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Amplifier or preamp problem? Sound has become faint.

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Unplug the leads from the cartridge. With your amp on. With your finger touch the left and right wires one at a time. If the amp produces a buzz which is loud, then it's good. Just hold say the right wire for some time. If the buzz stays loud, then it's the cartridge that is faulty. Or if not... If the amp has other things connected to it such as a CD and that plays OK then, it could be the pre-amp for the magnetic cartridge. This is generally a single IC which will need to be replaced.

Posted on Oct 19, 2013

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1 Answer

Why i can hear faint sound on my mixing amplifier


Depends on what sound it is. If it's a hum, then it could be a fault. If the hum is on one channel then the place to look is that channel. You can compare the good channel with the bad one for clues as to what.
If it is in both channels then you are looking at the power supply. Or something common to both channels.
Hum is most often caused by Electrolytic Capacitors.
Crackling noises are caused by resistors, or transistors, or IC's.

Jul 01, 2016 | Audio Players & Recorders

1 Answer

Amplifier works great with CD player , but with turntable the sound is poor when volume at highest


Hi. Does the amplifier have a dedicated phono input and are you using it?

If not then you will need an amp that has or an external phono preamp.

What model is your amplifier?

Jun 26, 2016 | Audio Players & Recorders

1 Answer

Does a Technics SL-J90 have a preamp?


This player does not have a pre amp. I'l send a link for the service manual, but don't try to change anything.
The element you use, is a MM or a MC (Moving Magnet or moving coil)
The MM gives about 100 times higher voltage, but still less than any modern amplifier can handle. The MC element only gives something between 0,2 and 1 mili volt.
Then if your amplifier does not have a RIAA correction, your preamp should have.
Just google around for MM and MC elements. My guess is you have the original MM element.
TECHNICS SL J90 Service Manual

Dec 27, 2014 | Technics Audio Players & Recorders

1 Answer

C370 faint crackling sound left channel


have you tried looking at your phono leads,turn volume down until it is low enough that you can still hear the music playing,give the phono leads a turn to see if its a loose connection.if not,try the right channel phono in the left channel to see if this fixes your problem.also you could do the same with your speaker leads and see if that solves the issue.maybe a bad connection is the cause?.it may also help to try and move your cd player away from your amplifier.it could also have been overdriven (played too loud for too long) on the night of the party,only you will know if this was the case or not.

Jan 07, 2013 | NAD C370 2-Channel Amplifier

1 Answer

The sound is really low if i press the aux tape cd phono or vcr the sound is there but really low


Instructions:
Evaluate your current receiver. Take a look at the back-panel connections to make sure you don't have a phono input. In most cases, the phono input will be clearly marked. If the connections are not marked, look for a set of RCA-style inputs with a grounding screw next to them; this is a phono input. If there isn't a phono input on your receiver, see if you have an open set of RCA inputs. If they are all occupied by other equipment, you can disconnect one piece of equipment, buy an A/V switcher or get a new receiver--preferably one with a phono input.
2 Purchase a phono preamp. The voltage output of a turntable is much lower than those of other peripheral devices, including CD players, tape decks and game systems. Although the inputs look the same, connecting a turntable to a standard RCA audio input will result in very faint sound output, if you hear anything at all. The output of your turntable must be amplified to a level of about 150 millivolts (mVs) before it reaches the receiver, so a turntable "pre-amplifier" or phono preamp is necessary.
3. Purchase patch cables. You'll need a set to run from the preamp to your receiver. Measure how long your cables need to be, and purchase accordingly. Resist the temptation to "go cheap," because better-quality cables will provide better sound.
4. Connect the preamp into the system. First plug the preamp into an AC power outlet. Most models have a small AC-to-DC adapter built into the plug. Then connect the cables from the turntable to the preamp, and connect your new patch cables from the preamp to the receiver.
5. Adjust the gain of the phono preamp. Most models have a gain control for fine-tuning. Follow the instructions provided by the manufacturer and adjust your system accordingly.

F150 Parts.

May 27, 2012 | Audio Players & Recorders

1 Answer

No sound from CD input, all others fine. Very faint trace of sound if volume cranked right up. Problem only on CD input.


If you follow the cd input to the pc board and trace the course of the channels, my guess is you will come accros an IC. Touching the pins of this with a tiny screwdriver (be carefull not to touch two pins at the same time) should produce a buzz on either channel. If it doesn't and there's not another IC further along the path of the signal, (that could be causing the loss) then it will most likely have gone.

Sep 15, 2009 | NAD C350 2-Channel Amplifier

2 Answers

Pioneer 6300 F


firstly, you might want to check if the resistance of your speakers (out-of-circuit) are in specs using an ohmmeter. If it's rated 4-ohms then it should be reading near 4-ohms resistance otherwise it is damaged.
secondly, if the amps can be powered 'on' make sure that it has no dc voltage in the outputs. If there is a signal source an AC voltage will dance the meter pointer which indicates that your amp is OK. Only then can you reconnect your speakers (not the damaged speakers duh!).
cheers!

Oct 13, 2008 | Pioneer GM-6300F Car Audio Amplifier

1 Answer

Amplifier will only put out "faint" music, etc, even when the volume is turned all the way up


This may sound silly, but please check to be sure that the tape monitor switch in not engaged. Update this if that is not the problem.

Dan

Sep 29, 2008 | Audio Players & Recorders

1 Answer

Suddenly dying Technics Amplifier SU-X520D


Hi

You will find that the output stages or power regulator stages have dry solder joints and may require some resoldering wherever you see them. study the whole board carefully, there may be more than one joint causing issues. If you are not well practised at soldering I strongly suggest that you get someone that can to do the soldering for you. Good Luck

regards
Graeme

Feb 26, 2008 | Audio Players & Recorders

1 Answer

My Emerson NR305TT will not produce sound. Turn table works, CD Player works, FM Tuner Works, everything works except no sound comes from the unit. The on switch and volume seem to work as I hear a faint...


You have one of 3 problems:1) bad solder joints in the amplifier or preamp section 2)defective output transistors/ICs in the power amp or 3)missing or incorrect voltages to the amp section. If the unit has a headphone jack plug in a headset. If you have sound then everything is OK thru the preamp section and your problem is in the power amp. Any competent repair shop should be able to solve this one easily.

Jun 19, 2006 | Emerson NR305TT CD Shelf System

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