Karma - Monoprice Fabulousness!

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Comments

  • monepolkmonepolk Posts: 820
    Congrats Clipdat.
  • FestYboyFestYboy Posts: 2,326
    Boooo!!!! ;)
  • Tony MTony M Posts: 5,364
    Congrats to you Drew!

    Awesome Karma Dave. B)

    Now watch how the newest amp works like a dream. :)
    Most people just listen to music and watch movies. I EXPERIENCE them.
  • anonymouseanonymouse Posts: 2,477
    congrats
  • nbrowsernbrowser Posts: 7,914
    Congrats Clipper!



    Now where's that verb guy so I can pound him into a noun??? lol
    Living room: Samsung UN55KU7000 4K UHD HDR 55 inch TV, Marantz CD6004, Pro-Ject Debut Carbon, Parasound zPhono, Mac Mini, Oppo BDP-93, XBox One S 2Tb, Kenwood DPX792BH car deck for radio purposes, Marantz SR5010 AVR, Parasound HCA-1200II, Front SDA 2 modded with Larrys Rings and RD0-194-1 tweeters, Rear Onkyo SKF-4800 Towers, Center CSiA6, BOOM Tannoy TS2.12 Sub, Audioquest Evergreen interconnects just about everywhere except from AVR to amp, MIT Terminator 4, MIT AVT3 speaker cables with extra terminals covered up Monitor 5 Jr+ in the wings for a center channel.
  • ClipdatClipdat Posts: 3,557
    edited March 31
    That feeling when you enter a drawing for a giveaway of a piece of ****, not expecting to actually win it, and then you do.

    Uh, thanks @verb, I think? I've already ordered a fire extinguisher off Amazon and I'm going to have to call Farmers Insurance on Monday to make sure my renter's insurance is up to snuff. Better to be prepared, I say.

    But in all seriousness I'm looking forward to checking this beast out. I definitely WILL be ordering some new tubes to roll into it, because why not?
    Got Dayens?
  • verbverb Posts: 2,570
    You're most welcome. We all expect one of your signature detailed reviews (walls burning, roof collapsing, cats being rescued, emergency vehicles blaring, etc.) ! And yes, how it sounds! :smiley:
    2CH: Polk SDA 1C's, Micro Seiki MB14 TT, Rotel 1580 Pre, Marantz CD6006 CDP, Carver TX8 Tuner, Conrad Johnson MF2300A Amp, Furman 15PFi Power Conditioner, AQ Diamondback (version 1) RCA IC's, MIT Terminator2 Cables
    Office: PC, Marantz AMP-1, Acoustic Technologies Classic Speakers, Polk PSWi225 wireless sub, MIT AVt2 cables, IFI Purifier2, AQ Cinnamon USB cable
  • verbverb Posts: 2,570
    F1nut wrote: »
    I'm struggling to understand why so many want a piece of gear that is likely to fail or worse. Shakes head......walks away.

    I was gonna proxy enter a number for you father @F1nut , but then thought better of it! :smiley:
    2CH: Polk SDA 1C's, Micro Seiki MB14 TT, Rotel 1580 Pre, Marantz CD6006 CDP, Carver TX8 Tuner, Conrad Johnson MF2300A Amp, Furman 15PFi Power Conditioner, AQ Diamondback (version 1) RCA IC's, MIT Terminator2 Cables
    Office: PC, Marantz AMP-1, Acoustic Technologies Classic Speakers, Polk PSWi225 wireless sub, MIT AVt2 cables, IFI Purifier2, AQ Cinnamon USB cable
  • F1nutF1nut Posts: 39,620
    Smart move.
    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."


  • ClipdatClipdat Posts: 3,557
    Because humans just can't resist FREE STUFF!
    F1nut wrote: »
    I'm struggling to understand why so many want a piece of gear that is likely to fail or worse. Shakes head......walks away.

