amp repair

  1. M

    SWR amp - no sound - help troubleshooting

    I have a SWR Workingman's 10 bass combo (and extension cab - not currently connected). All the sudden won't put out anything at all. It lights up, but there is no sound whatsoever no matter what I do. I have cleaned and exorcised all the jacks, tired each setting on the switch on the back (full...
  2. mezatron

    Fender Bassman TV Duo Ten Broken XLR Out

    I picked up one of these bad boys a few months back and I love it. But turns out that the XLR Line Out is jacked up. I tried using it with my audio interface and i got nothing but static. The amp works perfectly fine otherwise, so I’m assuming that the line out issue is separated from the rest...
  3. M

    GBE 750 Genz Benz

    I have recently acquired a GBE 750. Upon inspection of the amp it is in need of repair. I am unsure who to reach out to as Genz Benz is now defunct. I had one of these years ago and I very much loved it, would love if I could have this one repaired as close to new condition as possible. My...
  4. Bassowitz

    Ampeg SVT 3 Pro Clipping/Distorting?

    Hey, all. I recently bought a used SVT 3 Pro. I tested it before buying and used it for a band practice, and it worked perfectly fine; last night, I noticed something strange. I turned it on, waited for the LED to light, and unmuted it. When I started playing, it clipped/distorted (or farted...
    • Bassowitz
    • Thread
    • amp advice amp question amp repair ampeg ampeg svt3 pro amplfier bass help tube preamp
    • Replies: 24
    • Forum: Amps and Cabs [BG]
  5. jackotheclown

    Markbass Mini CMD 121P combo amp issues

    Hey chaps, I've had my little Markbass combo for 11 years now. Ever since I moved to the US. It's been my main workhorse here in NYC but in the last few months it's stopped working. The lights are on but no ones home! No sound, when I turn it on. As soon as I turn it off you hear sound for a...
  6. javableak

    SWR HeadLite Schematic...Impossible to find.

    I have an SWR HeadLite amp in the shop for repairs. A schematic would make things easier, but I can't find it. Does anyone have one? Where can I get one? I know SWR was bought by Fender. I've sent an email, but I haven't heard back. There must be the schematics for this little amp somewhere...
  7. Brongle

    Fiery Acoustic Model 220 resistor

    I recently picked up an Acoustic 220 for cheap. When I got my hands on it I popped it open to make sure there wasn’t anything super risky afoot. After plugging it in I was greeted with the magic white smoke and the smell of brimstone. Upon closer inspection a resistor in the power amp decided...
  8. T

    Orange Bass Terror 1000 power supply issues

    Wondering if anyone has a schematic for the 1000 version of this amp. When I first got this amp, it would blow the external fuse immediately. I replaced the mosfets which I found were faulty and the SMPS ic chip. The fuse no longer blows. I have it in series with a lightbulb to save myself from...
    • ThunderNuts
    • Thread
    • amp repair bass amp repair class d class d bass amp orange orange terror bass smps tb1000
    • Replies: 5
    • Forum: Amps and Cabs [BG]
  9. F

    Fuchs discontinuing Walter Woods and Acoustic Image service

    Sorry to announce we are no longer accepting Woods or AI amps for repair. In the case of the Woods amps, we're running into a brick wall with devices having their numbers removed, so replacement is basically impossible. With the devices we CAN identify, we're finding many to be obsolete. While...
  10. Andy759

    Markbass 121 New Yorker Amp Head Replacement

    Hi all, It's the first time I am posting on talk bass having been an avid fan for a long time. I have an issue with my combo. One of the parts inside the head has "blown" (literally caught on fire) and having taken it to an amp tech, it'll cost almost as much to repair it as it would to buy...
  11. S

    Orange OB1-300 Amp Repair HELP

    Hey there! I need some help figuring out and identifying some resistors in my amp. Long story short, years ago was playing a gig and liquid (definitely beer I play punks shows and people fling beer around sometimes) got into my amp and it blew up. Years later I hung onto it and have been taking...
  12. W

    1969 B15-N Repair

    Hey All, I have a few questions I’m wondering if anyone could help me out with on a ‘69 B15-N. I got it as a standalone head in really bad shape. Someone tried (and failed pretty miserably) to convert it to a b18x. B18x transformers, 7027’s etc. I combed the schematic and board and ordered a...
    • Wertoc
    • Thread
    • amp repair amp revamp ampeg b15 b15-n portaflex tube amp tube amp repair
    • Replies: 21
    • Forum: Amps and Cabs [BG]
  13. P

    GenzBenz volume potentiometer failing

    Hello! Newcomer here. I have a very nice Genz Benz combo GBE Series1-12T with amazing sound. The tweeter gives a bright punch when needed. Unfortunately, all 3 volume potentiometers are failing. They scratch very loud when moved and sometime all of a sudden while playing. I've already tried...
  14. tchristian

