I pop off the top and have another look see. According to that post #18 he states
    " Tech support told me to test across .33 ohm emitter resistors".

    I would do just that. Test across them all. Not sure if its necessary but, will give it a try hopefully later today or tonight. Time permitting. So much to do on my sprawling estate, (yeah right...sprawling). If I don't do it...

    Spring and fall is the most work around the property. Have to keep the love of my life happy...
    77lm58qelbp0.png




    and my wife too. :*
    Denon AVR X4200W
    Parasound HCA 1500A amplifier
    Adcom GFA 555 amplifier
    LG 65" Ultra HD4k
    Samsung BD J5100
    Denon DVM 4800
    Denon DP 3000 turntable
    Saec 308sx tonearm w/
    Dynavector 20A2 cart
    NAD pp 4 Phono Preamp
    MIT Avt3 Speaker c's
    Audio Quest Big Sur ic's
    Polk RTiA 7's
    Polk CSi A6
    Polk RTiA 3's
    Polk SDA 1C's
    Polk DSW PRO 440wi sub
    Infinity bu2 sub
    "The early Klingon gets the Gagh"
  • txcoastal1txcoastal1 Posts: 7,792
    Man that's awesome even saved the trip and expense to the doctor

    Education for all included

    Happy listening

    2-channel: Modwright KWI-200 Integrated, Dynaudio C1-II Signatures, Simaudio 780D DAC
    Desktop rig: LSi7, Polk 110sub, Dayens Ampino amp, W4S DAC/pre, Sonos, JRiver
    Gear on standby: Melody 101 tube pre, Modwright LS100, 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
  • tonybtonyb Posts: 27,357
    That info Rich posted was obviously helpful, glad you got the amp to where it should be. That will certainly improve the sound and it's life cycle.
    legacy Focus 20/20
    Butler tdb 2250
    Cary Xciter dac
    Joule LA-100
    Pioneer BDP 320
    Sony 4k 55 850c
    FX 500 surround
    Acoustic zen Satori SC's
    Pioneer elite vsx21
    Sonos-Cullen mod.
    Audio Metallurgy GA-0 digital
    PS Audio Quintet
    Analysis Plus crystal ovals
    Acoustic zen Matrix 2's IC
  • ManticoreManticore Posts: 133
    txcoastal1 wrote: »
    Man that's awesome even saved the trip and expense to the doctor

    Education for all included

    Happy listening

    Thanks for the schematic and yes its nice to save a buck or two. Eventually this unit will be sent out for a refresh.
    tonyb wrote: »
    That info Rich posted was obviously helpful, glad you got the amp to where it should be. That will certainly improve the sound and it's life cycle.

    The info from Rich was the only reason this was able to be done. Thanks Rich :) :) :)

    Funny you say that about the sound. I thought is was only wishful thinking but, it did sound better. I guess it shows one should trust their ears...most of the time.
    Denon AVR X4200W
    Parasound HCA 1500A amplifier
    Adcom GFA 555 amplifier
    LG 65" Ultra HD4k
    Samsung BD J5100
    Denon DVM 4800
    Denon DP 3000 turntable
    Saec 308sx tonearm w/
    Dynavector 20A2 cart
    NAD pp 4 Phono Preamp
    MIT Avt3 Speaker c's
    Audio Quest Big Sur ic's
    Polk RTiA 7's
    Polk CSi A6
    Polk RTiA 3's
    Polk SDA 1C's
    Polk DSW PRO 440wi sub
    Infinity bu2 sub
    "The early Klingon gets the Gagh"
  • tonybtonyb Posts: 27,357
    Manticore wrote: »
    Funny you say that about the sound. I thought is was only wishful thinking but, it did sound better. I guess it shows one should trust their ears...most of the time.

    Won't get an argument from anyone about trusting your ears. ;) Even though mine isn't all that great, I can still pick out the sound of an Espresso being made from like 2.5 miles away. :)
    legacy Focus 20/20
    Butler tdb 2250
    Cary Xciter dac
    Joule LA-100
    Pioneer BDP 320
    Sony 4k 55 850c
    FX 500 surround
    Acoustic zen Satori SC's
    Pioneer elite vsx21
    Sonos-Cullen mod.
    Audio Metallurgy GA-0 digital
    PS Audio Quintet
    Analysis Plus crystal ovals
    Acoustic zen Matrix 2's IC
  • ManticoreManticore Posts: 133
    [/quote]

    I can still pick out the sound of an Espresso being made from like 2.5 miles away. :) [/quote]

    /\/\/\I should have added, send a box of Cannoli's with every speaker purchase, as long as we get to choose where they come from.