    Got Dayens?
  • FestYboyFestYboy Posts: 2,326
    F1nut wrote: »
    I'm struggling to understand why so many want a piece of gear that is likely to fail or worse. Shakes head......walks away.

    What's life without a little adventure?
  • Tony MTony M Posts: 5,364
    Remember, third time's a charm.

    The 3rd amp just might perform well.

    Who knows. I haven't heard a tube amp in 40 years, so I took a chance. ;) :p
    Most people just listen to music and watch movies. I EXPERIENCE them.
  • verbverb Posts: 2,570
    Agreed. I'm a tube newbie, but got the bug. I picked up a Bottlehead SEX amp for the office rig to replace the Monoprice! :smile:
    2CH: Polk SDA 1C's, Micro Seiki MB14 TT, Rotel 1580 Pre, Marantz CD6006 CDP, Carver TX8 Tuner, Conrad Johnson MF2300A Amp, Furman 15PFi Power Conditioner, AQ Diamondback (version 1) RCA IC's, MIT Terminator2 Cables
    Office: PC, Marantz AMP-1, Acoustic Technologies Classic Speakers, Polk PSWi225 wireless sub, MIT AVt2 cables, IFI Purifier2, AQ Cinnamon USB cable
  • tonybtonyb Posts: 29,061
    Clipdat wrote: »
    But in all seriousness I'm looking forward to checking this beast out. I definitely WILL be ordering some new tubes to roll into it, because why not?

    Dude, I'd wait on ordering new tubes, first find out if it's stable enough to warrant the expense. Just a word of caution....do not leave that thing on while your not home. ;)

    Looking forward to the story....lol

    HT SYSTEM-
    Pioneer elite vhx 21
    Sony 4k BRP
    Tad 803 bookies
    Polk 500 surrounds
    Polk s35 center
    SVS SB-2000
    Sonos

    Music-

    Joule la-100 pre
    B&k 1403 amp
    Cary xciter dac
    Cullen modded Sonos
    ERA D5 bookies

    Cables-
    Acoustic zen Satori speaker cables
    Analysis plus crystal oval ic's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable
  • mlistens03mlistens03 Posts: 1,016
    F1nut wrote: »
    I'm struggling to understand why so many want a piece of gear that is likely to fail or worse. Shakes head......walks away.

    Cause tubes are cool! And you might as well have another amp... even if it’ll burn your house down :lol:
    2 channel
    Speakers: Mission 770 Freedoms
    Integrated amp: Technics SU-v75 and matching tuner
    CDP: Technics SL-PC20
    Cables: Monoprice, Monster, Acoustic Research, and a few generic ones
    TT: Technics SL-3200, direct drive
    Cartridge: Shure M97xE

    Pc gaming setup
    Receiver/amp: Yamaha RX-V665
    Computer: Lenovo g50 (soon to be upgraded to a Dell Precision 690 which is far from stock!!)
    Interconnects: Amazon basics HDMI, Acoustic Research HDMI, Monoprice speaker cables
    Speakers: Boston Acoustics CR75s

    Random equipment on standby:
    Onkyo TX-v940, JBL woofers and tweeters, single Klipsch KG .5, Yamaha guitar amplifier, Peavey Rage 158 guitar amplifier, Kicker comp 12” subwoofer, single Bose 802 series II, a whole bunch of 1”-3” full range drivers, Infinity Crescendo 3007s (on sale), Polk LSi25s
    txcoastal1 wrote: »

    You don't tell her you read the manual, and you tell her you know what the problem is, and you fixed it, because that what men do, fix things
    sure it has a flat response, and sure it has a lot of detail, and yes, it has good and clear lows. But is it enjoyable to listen to? Does it make you grin ear to ear? That’s what really matters.
    Seen somewhere on AudioKarma (I think)
  • ClipdatClipdat Posts: 3,557
    Fair enough. I'll let it "burn in" with the stock tubes at first.
    tonyb wrote: »
    Dude, I'd wait on ordering new tubes, first find out if it's stable enough to warrant the expense. Just a word of caution....do not leave that thing on while your not home. ;)

    Looking forward to the story....lol

    Got Dayens?
  • ClipdatClipdat Posts: 3,557
    My Karma Monoprice...thing... arrived today.

    i0wx29rxzddl.jpg
    odrp2sldrhbz.jpg

    Few things I noticed right away that just scream quality. The taller left tube's socket is skewed which makes the tube sit at an angle, it comes short of touching it's cage by just a few mm.

