Many moons since I've posted here

So, I have peeped my head in because as I recall there were a number of people here that liked B&K smps...

I posted this on another forum,

Hey guys, I’m in the process of changing up my system...Want to be able to run a wider range of speakers plus it’s time for a change ...

so Restored Marantz 1152 DC (70ish watts 8 ohms) ——-and everything else on its way out

I picked up a really nice B&K Reference 4420 amp. Opened it up, all looks nice and clean, signs of corrosion or heat related issues....

So I hooked my 1152 up as a preamp using “pre out” and a little set of infinity bookshelf speakers

when I turn on the 4420 I get a low ”bump” sound....I have cover off and don’t see anything going on that would look like it’s an issue.....but, there is a low level hum (ear to speaker, both sides) that is not affected by volume and goes off when 1152 (acting as pre) is turned off....

what do you think....?
Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's


  • audioluvraudioluvr Posts: 1,379
    Well the thump is normal and the hum sounds like a preamp issue but could be cables too. Try using some Deoxit on/ in your contact points
    Home System:
    SDA 1C's - Full mod with the help by Dave...
    1000 Va Dreadnought- w/ WireWorld Mini-Eclipse cables
    WireWorld Mini-Eclipse 7 speaker cables
    WireWorld Silver Eclipse IC's
    Cambridge Audio Azur 851N - DAC/Streamer
    B&K Reference 50 Pre/Pro
    B&K M200 Sonata Monoblocks
    BLE-Design 16mm Power Cables
    Denon DVD 2900

    Barn system:
    SDA SRS 2.3's Full mod done by myself
    Carver C-1 pre
    Carver M1.5t
    BluDenso - Bluetooth receiver/DAC
  • la2vegasla2vegas Posts: 3,736
    I have the same amplifier and have never experienced the symptoms that you have described. I also believe that your problem lies with your preamp.
  • NightfallNightfall Posts: 8,505
    I also have the same amp, it's dead quiet. I haven't heard the thump when turning it on but I turn the amp on before my preamp.

    Could the hum be a grounding issue?
    afterburnt wrote: »
    They didn't speak a word of English, they were from South Carolina.

    Village Idiot of Club Polk
  • BKphotoBKphoto Posts: 409

    I would like it recapped eventually, but in the meantime I think having a tech kick the tires a bit would be a good idea..

    I'll take some picks tomorrow

    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
  • BKphotoBKphoto Posts: 409
    A couple pics of the beast...
    Marantz 1152 DC- Denon DP 1200, Soundsmith Carmen MKII- ADS L980 - Blue Jeans IC's
  • nooshinjohnnooshinjohn Posts: 21,503
    edited October 15
    Impedance mis-match or a gain issue.
    The Gear... Carver "Statement" Mono-blocks, TriangleArt Reference SE with Pass Labs Xono Phono Preamp, Walker Precision Motor Drive, ClearAudio Goldfinger Diamond v2 cartridge and Origin Conquerer Mk3c tonearm, Polk Audio "Signature" Reference Series 1.2TL with complete mods, Pass Labs X0.2 three chassis preamp, PS Audio PerfectWave DAC MkII, Pioneer Elite SC-LX701, Oppo UDP-205 4K Blu-ray player, Sony XBR70x850B 4k, Polk audio AB700/800 "in-wall" surrounds.

    Saying that it's "too hard" to pursue your dreams is no different than admitting to yourself that you are too lazy to achieve them.

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