Question about SWR WorkingPro 15 200 Watt 1x15" Bass Combo Amp

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I need a new power transformer for a swr workingpro 15. I need the datasheet on the transformer.

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Try the link below to locate your local supplier.

http://locator.swramps.com/

Posted on May 26, 2011

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Where can i find a transformer for a squier 15watt practice amp.


For Fender parts and schematics, call Fender Customer Service at 800-856-9801. I will mention that the cost of replacing a transformer in a 15 watt Squier amp would lead me to just replacing the amp

Feb 02, 2015 | Squier Music

2 Answers

Swr 750x has a short


The 12ax7 preamp tubes will act just like that when they get old, in fact, this would be my 1st check before I go any further, other than ventilation and heat .Make sure you are using the right impedence output jack to match your cabinet. Make sure the effects mix level is not overriding your guitar signal. Also, make sure that your signal is not being clipped showing the red led's. Also, the variable limiter control, if turned up very high, will do that to a point similar to a compressor/limiter. I would definitely check the tubes for the crackling sound could be just that.

Mar 11, 2013 | SWR 750X Pro Series Bass Amplifier Head...

2 Answers

I've got a Adam A5X studio monitor. the problem is that fuse blows after about 15 sec. it works but you can hear background hum and the transformer gets very hot in 15 sec. then fuse blows. i wonder...


Transformers RARELY fail. It is likely that either one side of the amplifier has shorted or there is a failure in the rectifier/filter circuit of the power supply. Take it for repair unless you are adept at electronic repair. Do NOT continue to replace the fuse as you MAY cause futher damage. Use a 25 or 40 watt lamp in series with your power cord to limit current while troubleshooting.

Jul 05, 2011 | Adam Audio A5X Pair 2-way 5.5 inch...

1 Answer

My new SWR workingpro 12 has a low frequency permanent noise, any idee ? Maybe from the Power supply... Thanks, bolliger_rudolf@bluewin.ch


All amps make a small amount of noise (system hiss) but the amps own power supply should not cause a problem on it's own.
However if the frequency is around 50hz (the G 2 1/2 octaves below middle C on a piano) it is most likely due mains electricity interference or an earth (grounding) issue.
Here are a few things to try to identify the source.
  1. Could be a lack of earth (grounding) This is potentially VERY DANGEROUS and could result in electric shock if you touch a metal part of the amp or touch some other metal object (like a microphone stand at the same time as your guitar strings). Check the earth wire is firmly attached at both ends of the power supply lead.
  2. Could be a defective mains socket - try plugging it in to a different one, preferably on a totally separate circuit.
  3. Could be an earth loop. These can occur if you are using the amp with an output to a public address system or mixer that is also earthed because of a 'potential difference' between the two earths. Solution - use the balanced (xlr) output which incorporates an earth lift rather than the unbalanced jack output.
  4. Unplug any effects pedals, foot-switch etcetera to see if that eliminates the problem. Turn off any internal effects, including bass intensifier.
  5. Make sure any signal cables (guitar leads) have good quality screening and that the screen is well soldered to the jack plugs at both ends.
  6. Ensure signal leads do not lay along side (parallel) close to mains electricity cables but are well separated and only cross at right angles.
  7. Move the amp away form other electrical equipment that may have a powerful magnetic field (especially CD or DVD players, hearing loop amplifiers, radio microphone transmitters / receivers, mobile phones
  8. Turn around or stand in a different position - it might simply be the pick-ups in your guitar causing interference in the magnetic field of the power supply.
  9. Does plugging in or unplugging a signal lead / guitar make any difference? This particular amp requires only mono jack plugs a stereo (trs) plug may be shorting across terminals
  10. Does it change when you touch the strings with your hand? If yes check internal wiring and screening within the guitar.

Feb 09, 2011 | SWR Workingpro 12 200watt 1x12" Bass Combo...

1 Answer

I have an SWR workingpro 2x10c combo solid state amp. When running a signal into the standard input with all pots set at 12 o clock, the signal sounds very distorted. I have tried a basic troubleshoot,...


You haven't told us what "signal" you ran in... Make sure ALL interconnected equipment is powered from the same receptacle. All audio lines should use balanced interconnects where possible using XLR or TRS cables. Cross connect another amps preamp into the effect loop input to check the power amp portion.

Dec 15, 2010 | SWR WorkingPro 15 Amp Combo Bass

1 Answer

My swr workiongpro 15 suddenly has a very noticable hiss even when the amp is muted, and when I play the high end is more prominent than it was before.


If you are having the treble/high turned up there will be hiss. This is due to the statistical noise in electronics, including semiconductors. It is a matter of degree. The hiss should be 30 Db below your program level or so.

It is very common for one to change settings and suddenly start to notice hiss or hum at certain settings.

IF YOU CAN, go to a music store and COMPARE the amp to yours at the same setting with NOTHING plugged in. (cables and guitars can generate hiss or other noise themselves).

There is very little in your amp that would have changed to suddenly start generating hiss, so FIRST compare. This will minimize the chance of spending money at a shop to be told it is normal.

Sep 14, 2010 | SWR WorkingPro 15 200 Watt 1x15" Bass...

2 Answers

I just got this bass and am getting speaker pop at low frequencies, any ideas of what is causing this? All other frequencies sound great.


If you are driving the speaker too hard it will pop. This caused when the voice coil is driven mostly beyond the pole pieces of the magnet. Without the magnetic field the back EMF of the voice coil drops off and the current shoots up. The voice coil can't move farther so there is a discontinuity of movement which causes a pop.

200 watts is a lot to put into a 12 inch speaker so you have to be careful to not drive low frequencies at excessive volume. It is both very hard on the amp and doesn't do the speaker any good either.

If you want loud lows, you should get a subwoofer of at least 15 inch speaker to handle the lows.

Aug 04, 2010 | SWR Workingpro 12 200watt 1x12" Bass Combo...

1 Answer

SWR WorkingPro 400 watt head - no sound, Preamp Clip red LED is continually lit, Limiter green LED continually lit - fuse is perfect. It worked for a few minutes, then just stopped.


Since the PA clip is not lit, the problem seems to be up front...

First thing is to look for a bad cable as a broken ground could be putting hum at a clipping level. First thing, test this by unplugging all inputs. If the clipping light goes out, then you have bad cables or a ground loop.

Try sending a line level signal into "Effects return" to test if the power amps are OK.

If the clip light is still on, turn all gain controls down to minimum. If light is still on then take unit for servicing.

May 31, 2010 | SWR WorkingPro 15 200 Watt 1x15" Bass...

1 Answer

It is a 230 volt, I want to convert it to 120 volt. D I have to change the transformer or can I rewire the current setup.


If you can find a schematic that will answer your question. You can also open the unit and see if there are two or four wires associated with the input power to the transformer. Some can be strapped for either voltage. Finding a replacement transformer would be a real problem.

Another option would be to make an autoformer convertor using a 150 watt control transformer and use only the primary. In autoformer mode, the external transformer needs to be only half the power input sixe so a 150 watt would work. Feed the power to one of the two primaries and put the second in series to add to make 240.volts. They are a little heavy but not that bad. About half the size of a small loaf of bread. These are OFTEN available surplus for cheap.

Jan 18, 2010 | SWR WorkingPro 15 200 Watt 1x15" Bass...

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