    Sounds great. I still have not found a decent cannoli anywhere near where I live,
    Or a good bakery,
    Or good pizza,
    Or good... well... just about anything worth raving about food wise. :(
    Denon AVR X4200W
    Parasound HCA 1500A amplifier
    Adcom GFA 555 amplifier
    LG 65" Ultra HD4k
    Samsung BD J5100
    Denon DVM 4800
    Denon DP 3000 turntable
    Saec 308sx tonearm w/
    Dynavector 20A2 cart
    NAD pp 4 Phono Preamp
    MIT Avt3 Speaker c's
    Audio Quest Big Sur ic's
    Polk RTiA 7's
    Polk CSi A6
    Polk RTiA 3's
    Polk SDA 1C's
    Polk DSW PRO 440wi sub
    Infinity bu2 sub
    "The early Klingon gets the Gagh"
  • steveinazsteveinaz Posts: 17,763
    I was gonna say, the adjusting points are hyper sensitive--but I see you got it.
    Source: Oppo BDP-103/USB HDD | Preamp/DAC: Benchmark DAC2L | Power Amp: Parasound HCA-1500A | Speakers: PSB Imagine T2 | Cables: Kimber Hero/8TC; DH Labs D-75 | AC Power: Panamax M5300-PM
  • motorhead43026motorhead43026 Posts: 1,958
    I also adjusted the bias on my 1500 last night, very simple process. The bias was really off both channels. I was really surprised the difference it made.



    Main System: Anthem 225 Integrated amp; Parasound Ztuner; TechnicsTT SL1350; Vincent PHO-8 phono pre; Marantz CD6005 spinner; Polk Signature S60's
    Wire: Wireworld Eclipse IC, Audio Art IC3; Speaker cable LA International SS-800; PS Audio AC-3 power cords; All into a PS Audio Dectet Power center.

    All TV's sound enhanced by Polk Magnfi Mini's.

    Other; SDA2BTL's, M10 series II, M7C's, Hafler XL600 amp, Parasound HCA-1500 amp , P5 preamp, all in storage.
  • ManticoreManticore Posts: 133
    steveinaz wrote: »
    I was gonna say, the adjusting points are hyper sensitive--but I see you got it.

    As they say up here in New England (wicked) sensitive. Man I dislike that saying. :|
    But when in Rome...

    After I noticed how sensitive the pots were I worked them back and forth a bit with the power off to see if I could work out any corrosion or whatever. I am going to check the readings again in a week or so to see if the settings stayed about 10mV.

    Steve I think you said you had to or were going to do yours when you have some free time. I would be curious to hear if yours were way off or not.

    Denon AVR X4200W
    Parasound HCA 1500A amplifier
    Adcom GFA 555 amplifier
    LG 65" Ultra HD4k
    Samsung BD J5100
    Denon DVM 4800
    Denon DP 3000 turntable
    Saec 308sx tonearm w/
    Dynavector 20A2 cart
    NAD pp 4 Phono Preamp
    MIT Avt3 Speaker c's
    Audio Quest Big Sur ic's
    Polk RTiA 7's
    Polk CSi A6
    Polk RTiA 3's
    Polk SDA 1C's
    Polk DSW PRO 440wi sub
    Infinity bu2 sub
    "The early Klingon gets the Gagh"
  • ManticoreManticore Posts: 133
    I also adjusted the bias on my 1500 last night, very simple process. The bias was really off both channels. I was really surprised the difference it made.

    OK this is starting to look like the norm. The difference was noticeable. I am very glad to be able to do this myself.

    This makes me curious if the signal changed where I would have to rerun audyssey.

    When listening in two channel I use the direct setting so there would be no change but for HT I use the room correction.
    Denon AVR X4200W
    Parasound HCA 1500A amplifier
    Adcom GFA 555 amplifier
    LG 65" Ultra HD4k
    Samsung BD J5100
    Denon DVM 4800
    Denon DP 3000 turntable
    Saec 308sx tonearm w/
    Dynavector 20A2 cart
    NAD pp 4 Phono Preamp
    MIT Avt3 Speaker c's
    Audio Quest Big Sur ic's
    Polk RTiA 7's
    Polk CSi A6
    Polk RTiA 3's
    Polk SDA 1C's
    Polk DSW PRO 440wi sub
    Infinity bu2 sub
    "The early Klingon gets the Gagh"
2»
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!