20 Most Recent Radio Shack 250 Watt PA Amplifier Amplifier Questions & Answers

I had this problem to the only stereo rca input I could find was the top red and white. Everything else is mono, I'm currently working with 1.so if you have any advice please let me know.

Radio Shack 250... | Answered on Jan 06, 2018

One important note to be aware of Polarity. DC connections are Positive + and Negative -. RED/Black and/or White wires. Yellow is usually Video. Do not Reverse the polarity as this can cause mismatches and/or short circuits. Disconnect your attached wires and re-attach them correctly and firmly. Wires must be set into or onto the posts or connection points correctly by + or - and they may not touch one another. Check the Reset or Fuse on the amp and make certain you have full power.
If you fail to polarize correctly, you could damage the speakers moreso than the Amp.

Radio Shack 250... | Answered on Jan 07, 2014

There's a very real possibility that your output stage transistors got fried.

Radio Shack 250... | Answered on Nov 07, 2013

Fuses are inside next to power supply transformer.

Radio Shack 250... | Answered on Nov 06, 2013

It's possible this has two fuses. Check to see if either is blown and reset/replace. If not, then the "channel" (side) that won't work has been damaged and will be difficult to replace.

Radio Shack 250... | Answered on Sep 17, 2013

Connect Nortel PABX external page port output to the amp input.

Either by phone plug or RCA connector, any of the two will work.

Radio Shack 250... | Answered on Aug 06, 2012

you may need to have like one of these:

Microphone Mixer - Radio Shack

Radio Shack 250... | Answered on Aug 06, 2012

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause for intermittent shutdown.

Radio Shack 250... | Answered on May 29, 2012

You have to check the ohms of the speakers all spekers should be 8 Ohms or above. if not it will overload the amplifier at high level. The minium ohms impedence of the amplifier is 4 ohms. If you connect two 8 ohms speakers together then the effective ohms will be 4 OHMS then the amp will handle the speakers. If you connect two 4 ohms spekers together then the effective ohms will be 2 Ohms, this will overload the amplifier. You will be able to connect two 8 ohms speaker to left channel or right channel of the amplifier. Check the speaker spesifiction to know its ohms. Make sure all the speakers have an impedence of 8 OHMS or above

Radio Shack 250... | Answered on Aug 19, 2011

You haven't sufficiently defined what is wrong. "Not good" is subjective. Before you shell out for different hardware you should pinpoint the problem.

The source (you, mics) and the speakers are the most obvious sources of sound quality issues. Properly functioning amplifiers operated within their limits produce effectively undetectable differences in the sound.

Feedback from the speakers to the mics will sound awful.

Radio Shack 250... | Answered on Jul 07, 2011

Yes. It won't be great, but if you're starting out you should be ok. Musiciansfriend.com has some of the more popular pa options - generally radioshack=bad.

Radio Shack 250... | Answered on Mar 05, 2011

What are you using, a mic? guitar?

Radio Shack 250... | Answered on Sep 01, 2010

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