Amp and/or Preamp problem

rromeo923
rromeo923 Posts: 1,513
edited November 2013 in 2 Channel Audio
Amp= Conrad Johnson MF2200 (solidstate)
Pre= Conrad Johnson PV2 (tube)

When I turn on there is no sound for about 30 seconds or so. Then it kiicks in. Previously it was doing this but only in left channel.

After sound starts all is fine.

Any ideas??
I got static in my head
The reflected sound of everything
Post edited by rromeo923 on
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Comments

  • michaeljhsda2
    michaeljhsda2 Posts: 2,184
    edited November 2013
    Cold solder joint somewhere?
    SDA SRS 2.3TL's
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    Yaqin MS-20L integrated tube amp
    SDA 2B TL's
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  • gmcman
    gmcman Posts: 1,806
    edited November 2013
    How long have you had the preamp? Reason I ask is some tube equipment need a brief warmup.
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  • rromeo923
    rromeo923 Posts: 1,513
    edited November 2013
    I have had the preamp for a year or two. I always turn on the pre first. I turned on and then waited a few minutes till I powered up the amp and still problem. I think it is the amp.
    I got static in my head
    The reflected sound of everything
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  • gmcman
    gmcman Posts: 1,806
    edited November 2013
    Any way you can swap an amp or a preamp? I haven't used any tube equipment but could this be a tube going out?
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  • Msabot1
    Msabot1 Posts: 2,098
    edited November 2013
    Let the pre warm up 30 minutes before turning on the amp...tubes need to get to ramp up their temp before they can operate properly. That might be the whole prob.
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  • skrol
    skrol Posts: 3,375
    edited November 2013
    Is there a relay in the amp circuit? Relays have a tendency to age and can cause such symptoms due to dirty contacts or mechanical wear or sticky lubricants.
    Stan

    Main 2ch:
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    HT:
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    Other stuff:
    Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601
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  • Glen B
    Glen B Posts: 269
    edited November 2013
    Definitely sounds like a problem with the amplifier output relay, or aging component in the relay driver circuit.
    Main System: Denon DP-59L | Audio-Technica AT33EV | Marantz SA-11S2 | Classe DR-10 | Classe CA-300 | Classe RC-1 | PSB Stratus Gold i's | DIY Balanced AC Power Conditioner | Acoustic Zen and NeoTech cables | Oyaide and Furutech power connectors | Dedicated 20A isolated ground line.

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  • BlueFox
    BlueFox Posts: 15,251
    edited November 2013
    rromeo923 wrote: »
    When I turn on there is no sound for about 30 seconds or so. Then it kiicks in. Previously it was doing this but only in left channel.

    This could be normal operation, and when only the left channel was doing this then that was wrong. My Cambridge-Audio 840W amps were the same way. Turn on, and they went through some initialization phase before starting to play.
    Lumin X1 file player, Westminster Labs interconnect cable
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  • F1nut
    F1nut Posts: 50,557
    edited November 2013
    I thinking a relay problem as noted by skrol and Glen B.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

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  • headrott
    headrott Posts: 5,496
    edited November 2013
    Yep. Relay in the amp.
    Relayer-Big-O-Poster.jpg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:
    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion." :\
    My response is: If you need 60 seconds to respond in one sentence, you probably should't be evaluating Polk speakers.....

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee
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