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Monoprice 15 watt tube amp

Discussion in 'Glowing Bottle Tube Amp Forum' started by here4thefall, Jan 25, 2016.

  1. chuckusa

    chuckusa TDPRI Member

    Age:
    36
    7
    May 20, 2018
    California USA
    Im glad some of you guys are sharing your experiences with this amp. It sounds good.
     
    ultra80096 likes this.
  2. rfxcasey

    rfxcasey TDPRI Member

    Age:
    44
    7
    Jun 8, 2018
    United States
    I just received one my Monoprice 15 watt amp so I thought I'd share my experience so far but I also have a few questions. Seems like a pretty awesome, no so little, amp so far. I was expecting this thing to be much heavier. It is louder than I expected, loud enough to cause hear damage for sure when cranked in my house. I bought the new 'improved' version, though I think I like the look of the old on better. This little sucker is mean too, lots of gain and growl, I can only imaging what you can make it sound like experimenting with tubes or modding it. The reverb tank seems much better than the old plastic one but it still seems to jangle at higher volumes. I have an old teal stripe Peavey Bandit with a Scorpion speaker in it. I was thinking about putting the Scorpion and the reverb tank from the Bandit in the Monoprice amp. Big question, does anyone know if its safe to run the Monoprice amp with the reverb tank removed entirely? I've got an Alesys Quadraverb in the FX loop so technically I don't need the mechanical reverb tank anyway. I'm thinking of getting a DOD Gunslinger and a boost or overdrive pedal to go in the front along with a wah pedal. Any thoughts or experience with that? This amp has enough gain and growl to it, it might not need a distortion pedal.
     
  3. Keefsdad

    Keefsdad Tele-Meister

    Age:
    61
    153
    Jun 4, 2018
    Toronto Canada
    I had some noise issues but i cleaned out the tube sockets a couple of times and now it's working great. I was doing some work on my Strat so i just go to try it today through the amp. It sounds great, even at low volume. I can't wait to crank it up. I'm in an apartment so I have to wait. I think my Hot Rod Deluxe is going up for sale.
     
  4. rfxcasey

    rfxcasey TDPRI Member

    Age:
    44
    7
    Jun 8, 2018
    United States
    Regarding the new reverb tanks still having a microphonics issue, I'm going to buy a reverb tank bag and see if that helps.
     
  5. rfxcasey

    rfxcasey TDPRI Member

    Age:
    44
    7
    Jun 8, 2018
    United States
    You can also get a pair of electrical safety gloves, leather over rubber, make sure they are EH rated. You can get EH rated foot ware as well that good for up to 1000 volts to keep you from becoming a good ground. Just remember if a part of you is touching metal other than your feet, you will become the path to ground at that contact point.
     
  6. rfxcasey

    rfxcasey TDPRI Member

    Age:
    44
    7
    Jun 8, 2018
    United States
    Try out a Kemper and you will become a believer.
     
  7. rfxcasey

    rfxcasey TDPRI Member

    Age:
    44
    7
    Jun 8, 2018
    United States
    What reverb tank can I replace the stock on in my version 2 with? I found some mod tanks but the impedences don't match exactly.
     
  8. ultra80096

    ultra80096 TDPRI Member

    92
    May 15, 2015
    IA
    Not doubting you a bit, but not for $1800-$2000. Not in my ballpark, & not even slightly interested in trying. I'll take your word for it.
     
    UnbrokenChainz, horax and Georox like this.
  9. cpk313

    cpk313 TDPRI Member

    36
    Apr 2, 2018
    Allentown PA
    I have a gunslinger, I think it is a great pedal, love it. I am in the process of building a bunch of VFE pedals but the gunslinger will stay, plus I got it for $28 new shipped off Reverb. That being said one of the best things I've gotten for my guitar setup is a MXR Iso-brick, went from a lot of noise, some whistling etc with pedals active to nearly silent, way quieter then a tube amp should be. I would buy one again in a heartbeat. (both)
     
  10. horax

    horax Tele-Holic

    834
    Jul 1, 2011
    colorado springs
    How does this amp compare with a vox ac15c1?
     
  11. Achysklic

    Achysklic Tele-Holic

    892
    Feb 7, 2013
    Ohio
    I’ve had both, I prefer the Monoprice the vox was way too bright.
     
    Last edited: Jun 14, 2018
    emisilly likes this.
  12. UnbrokenChainz

    UnbrokenChainz TDPRI Member

    Age:
    38
    35
    Jan 25, 2017
    San Diego
    Same experience. Put a greenback or equivalent in the MP and you get a beautiful Vox-like chime that’s not as piercing. Even though both are EL84 powered and 15 Watts, the Vox was noticeably louder with more headroom (to my ears). Bigger cab, likely a beefier OT will contribute to that.
     
