Luxman R-115 and RTA-12c

kauai822
kauai822 Posts: 10
edited August 2013 in Vintage Speakers
I am using a Luxman R-115 as a preamp to my Carver M1.0t amp. I am now hearing a thump in my RTA-12c about three to five seconds after I turn the R-115 off. This just started in the last couple of days. Even when I turn the carver off first and then the Luxman I still get a thump. Does any one know or can someone give me a diagnosis of the probable problem. I was thinking that the Luxman needs a new on/off button. Any thoughts or comments would be appreciated. I don't want to damage the RTA's.:sad:
Post edited by kauai822 on
· Share on FacebookShare on Twitter

Comments

  • EndersShadow
    EndersShadow Posts: 17,590
    edited August 2013
    I dont think its the Luxman personally, but I could be wrong. Carver M1.0t's are notorious for doing that. I am betting if you turn off the Carver amp with the luxman still on and wait 3-5 seconds the thump will happen.

    There are 2 forums with instructions on how to fix that issue (its commonly referred to as the "thump fix"). Those sites are: CarverAudio.com and TheCarverSite.com. There are some folks here that are on those forums that might be able to point you to the direct links, but I dont have those on me.

    I can tell you my M1.0t did this exact same thing and I am in the process of getting the "thump fix" applied to my amp.
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
    · Share on FacebookShare on Twitter
  • soundfreak1
    soundfreak1 Posts: 3,414
    edited August 2013
    There are several amp brands that start doing that, its prob a cap discharging after shut down. Dont know what the fix is however i would maybe put a risistor or something ( maybe someone more knowledgeable will chime in). To protect your speakers couse if you are hearing that discharge " its hitting the drivers" that cant be good for them!
    Main Rig:
    Krell KAV 250a biamped to mid/highs
    Parasound HCA1500A biamped to lows
    Nakamichi EC100 Active xover
    MIT exp 1 ic's
    Perreaux SA33 class A preamp
    AQ kingcobra ic's
    OPPO 83 CDP
    Lehmann audio black cube SE phono pre, Audioquest phono wire (ITA1/1)
    Denon DP-1200 TT. AToc9ML MC cart.
    Monster HTS 3600 power conditioner
    ADS L1590/2 Biamped
    MIT exps2 speaker cable
    · Share on FacebookShare on Twitter
  • kauai822
    kauai822 Posts: 10
    edited August 2013
    I have researched further turning each unit on and off in different sequence. Unfortunately it seems I have a problem with both the Luxman and the caver amp. The amp has the Carver thump issue as stated in an earlier post. The Luxman puts out a thump when first turns on. I am using the Luxman r-115 as a preamp. I recently bought a Sherbourn/Emotiva Pre-1 preamp which I will get at the end of the month as it is back ordered. That will take care of one problem. Now to do research on the carver amp. Does anyone know what causes the thump in the Luxman ?
    · Share on FacebookShare on Twitter