Question about Parasound A 23 Amplifier

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Re: A23 AMP

If the amp hums with just speakers connected and no inputs. The problem is internal and Parasound should take care of it under their usually prompt warr. service which is still in force. 5 months sound odd. Was your dealer getting it or was it direct? If not them connect one component at a time, add preamp next(nothing connected to it). If it hums them use a 3-2 ground lifter on the AC cord of the amp and do not connect the wire to the outlet screw. If not them connect each component. If you have cable very often this will cause hum even if you are not listening to cable sound. Use a ground isolator in line with the cable RF input.

Posted on Aug 27, 2007

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Guitar amp continuous humming from speaker

Firstly, do not disconnect the speakers from the amp when it is on. Damage is possible.

You have a bad ground somewhere in the hookup. The first suspect would be your guitar-to-amp cord shielding connections at each plug, then, the wiring in your guitar. Try changing each of these to another as a trial, one at a time.

Here is Marshall's spiel on hum

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It could be the diodes, but whatever is the cause it's before the pre-amp section. Generally a loud hum such as that with no effect by volume control, is mostly caused by the filter capacitor in the power supply. And that hum is the 50HZ mains hum getting into your system!

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I have a low hum with my Carver M 400 amp. How do

If the hum disappears when you unplug the input audio cables, you need to use BALANCED lines to the amp. Read up on balanced lines and XLR connectors and TRS connectors. Find the subjects of those on google.

May 13, 2010 | Amplifiers & Preamps

1 Answer

When amp is turned on it hums.

If the hum comes out of the speakers then it could well be the large Electrolytic Capacitors in the power supply stage. Otherwise any part huming inside the amp should be replaced, though sometimes a part may hum due to a faulty part elswhere.

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It could be a grounding problem with your inputconnector.
There could be a bad connection between the jackinput and the faceplate/chassis.

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Crate amp hums when it is turned but can work at times

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Jul 31, 2009 | Amplifiers & Preamps

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 | Amplifiers & Preamps

1 Answer

Lots of hum from both speakers

Well folks I solved my problem and the amp has never sounded better. It had always hummed and now it close to stone quiet. The secret was it really never a problem with the amp. The problem was the result of either the pre-amp, interconnect cables, or the combinations of them. The solution came when I added a "drain wire" or ground to the cable I was using. There must have been a ground loop or some in-balance that required a wire to be connected to the earth (-) side at the source on the interconnect and then left unconnected at the other or receiving end of the interconnect. Anyway, no more hum, and the solution took some spare wire and solder.

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1 Answer

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Disconnect any input cables from the amp. Turn down the volume controls and disconnect the speakers. Power back on. If you still blow fuses with nothing hooked up, have the amp fixed.
If the fuse holds, shut down and connect the speakers, leaving the volume controls down. Power up and see if your fuse holds. If you have hum, an output transistor is most likely shorted. If you have no noise, SLOWLY turn up the volume controls and listen for the hum. If all is quiet, turn down the volume controls and connect your input cables and turn the volume back up. Noise? check your cables!
Mister Phil

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2 Answers

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Hi There,
Hum can come from all sorts of places in an audio amp system......
The shielding on the input cables may be broken.
An earth somewhere can be broken....which then allows "ground loops" to form and unbalances the earthing...causing HUM....

Your note about reducing the controls to zero and the hum is still there leads me to believe that the power filter capacitors or some other filter capacitor in the DC supplies have dried out.
Capacitors can also go "open" which can cause low level sound and HUM.

The motto is "Capacitors get "old" and cause hums"....
It looks like its time for a full service....the amp has done you very well over the years and its like anything else needs a service now and then to maintian the quality of sound expected...If there is one capacitor showing you its getting "HUMMY" then there will be others in there as well needing replacement....

High heat can kill an amplifier so while its getting a check over there will be checks for other problems in there as well..Hot running resistors which can dry out adjacent Capacitors...

Cheers for now YUBEUT

Nov 03, 2007 | Amplifiers & Preamps

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