    It smells like electronics and glue. Like a little taste of what a transformer factory in China must smell like.

    Fit and finish on the EQ knobs, power button, and master volume knob are mediocre. Volume knob turns super smooth though. Also, I didn't take a photo of the speaker binding posts but they are very nice.

    When you power it up, it makes a pop sound come through the speakers. That's nice. Then it makes a high pitched noise for about 10 seconds until it fully turns on. At idle there is a slight hum from the amp, as well as a background noise coming through the speakers. When powered on, it continues to exude it's electronics and glue smell, although now with an added burned smell. Like melting electronics.

    Tried to play a CD through it, and as soon as the signal comes in, even with the volume knob turned down, there's a ton of static crackling. If I turn up the volume knob, I can hear the music behind the crackling and it sounds OK but there's just tons of almost constant static crackles over top of the sound.

    Tried unplugging it and then removing and re-seating all the tubes, but same symptom. So maybe a bad tube or broken solder joint somewhere?

    As it is right now it's not usable. So yeah, off to a great start here!
    Got Dayens?
  • Viking64Viking64 Posts: 2,539
    jiyspgjhhsl5.jpg
  • verbverb Posts: 2,570
    Well at least you have the fire extinguisher nearby! :smile:

    I never ran a CD through it, just the BT of which, well already documented here!

    Have fun bro! :smile:
    2CH: Polk SDA 1C's, Micro Seiki MB14 TT, Rotel 1580 Pre, Marantz CD6006 CDP, Carver TX8 Tuner, Conrad Johnson MF2300A Amp, Furman 15PFi Power Conditioner, AQ Diamondback (version 1) RCA IC's, MIT Terminator2 Cables
    Office: PC, Marantz AMP-1, Acoustic Technologies Classic Speakers, Polk PSWi225 wireless sub, MIT AVt2 cables, IFI Purifier2, AQ Cinnamon USB cable
  • Tony MTony M Posts: 5,364
    I'm going to start the Popcorn now. ;)

    I wonder what the static crackles are?
    Most people just listen to music and watch movies. I EXPERIENCE them.
  • tonybtonyb Posts: 29,061
    xgizcg9x3mzu.png
    HT SYSTEM-
    Pioneer elite vhx 21
    Sony 4k BRP
    Tad 803 bookies
    Polk 500 surrounds
    Polk s35 center
    SVS SB-2000
    Sonos

    Music-

    Joule la-100 pre
    B&k 1403 amp
    Cary xciter dac
    Cullen modded Sonos
    ERA D5 bookies

    Cables-
    Acoustic zen Satori speaker cables
    Analysis plus crystal oval ic's
    Wireworld eclipse 7 ic's
    Audio metallurgy ga-o digital cable
  • mhardy6647mhardy6647 Posts: 17,646
    edited April 14
    For those of you playing along at home, our story so far:
    F1nut wrote: »
    I'm struggling to understand why so many want a piece of gear that is likely to fail or worse. Shakes head......walks away.
    Clipdat wrote: »
    My Karma Monoprice...thing... arrived today.
    ...

    When you power it up, it makes a pop sound come through the speakers. That's nice. Then it makes a high pitched noise for about 10 seconds until it fully turns on. At idle there is a slight hum from the amp, as well as a background noise coming through the speakers. When powered on, it continues to exude it's electronics and glue smell, although now with an added burned smell. Like melting electronics.
    ...

