Question about Audio Players & Recorders

Open Question

Technics pre-amp switching channels

My Technics pre amp SUA900S, keeps switching between channels when I'm nowhere near it. Think it could be a dodgy rotary switch, in which case, where can I find one?

Posted by on

  • 1 more comment 
  • frankoti111 Feb 22, 2009

    My technics control Amp SU C800U (I suppose is the pre-Amp) keep moving from one channel to another on its own - when on CD, it could easily move to Tuner or AUX and could come back to position. It is annoying and keeps cutting off music or radio whatever the case.

    The Power Amp it goes with is Technics SE-A900S.

    This problem emerged approx a year now after 6 years from new.

  • wayneroberds Mar 03, 2009

    Hi petraman7,
    Yes, it's the output sources which it keeps switching between.
    I'll try to get hold of the spray you've recommended.
    Thanks for the tip!

  • Scott Frye
    Scott Frye May 11, 2010

    HI...
    How are you? Better than the amp I see.
    When you say channels do you mean sources or outputs to the power amp?
    If it's a selector switch it might just need a good spraying of De-Oxit contact cleaner.

×

5 Suggested Answers

stratcat50
  • 3 Answers

SOURCE: Crown D-150 Amp

Sounds like something was spilled into the amp and it got into the controls, switch and switch knob. As for the knob, lean the amp forward about 45 degrees and dribble hot water into the space behind the knob slowly. Try to keep the water from going inside the amp. Eventually, the knob should come off with some pulling & twisting. Once you get it off, replace both pots and the switch. If water gets into the amp just dry it up with paper towels, etc. and let it continue to dry while getting the new parts. HTH, Emory

Posted on Oct 05, 2007

  • 54 Answers

SOURCE: channel has switched off.

Make shure speaker wires are not crossed at amp or at speaker terminals. Check balance control is at center. Check sound with headphones to see if final amp to speakers is the problem. Try switching imputs on back panel from right to left see if same speaker is on,.Try all loudness controls and tape dubbing buttons to see if any are dirty.
Good Luck
BIG RED

Posted on Nov 03, 2007

SOURCE: Samson Servo 170 - 1 dodgy channel

http://www.soundonsound.com/forum/showflat.php?Cat=&Number=403253&Main=351397

Posted on Dec 17, 2007

  • 6 Answers

SOURCE: Onkyo P-3160 pre-amp doesn't output on the right

Most likely it can be fixed. One of the things that could stymie this is if there is a part that is not available. It also would be nice if a service manual or diagram is available though that might not be essential (a genuine maybe here) if the repairer is familiar with preamps in general. Of course who would repair it and what it would cost are prime considerations. I likely would be able to repair it were I still in business but I am retired and that is not the case. Nor do I believe that even were I not, that this would be possible due to Fix-Ya rules (can't solicit business).

Posted on Jul 03, 2009

caroldon
  • 17129 Answers

SOURCE: Re: Technics HD51 home stereo system (amp, tuner,

The Amplifier must have a high impedance input for the turntable to be connected. Now most of the present day amplifiers do not have this input but only the regular aux input which is designed for a larger signal . But the turntable outputs is quite low and so it requires an amplification of high order. What you can do if you need to play the turntable is to have first a preamplifier with a high impedance which is available even inkit form and can be fitted on to your system. The preamp output can be shared into the input of the source selector maybe with a switch and you willl be able to fix two RCA sockets to accept the input of the phono. This will work fine provided the shielding is done well to avoid the high feedbacck to oascillate and cause noise, the premap must be housed in a shielded cabin. On the other hand you may have to buy a universal amplifier so that the phono input is present. Definetely nothing better than a designed input. So think and decide. hope I could help; Good day

Posted on Aug 10, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Technics SL-D33 Channel drop.


There's nothing wrong with the turntable then. It's your receiver that's the problem. In order to hear a magnetic cartridge it has to go via a pre-amp. It's this pre-amp that has failed in your receiver. It's only used by a turntable so wouldn't affect anything else. You should be able to trace this pre-amp by following the turntable socket wires. It will probably be a small IC that has failed. If you look up the number you should find it.

Nov 30, 2013 | Technics Audio Players & Recorders

1 Answer

Poor sound quality from a technics SL-D210


Generally either a faulty connection to a lead or cartridge. Or a faulty Cartridge. If you switch the left and right channels of the phono leads the missing sound should move to the left and the right come to life. If it does not then there's a fault in the magnetic cartridge pre-amp in your amp.

Mar 29, 2013 | Technics Audio Players & Recorders

2 Answers

I have technics 1210 mk3d turntable, problem is its sending out a louder sound signal through the right speake than the left .... please help !


Two causes a bad cartridge, or something wrong with the pre-amp for turntables in your amp. Reversing the leads into the amp should make the poor channel go to the other side. If it doesn't it's the pre-amp. If it is the pre-amp, they are not to diffcult to fix. Most are just an IC with a few components around it.

Feb 02, 2010 | Technics SL-1210 Turntable

1 Answer

Technics su-z250 left chanel is not working


You need to determine if the fault is in the pre-amp section or power amp part. Look around for damaged or burnt parts. If you turn up the volume on the left channel and you hear a weak signal then the pre-amp will be OK. If not then start with that section. Remember the right channel will be the same as the left so compare the parts. If it looks odd in the left it might be the faulty part!
You can apply the Buzz test! Being careful not to touch the power supply parts, touch the two channels in various places with a srewdriver. On the right you should get a buzz showing the signal is there, so touch the left in the same place! And so on...PS don't short anything with the screwdriver!

Jan 02, 2010 | Technics Audio Players & Recorders

1 Answer

Technics Tape Deck RS-M227X. VU needles jump to the maximum right


More than likely the pre-amp IC has failed! Trace the wires from the VU meters back they should locate the source of the problem. Remember it will be something common to both channels!

Oct 30, 2009 | Audio Players & Recorders

1 Answer

I cant get my record deck to work on my technics sh-dv290 from the aux why


Is the aux imput for tape or cd only? Or is it a dedicated phono imput?
If it is for tape or CD only it won't work has the cartridge from the deck needs a magnetic pre-amp.
If the amp doesn't have a phono imput you can get a pre-amp for cartridges from your local electrical shop. This will plug into your deck and then into the socket of the amp.
If the aux on your amp is a phono socket, assuming the record deck is working, then the pre-amp (inside your amp) for the cartridge has failed. It generally is located near the imput socket, chances are it will be single IC. It's a fair bet the IC will have failed, they tend to be static sensitive types prone to fail at the drop of a hat!

Oct 19, 2009 | Technics SUV500 2-Channel Amplifier

2 Answers

No cable for technics


I had the same problem with my sua900s pre-amp.
If it's the same cable, you need a (I think 6 pin) mini din cable, male to male. It's sometimes called a PS2 cable (nothing to do with Play Station!). It's the same cable that runs from your mouse into your pc and is readily available for about £5 from online computer retailers. Check the number of pins first though!!

Feb 08, 2009 | Technics Audio Players & Recorders

2 Answers

Not a good sound


you can't...the technics need to be pluged into phono..because the signal has to be amplified for it to play...phono channels on amps and dj mixers have an amp built in....

Apr 06, 2008 | Technics SL-1200MK2 Turntable

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

258 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts

kakima

Level 3 Expert

101466 Answers

 Grubhead
Grubhead

Level 3 Expert

4751 Answers

The Knight
The Knight

Level 3 Expert

71611 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...