    Take it to a qualified tech - not happening

    "Take it to a qualified tech." If only if only . . . I have two used bass heads that are no longer working: an Eden WT-405 and an early model Ashdown ABM500H (serial #0519-10-99). They exhibit similar symptoms. Generally, they play well enough for a few minutes then the output becomes scratchy...
  15. Denison928

    Silent GK MB210 II in SW Florida

    So, my little neighborhood group of senior rockstars had it’s first gig yesterday. We’ve been together about 6 months or so and figured we were confident enough to do about an hour and a half of pretty good music. Until. . . Last Friday, when my 500wt GK MB210II bass amp went silent in the...
  16. bassplayer9512

    SWR Bass 350 pooped out

    Was playing a small bar gig with a buddy last night and my amp just lost volume. Upon inspection discovered it still had low volume but it was the same no matter where any of the knobs were turned. Master at 0 was the same as master at 10 and none of the other knobs did anything. I really...
  17. Serge malebrius

    Aguilar Tone Hammer 700 issue

    Hello Community! I have an Aguilar tone hammer 700 that uses an ICEpower700ASC/X. The power supply died and I tried to buy a replacement. The company does not offer that model anymore so I replaced it with a similar model: ICEpower700ASC1. The new power supply for some reason does not send...
  18. TFM94

    Sunn Solid state amp not repairable?

    Hey everyone, quick backstory: A few months ago a bought a Sunn beta lead amp from a friend of mine. It was broken and didn't have any output, and the original owner didn't want to put any time or money into getting it fixed, so I got it quite cheap. Given the current prices of these amps (and...
  19. NaiNai

    Diagnosis needed - Orange Terror Bass

    Hi, is anyone able to tell me what might be wrong with my amplifier, an Orange Terror Bass? Is it just in need of a new tube? It's new territory for me; I've never replaced an amp's tube before. After warming up in standby mode and being switched on, the amp makes weird crackles and the signal...
    • NaiNai
    • Thread
    • amp advice amp repair orange terror bass tube amp repair
    • Replies: 2
    • Forum: Amps and Cabs [BG]
  20. A

    Ampeg repair in Missouri

    I've got an Ampeg SVT 4 pro in need of a professional tech. I've taken it two 3 people here in Columbia Mo and no one knows what they're doing. I've been trying to get this thing fixed for months and the Ampeg website is confusing as it only has phone numbers but no location for repair shops...
  21. D

    WT800C Meltdown

    Our bass player has a WT800C amp that he said he thought was running hot. We pulled the cover off to observe as he played it. A few minutes in, there was some pretty spectacular arcing between R27A and the speakon output (on the low out power amp side). Before this lighting show I noticed there...
  22. sonicblue62

    Balance restored!

    Some of you may recall this thread I posted two years ago about my son's wanton destruction of my Ampeg rig: Anger management and rig repair I finally got around to fixing it, and am pretty happy with the results! The Fender-ish grill cloth on the V4 and matching Low Down Sound 1x15 cab turned...
  23. IngloriousOz

    POLL: GK 800RB worth saving?

    TL/DR I have a 90's GK 800RB that I've been using at our rehearsal space with an Ampeg fridge with no issues (despite the top of the amp getting a little warm) for the last few months. Last week we were about 5 minutes into playing when the room lights flickered and the GK crapped out, the top...
  24. munk18

    MarkBass MiniMark 802 Power up issue

    I looked around about this issue and only found a few threads discussing it, but not about my specific amp. I have a Minimark 802 I use it for small gigs. With COVID I didn't use it as much and it did sit unused for a while, at least 6 months. Well gigs came rolling in and the other day I turned...
    • munk18
    • Thread
    • amp amp repair markbass markbass 802 markbass amp combo bass amplifier
    • Replies: 23
    • Forum: Amps and Cabs [BG]
  25. cheshire21

    Early '60s Ampeg B-15N Power Transformer Question

    Hi, I'm looking at my B-15N head and the power transformer has been replaced with something non-stock. Does anyone know if the specs of this transformer match the original specs, or if it's unsafe? I'm probably going to get it replaced anyways by a tech. Thanks! Thankfully the seller says the...
  26. P

    Agedhorse appreciation thread.

    I’d just like to take a moment to acknowledge the tremendous resource/wellspring of knowledge that we have amongst us, and to start a thread where others can chime in regarding their own positive experiences with our resident amp guru. @agedhorse has not only displayed verifiable competence in...
    • punchdrunk
    • Thread
    • advice agedhorse amp amp advice amp repair goodguy guru knowledge mesa
    • Replies: 218
    • Forum: Miscellaneous [BG]
  27. S

    Sunn 200s: Potential causes for failed rectifier tube?

