Two blown fuses in one day

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Viewing 14 posts - 16 through 29 (of 29 total)
  • Author
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  • #665
    chungjh
    Participant

    I was afraid to put the new fuse in. Dr. West sent me a new bias supply and an electronic service guy is soldering it in. I should have it tomorrow.

    #666
    kingdeezie
    Participant

    Nice! Good luck. Hope everything going well!

    #667
    chungjh
    Participant

    I replaced the bias supply of the back plate that blew the fuse. However, the Conrad Johnson Premier 12 amp (140W) monoblocks still refused to play. Thinking that there is a problem with the amp, I borrowed Brooklyn Amp, a class D 300 W amp and it played fine. So, I was convinced that something was wrong with Premier 12 and returned it. Because Conrad Johnson is near me, they lent me their LP140M, a newer 140W mono block. This time it made sound. However, I hear distortion at a normal volume. I am either clipping or overdriving, but I played at this volume before with X250.5 Pass Labs amp without problems.With my tiny room (9×11), I thought 140W would be sufficient,especially many SL users drive them with Atma-Sphere MA-1, which is also 140W. I am very puzzled. I know these Conrad Johnsons have no problem with large Mark Logans CLX. Is there something unusual with SL speakers compared to other ESLs?

    #669
    John V
    Participant

    When you turn up the bias can you get to a point where the panel crackles?

    #670
    chungjh
    Participant

    I get crackles when the bias is turned up.

    #671
    John V
    Participant

    Is the other panel operating properly? If so I would try swapping backplates to try and determine it the issue is with the panel or the backplate.

    #672
    yoshi
    Participant

    The new regulated bias supplies have much more output than the older bias supplies. I could operate the old bias supplies at 70 % (1:30 on the bias dial). The new regulated bias supplies on my new 560 base-focused panels start to pop on heavy bass material at 9:30 on the bias pot. So. Expect there will be a difference in the new bias pot setting. Your Altitude and humidity levels will affect the setting level.

    Ken

    #673
    chungjh
    Participant

    John

    You misunderstood me. Both speakers are distorting. Problem is not in the speakers because SLs work great with a backup class D 300W amp

    #674
    John V
    Participant

    Got it, I misread your post. Sorry. It does sound like clipping.
    The CLX may be easier to drive than your SL’s. Its also hard to compare your CJ to an OTL amplifier like the MA1.

    I ran into a similar situation at one point. I bought a pair of Mac
    MK1.2Kw monoblocks, they would not drive my U1’s without clipping.
    I guess the Macs couldn’t handle the rising impedance of the SL’s
    so I sold them and moved on.

    #675
    chungjh
    Participant

    John

    What pre and power amp are you using now?

    #676
    John V
    Participant

    I’m currently in the process of updating my system. For years I’ve used a Crown Macro and Tact 2.2xp. The Crown, not well regarded in the
    High End, but worked well for me over the years.
    Anyhow, I’m waiting for a pair of Atma Sphere MA-2’s to be returned from AM for some cosmetic upgrades. As to the pre amp, I just received
    a used Anthem STR.
    CD/Streamer is next, not sure what I’ll get there.
    As to vinyl, I have a Goldmund Reference Turntable that I recently refurbed.

    #684
    kingdeezie
    Participant

    Interesting development. I’m wondering if the amp wasn’t the culprit the whole time.

    Tubes are wonderful, but in amplifiers they can go nuclear. I used to have Manleys and one time a tube went rogue.

    Took out a resistor in the amp when it went. Had to have it repaired.

    Hope things stay working well for you! Enjoy.

    #752
    chungjh
    Participant

    I replaced the bias supply on one back plate that was blowing fuses and it works very well. But, I noticed that the other panel some times goes quieter than the other and sometimes refuses to crackle no matter the gain. So, I replaced the bias supply for that one too, and now everything is good again.Roger tells me that this is the first failure of the regulated bias that he has been using for the past several years.

    #754
    hpfish10
    Participant

    Good to know you replaced bias supply it crackles now. I need to replace my bias supply since i could not make my left speaker crackle even after swapping back plates.

Viewing 14 posts - 16 through 29 (of 29 total)
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