Question about Washburn Amplifiers: 25 WATT Guitar Amplifier - Bad Dog - BD25R Car Audio Amplifier

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Washburn sx25b amp, has power but only output is hum. Checking with signal generator gives loud sound anywhere past resistors on board input. Resistors check ok, electrolytic capacitors 2.2uf 50v and 0.1uf 50v seem ok, but without schematic is hard to work out what's what. Hitting tops of capacitors with generator produces signal and farther down board blows you out of the room. Chris

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Haven't worked on one of these in years, however, it's probably the same basic system. The filter cap(s) in the power supply normally serve to block the 60 hz AC hum, and they will be your most likely culprit. They can be anywhere from 100, 220, or 500 uf, and are usually the larger caps in the supply. They always used to put one on the output of a bridge rectifier, in case you have that design. Good luck, thanks for using FixYa, and hope this helps.

Posted on Aug 25, 2010

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1 Answer

Washburn sx25B amp serial number 88020006 when made how much were they?


The amp produces 25 watts of power and uses 80 watts of ac power to do it.
Your other questions are best answered by Washburn customer service.
Contact Washburn Guitars

Aug 05, 2016 | Washburn Music

1 Answer

Benwin 5.1 surround sound system Humming loudly without anything pluged into it!!!


It is sad your having a problem with your
Benwin 5.1 surround sound system
If humming can be heard on all speakers, then it could probably

be on the power supply.


If it is only on the main SUB unit, then it could be the amp itself.

But check for power supply capacitors that supplies voltages to the

amps.Check for amp output DC voltages too.

Oct 04, 2012 | Audio Players & Recorders

1 Answer

Input 60Hz hum


i had the same problem once and in my case i had accidentally used ground wire for signal. pls check ur connections again. one check u can do is set the high pass filter to 70Hz and see if that cuts out the low hum.

May 01, 2010 | Crown CTS600 2-Channel Amplifier

1 Answer

Making loud humming noise only.but if you plug


If I understand this correctly: with NO input or cable attached it hums; with an RCA cable attached it works. (What does 'some' mean in this regard?)

You say that connecting the RCA cable improves its sound. That tells me you're supplying a ground through the RCA cable for stray voltage in the sub.

It seems there may be a basic power issue if it hums with no input. Sometimes a given power source in a home may be wired differently than others or may insufficient grounding, which can result in hum. Try reversing the sub's power plug or move it somewhere else.

Since the sub contains its own electronics it is also susceptible to strong external magnetic fields. Keep it and any signal cables leading to it some distance away from other electrical devices like TV's.

Apr 08, 2010 | Velodyne CT-100 Speaker

1 Answer

Yamaha Portable piano - Loud 50Hz sound only on mains


MAKE IT THIS WAY FRIEND, IF YOUR POWER INPUT IS OK, AND THE OUTPUT IS FINE, THEN GO FORWARD FOR THE NEXT STEP, IF YOUR LA4558, (2CHANNEL AUDIO OUTPUT IC) IS HEATING UP, THEN JUST CHANGE THE IC, ALSO CHECK FOR CAPACITORS, ANY SIGNAL DIODES IF HAD DAMAGED, AND RESISTORS NEARBY...CHANGE THE AUDIO AMP

Oct 16, 2009 | Music

1 Answer

Humming speakers


If you disconnect the signal leads and the hum is away, it's probably a groundloop problem, or your equipment is generating the hum.
If it does not go away, the amps are defective

Sep 23, 2009 | Mackie SRM-450 System

1 Answer

My sansui qs 1 immediatly stopped working and alll it does is hum can not find any burnt components


Good day sir, there are several reason why the amplifier hums, but lets go to the common ones,
  1. The main power amplifier is defective. Does the volume control affect the loudness of the hum? If no, possibly replace your main amplifier IC. if its transistorized, check the two push pull amp. for shorts.
  2. If Yes, check for shorted audio cables. just maker sure you are using a good audio cable. or
  3. The pre-amp IC is defective, usually op-amps. try replacing them one at a time. these requires unsoldering and soldering.
  4. If you want to find the faulty part, you may need to trace a signal, you may need the folowing, an audio source, sine wave generator, an oscilloscope, or a portable amplifier. This method requires you to be techie. Feed the input with the audio source (disconnect first the speakers so that the hum will not bother you.) check the output of each stage, from preamp to power amp. identifying where the heck the signal dissapper. and where the start humming appears.
The third one requires a lot of work, just bring it to a service center.
Hope this helps, feel free to ask again, let me know your progress. Thanks

Jul 27, 2009 | Audio Players & Recorders

1 Answer

JBL d110 /w no sound output


There is a standby indication that activates after 10-15 minutes without any input signal. I suspect that might be what the red light is telling you - no signal.

Loud hum from a loosened cable is normal as hum usually means there's an ungrounded connection somewhere acting as an antenna and the amp is doing its job to amplify what it thinks is a signal, in this case 60hz stray ac current is being sensed nearby. It's a good sign that you get hum from the sub because that means the amp is alive.

Avoid manipulating cable connections with the Sub or Receiver turned on as you could introduce a static spike that could harm any connected equipment.

Are you certain a bass signal is making it into the sub? The complexities of modern AV receivers vary in how you configure them to direct LFE to a sub. Bone up on that end of the chain.

Or, just hang a CD player on the Inputs of the sub and play something with a reassonable amount of Low Frequencies.

>>>> Be advised that this way of testing has NO VOLUME CONTROL because amps without volume controls always operate at maximum gain, relying on your external controls to attentuate it (hence, the loud hum from a loose cable); so choose a track that eases into the loud parts with some quiet parts up front and BE READY TO PAUSE THE PROGRAM AT ANY SIGNS OF STRESS. <<<<

A living sub will produce only muffled rumble in the absence of other speakers producing the higher frequencies which carry the intelligence of the signal. If that works, back to the receiver for settings. If not... sigh.

-----

For hum problems, even those you cause yourself:

Disconnect all inputs to see if that helps. If it goes away start with the signal cables and add in things until it comes back.

Sometimes the reversing the orientation of the AC plug can help with hum. Or it could be something like a loose or high resistance connection internal to the sub. Good luck.

Jun 17, 2008 | JBL PSW-D110 Speaker

3 Answers

Aiwa mini-component


DEAR

I UNDER STAN YOUR PROBLEAM VERY WELL,
PL CHECK FOLLOWING POINT'S

CHECK MUTE SIGNAL PATH WITH YOUR MAIN AMPLIFIER
CHECK MAIN AMPLIFIER STK BY REPLACING IT
CHECK MAIN SPEAKER'S.
CHECK BIASING CIRCUIT WITH STK INPUT
CHECK HEAD PHONE CONNECTOR BECAUSE IT GIVES OUT PUT TO MAIN AMP.

THANK YOU

Jan 24, 2008 | Aiwa AWP-ZX7 CD Shelf System

3 Answers

Loud Buzz


If the sound is more of a low hum than a buzz, you probably have bad capacitors in the power supply...Time to take it to a shop.

Sep 21, 2006 | KLH ASW10-120 Subwoofer

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