    In all seriousness -- well, some seriousness -- such crackles are likely either poor contact of the tube pins in the sockets or a loose (e.g., cold soldered) connection or possibly a poor grounding contact (e.g., a wire with a lug on the end that is supposed to be secured to a grounded screw -- but has worked loose).

    Reseating the tubes is a good idea, but it may be that the pins are dirty and/or the "receptacles" for the pins on one or more of the tube sockets needs to be retensioned. This can be done with patience and a pair of hemostats. Tube pins may be cleaned effectively with emery cloth (wipe the pins down with a slightly damp cloth or Q-tip afterward to remove schmutz). For less severe cases, I have been known to use a bit
    of CAIG DeOxit D5 spritzed delicately onto a Q-tip. Again, follow up with a dry Q-tip or cloth. The only issue with Q-tips is to be careful of leaving cotton fibers behind. One may procure foam swabs for electronics cleaning, if one is so inclined.


    The odd thing, though, about this particular amplifier is that it's pretty well documented that the tubes don't actually do anything in it. Thus, it seems relatively unlikely that the tubes are the root cause. Not impossible, but fairly unlikely. Easily testable by wiggling the tubes in the sockets (gently) while the amp is on and connected to loudspeakers (low volume, of course).

    Another fun troubleshooting tool for loose connections and for microphonic tubes is a Tinker-Toy or a chopstick. I am guessing the application of such a tool for troubleshooting should be self-evident. ;)

    1rptpu74dtxv.png

    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • ClipdatClipdat Posts: 3,557
    Thanks. I'll try testing it again later and see if I can determine if it is the tubes that are causing the issue or if it's something else.
    Got Dayens?
  • mhardy6647mhardy6647 Posts: 17,646
    I'm guessing loose internal connection due to shipping/handling (on top of perhaps less than stellar QC).

    Guessing.
    "It's like watching a roomful of people who couldn't get through college algebra discussing the flaws of quantum physics theory. I guess it could be fun, but it's ultimately a waste of time." -- seen on audiokarma

    "Some amps run on self bias, some amps run on fixed bias. But his amps run on confirmation bias." -- seen on audioasylum

    "Writing about hifi is like dancing about architecture" -- paraphrasing some wag (possibly Frank Zappa)
  • ClipdatClipdat Posts: 3,557
    Alright, so I tried it again and it was doing the same thing when I had a CD player hooked up, so I decided to hook up my phone to the RCA input instead.

    No more static crackles! However, the static crackles returned when I increased my phone's output to the 80-100% range. If I dialed it down to like 75% volume on the phone, no static.

    So I guess this means it's not the tubes or a bad ground, but something in the preamp section being overloaded when the input signal is too "hot"?
    Got Dayens?
  • ClipdatClipdat Posts: 3,557
    So, it's sounding "good" now, but I just walked back into the room where it's playing, and the entire room smells like slightly burned/melting electronics.

    So basically this thing is putting out it's own disgusting potpourri while you use it.
    Got Dayens?
  • verbverb Posts: 2,570
    Clipdat wrote: »
    So, it's sounding "good" now, but I just walked back into the room where it's playing, and the entire room smells like slightly burned/melting electronics.

    So basically this thing is putting out it's own disgusting potpourri while you use it.

    Hmmm. Is that what you call burn in? :smiley:
    2CH: Polk SDA 1C's, Micro Seiki MB14 TT, Rotel 1580 Pre, Marantz CD6006 CDP, Carver TX8 Tuner, Conrad Johnson MF2300A Amp, Furman 15PFi Power Conditioner, AQ Diamondback (version 1) RCA IC's, MIT Terminator2 Cables
    Office: PC, Marantz AMP-1, Acoustic Technologies Classic Speakers, Polk PSWi225 wireless sub, MIT AVt2 cables, IFI Purifier2, AQ Cinnamon USB cable
  • Viking64Viking64 Posts: 2,539
    Another 80 hours of burn-in and that thing will be singing.

    xjckg4q6joyq.jpg
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