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Crate guitar amp switching from dirty to clean, like a short or something

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Hi,
Does the button on the switch wiggle around a lot? The switch itself may be broken, more specifically the spring that is supposed to hold it in one position or the other. Luckily, those types of switches are still made, and cheap. It may be worth just going ahead and having someone change the switch anyway if it will be used a lot.

Posted on Sep 27, 2008

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Hello im sorry but not speak english a litle, im need picture of power amplifier crate model spa-1200 made in u.s.a.fabricated for slm electronics,1400 ferguson ave. st louis mo. 63133 and not found...


Hi,here is the one upper version of it as "Crate SPA1400 model " 1400 watt Stereo Power Amp.they are identical ..
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When i turn on my yamaha f20 guitar amp, it produces a hissing/ static radio sound. Is it the power capacitor or something else?


Possibly interference from another electrical source. This can be compounded by high gain or the use of a distortion pedal. Try moving the amp to the middle of the room or away from things like appliances, lighting dimmer switches computer, tv etc.
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Apr 05, 2011 | Audio & Video Receivers

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Hi, i just bought a gnx-3 guitar processor and it hums loudly.


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1 Answer

My Behringer gx212 ultratwin amplifier started to lose volume last night at band practice and then I smelled buring wiring. I think I lost or am in the process of losing the amp transformer. I think the...


Hi I just recently purchased a Behringer GMX 212 and had similar volume dropout on the clean channel only Channel 2 works better and has more punch in clean mode.I went to the shop where I purchased it with a 7 day warranty from some indian dude here in Nadi Fiji, and there was another GMX 212on the floor so I decided to try it out. This was a new amp. I plugged into the clean channel and turned it up full volume on guitar and amp adn heard the volume drop of in the amp in almost a curve and then the whole amp just cut out. We unplugged and waited, turned the amp off, and then on and stil no sound. We then tried the guitar and cord in another amp. The other amp was fine. Can you solve this problem.......my gut feeling is this happens a lot to Behringer amps.

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1 Answer

Centre speaker stops functioning


Is the audio for the center channel driven by its own amp? No other channels on it or affected?

Assuming you're not cranking it up to "11" to rattle the walls...

I think what you're hearing is the protection relay dropping out - removing power from the output stages of the amp when the amp thinks something is amiss. If it turns on OK after being OFF for a while and repeats the loop you probably have a heat issue.

A solid click OFF that is not resettable would possibly be a short in the speaker path - shorted speaker wire or speaker.

Check the amp to see if it was hot to the touch or getting warmer up to the point it clicked off.

Is it ventilated properly with no heat-producing components below it? Clean out its vents and make sure it can breath. If it has a fan make sure it's working and has good airflow.

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1 Answer

Guitar amplifier cracks when turning off


So when you hit the power switch to turn it off you get a crackling sound? This is fairly common with many guitar amps as they don't have a relay which cuts the speaker output when the switch is turned off. What you are hearing is the capacitors draining down. If all else works ok with the amp then there's nothing to worry about.

Oct 06, 2008 | Audio & Video Receivers

1 Answer

I own a classic Sansui intergrated amplifier (AU-717). It has a short in one channel. At low volume, the sound shorts out. I've had this unit for about 20 years now. Otherwise, it's a great product!


Hi mellemcee


Cool amp mate, and becoming collectable now to. Sansui amps from the era where the best in the world of HiFi. iT may have lost bias control to the offending channel, it may have dirty source switches, tape monitor switch, or even speaker switching. The speaker protection relay may also have a dirty contact, will usually burst back into life with a quick rotation of the vol control. Can you pin the problem down a little more with the info i have given you, try all the controls to see if it impacts on operations, you will need to fix those problems first. Low bias would make that channel sound distorted at low levels also. Is this what is happening to you??

regards
Graeme

Apr 18, 2008 | Audio & Video Receivers

1 Answer

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Yes the tube could be what is called microphonic. In other words it behaves like a mic and feeds some signal back into the amp. These are usually 12ax7 tubes and are not expensive. Start with replacing that tube.
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Dan

Apr 07, 2008 | Audio & Video Receivers

2 Answers

70's Magnavox Console Stereo


Pull the Tuner unit out. Get some "DE-OXIT" D-5 @ Guitar center. With the power OFF and the plug pulled out from the wall, spray the De-Oxit into all the pots', and switch contacts. Rotate all the pots 50 or more times, then cycle each switch the same.

This will clean most all of the oxidation that has accumulated on the switch and pot wipers and ensure a clean contact. This may or may not rectify your problem but WILL Eliminate dirty contacts from the troubleshooting list. Also with the unit being OVER 40 years old, the capacitors will more than likely (>90%) be dried out and causing drop outs, opens and shorts in the circuits.

Hope this helps

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