    Disclaimer: I'm brand new to amp repair. I will probably say lots of stupid things in here because I'm not sure I completely understand what I'm talking about... I have a Sunn 200s, new to me, that I accidentally left on standby for over 24 hours. When I came back to the amp the pilot light...
  28. M

    Phil Jones Bass Cub-100 repair -discussion

    Allright! Picture of the amp just so you know: So I have owned this amp for a few years and at some point after coming in from the cold car at about 10 degrees below freezing (centigrade) or thereabout the amp started whistling a lot when I turned it on. When it reached working temp it kind...
    • Minifoss
    • Thread
    • amp repair bg-100 broken gear capacitor phil jones repair switch mode
    • Replies: 6
    • Forum: Amps and Cabs [BG]
  29. edr

    Noisy PJB micro 7

    Feeling a little bit dumb right now and could use some advice. TLDR pjb micro 7 has background white noise, probably in power amp stage. no idea if there’s a good way to diagnose that further. Since the seller said the tweeter was busted, I bought a new tweeter but they both sound the same to...
  30. S

    Darkglass Microtubes 900 v2 not outputting to speakers

    Hey everybody. I got a brand new Microtubes 900 V2 May 2019 and I love this amp. Have literally been gigging with it since day one (stopped the USPS driver on my street to grab the package from him before he delivered it on my way to the first show I used it at). It’s never let me down until the...
  31. Hantek DSO5072P Digital Storage Oscilloscope w/Box & Accessories
    Sold

    For sale Hantek DSO5072P Digital Storage Oscilloscope w/Box & Accessories

    Used Hantek DSO5072P 2CH 70MHz 1GSa/s Digital Oscilloscope 7" TFT WVGA 100-240V IDM. Excellent condition. Click thumbnail images for full size photo: Price includes economy shipping to most U.S. locations. Paypal, Venmo, Cash App are OK. Purchased to try troubleshooting guitar amps...
    $195.00
  32. tlite

    SOLD Hantek DSO5072P Digital Storage Oscilloscope w/Box & Accessories

    Used Hantek DSO5072P 2CH 70MHz 1GSa/s Digital Oscilloscope 7" TFT WVGA 100-240V IDM. Excellent condition. Click thumbnail images for full size photo: Price includes economy shipping to most U.S. locations. Paypal, Venmo, Cash App are OK. Purchased to try troubleshooting guitar amps...
  33. E

    SWR 350x

    Hi. I was trying to open up an SWR 350x and in order to open up the cover I have to remove some hex screw on on the top of face plate. Sizing the screw with my allen key set it seems like the size is in btw 3mm and 4mm so I am assuming it is a 3.5mm screw. Does anyone happen know what the...
  34. D

    Swr workingmans 300 power supply upgrade?

    I love my old working mans 300 but it seems that the transformer may be on its way out... definitely gets warmer than it use to and i have had to repair the tracelines on the circuit board due to overheating. Has anyone attempted Replacing the transformer with a better PSU?
    • Deleted member 365158
    • Thread
    • amp repair power supply swr
    • Replies: 1
    • Forum: Amps and Cabs [BG]
  35. dwiggums

    Markbass Capacitor?

    Hey everyone! The C86 capacitor on my Little Mark 800 recently decided to catch on fire. Luckily it didn't damage the board, but it did burn through the text indicating its value. Anyone happen to know what it is or be willing to open up theirs to check so I can order a replacement? Thanks a bunch!
  36. tlite

    New Oscilloscope Day! (Now what?)

    Saw a good deal on a used one of these and pulled the trigger- I am now the proud owner of this Hantek DSO5072P: Not sure what the most common uses are for this thing- any ideas for cool stuff to try in the music realm? Most oscilloscope threads I found here mostly relate to what to buy...
  37. M

    Troubleshooting/repair an Ampeg portabass 800?

    I picked up an ampeg portabass for $10 because the guy didn't know if it worked. I plugged it in, lights turn on, receives input, and outputs via xlr, but does not output through any of the speaker ports. I have tried with working cabs, there is no sound. I can't find a service manual anywhere...
  38. esalutation

    My Ampeg B100R Rocket Bass

    Greetings all! I’ve wanted to repair this amp for awhile, and would kindly appreciate your opinion & expertise. I originally got this amp used in the late 00’s, it’s taken a beating but I always loved the sound for lower volume settings. Since it stopped working for almost a decade now, it’s...
  39. P

    Fender Rumble 500 v3 Pot Replacement

    Hey I try to look in google but I did'nt find where I can buy a master vol. Pot for a Fender rumble 500 v3 combo.. I broke it I don't know how but it happen. At the front says 30A500K At the back says RF R1660N A500k I wondering if some one can tell me where to get this.. Thanks
    • phalmmer
    • Thread
    • amp repair bass amp combo fender bass amp fender rumble 500 potentiometer potentiometers
    • Replies: 19
    • Forum: Amps and Cabs [BG]
  40. zombietag

    ampeg micro CL repair - speaker jack

    I have an Ampeg Micro CL which has been awesome. A few months ago, the thread on my speaker jack snapped off somehow. The amp was still totally functional, but the speaker jack wouldn't stay in place so I had to remove the screws for my casing, fish out the jack and then plug it in for a quick...
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