  13. ericburnley

    ericburnley TDPRI Member

    Age:
    43
    3
    Jun 15, 2018
    Eureka, MO
    First post here, as this seemed to be the place i got the most info on this amp. Got my 15w in, and have played it a little so far. A bit muddy with a 335-type guitar, but still very new. I'm going to resist the urge to upgrade anything until the 70/80 is broken in. Might swap out some tubes i have lying around, but that's about it for now. 4 kids can make it difficult to find time to break a new speaker in.
    Coming from a Peavey Classic 50 2x12, this will be quite a bit lighter to cart around, which i'm looking forward to. So thanks for all the detailed info, this was an awesome deal on a solid tube amp that won't break my back!

    I will mention to the guys talking about the Caline Orange Burst, i dig that pedal & recommend it for neutral, more modern gain tones (esp for the price). And if you're looking at the Mad Professor Sweet Honey, check out Joyo's Sweet Baby - it's similar in price to the Caline, and has become one of my go-to overdrives, even with an original Nobels ODR-1, an old Analogman TS9 Brown, and a Fulldrive2.
     
    UnbrokenChainz and horax like this.
  14. ericburnley

    ericburnley TDPRI Member

    Age:
    43
    3
    Jun 15, 2018
    Eureka, MO
    V1 tube was cracked when I pulled it out - I don't think I cracked it, as I read others had damaged them upon pulling them out & was extra gentle, so it may have been already cracked and causing issues. Tried several tubes i had lying around (12AX7s and 12AU7s) and landed on an old GE 12AX7. Sounds way better already. Will still let the speaker break in before doing anything else.
     
  15. joe_cpwe

    joe_cpwe Tele-Meister Silver Supporter

    Age:
    49
    272
    Nov 27, 2017
    USA
    Definitely worth that $129.99, open box price. These amps are not great but at that price it's crazy not to check out as a spare; to keep in another room, rehearsal spot, loaner...whatever.

    I got mine on a couple stacked discounts a few months ago, $123 total and (I think) about $146 shipped.

    Pre-amp tube swaps make a huge difference.
     
  16. TimmyV

    TimmyV Tele-Holic

    531
    Aug 11, 2014
    Ohio
    8eb2c1b or 8eb3c1b any make . I have a feeling the mod tank would work best in this amp. As far as mine goes you really have to turn the reverb up to get it to do much. Mod tanks are pretty wet sounding. I’ve never seen this tank that’s in mine before but it is marked 2eb2c1b so any 8eb_c1b ( insert number ) will work. I have a mod 8eb2c1b in my parts somewhere I’m gonna hook it up and try it.
     
    Last edited: Jun 27, 2018
  17. TimmyV

    TimmyV Tele-Holic

    531
    Aug 11, 2014
    Ohio
    I hooked up an accutronics 4eb3c1b out of my hot rod Deville and a mod 8eb2c1b. Not much difference . The reverb sounds nice but kinda subtle. To me it sounded like the tanks ( all of them ) have too much resistance on the input side of the tank for this circuit. It’s kind of killing it. I just got a mod tank in the mail for another project. It’s an 8bb2c1b. Hooked that one up and I can surf with it:) . I like it, it sounds like my Fender amps reverb. But some may not . If you want a little wetter sounding reverb . I would go with either 8db2 or 3c1b or a cb or a bb keep in mind the closer you get on that second digit to the beginning of the alphabet the wetter your reverb is going to be. I have 4ab2c1b I may try. I just want to point out that reducing the input impedance opens the faucet on how much signal the op amp is putting into the tank. It may shorten the life of the IC but in my opinion I don’t think it will because I feel whoever designed this amp designed the reverb circuit for an 8bb tank and somewhere along the line an 8eb tank was used. Just my opinion but the MOD 8bb2c1b tank sounds fantastic in this amp:)
     
    Last edited: Jun 28, 2018
  18. rfxcasey

    rfxcasey TDPRI Member

    Age:
    44
    7
    Jun 8, 2018
    United States
    I bought a version 2 a couple of months ago and thought my reverb was messed up from the day I received it. When playing some notes at moderate volume I'd hear a hard to describe woosh sound like putting your ear up to a conch shell. Upon further examination it turns out one of the power tubes was microphonic. At first I thought the tube was cracked but it just had some funky glue on it that looked like a crack. I decided to pull all the tubes and inspect them. Several tubes had that some brown glue streaks on them which I scraped off with a razor. Cleaned up the tubes and they looked OK so I put them all back in and gave them the tap test. That's when I heard a loud thunk from on of the power tubes while lightly tapping it. I ordered a matched set of Ruby el84s. Does anyone know if I will have to rebias the amp? I'm also considering trying different tubes in the V1 position. Any have the schematics for this? Are they in the manual? I need to find where I put that thing, hopefully it didn't get throw out.
     
  19. rfxcasey

    rfxcasey TDPRI Member

    Age:
    44
    7
    Jun 8, 2018
    United States
    My reverb sounds pretty nice to my ears actually.
     
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