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Realistic MPA-90 DAMAGED OUTPUT TRANSISTORS - Audio Players & Recorders

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6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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pgh_pa_guy
  • 2992 Answers

SOURCE: Realistic MPA-35 amp by Radio Shack

It's not that this amp isn't like "newer amps" with + and - terminals, it's that this amp is made for public-address system use. This kind of amp is used in a store, for instance, to pump background music through speakers all over the place. The terminals you connect to are determined by total impedance of the speaker configuration used.

Most single speakers, or the two- or three-way cabinets for home stereo systems, are 8 ohms. If you're connecting a single speaker you use the "common" and "8 ohm" terminals on the rear panel. With multiple speakers, you need to figure out the total impedance and use the appropriate terminal. In series, impedances add. Two 8 ohm speakers in series would total 16 ohms, so you use the common and 16 ohm terminals. In parallel, the total impedance drops. Two 8 ohm speakers in parallel total only 4 ohms. You need to figure the total impedance of the speaker configuration and connect accordingly. Too great of a mismatch will damage the amp or speakers or both.

You might be able to find the manual for this amp on Radio Shack's website. Here's a link to the manual for the model MPA-40 which should have similar output terminals. The basic information about figuring out total impedance and general use of PA amps applies to your amp as well.

Posted on Jun 16, 2009

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  • 1 Answer

SOURCE: Looking for manual Realistic MPA-40 35W

I have a realistic mpa-40 35 -watt pa amplifier owner's manual
cat, no, 32-2032A
You can conyact me @ ltlerock@aol.com

Posted on Jan 26, 2010

dunnbiker
  • 8546 Answers

SOURCE: am looking for owner manual

http://support.radioshack.com/productinfo/ProductResults.asp?Name=PA_Amplifiers&ID=003009004

Posted on May 02, 2011

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1 Answer

How do I hook up my realistic mpa 25 20watt pa amplifier


hook up speaker common wire to com,then hook up the speaker wire to whatever ohm the pa speaker is,regular ones are 8 ohm,stay away from 70 v,plug in a record player or aux in the rca jacks you can use 12 volts or 120 volts
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Jul 21, 2015 | Audio Players & Recorders

1 Answer

How to hook speakers up to a realistic mpa-40


The MPA-40 is a mono public address amp. So it has one speaker output. You select the appropriate socket to suite the speaker type. The 4/8/16 Ohm outs are for various tpyes of Hi-Fi speaker. The 70 Volt is used for muzak in shopping centres, restaurants, and waiting rooms.


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If you have a pair of 8 ohm Hi-Fi speakers, you can diasy chain the connections and then use the Com and the 16 Ohm connection.

Daisy chain means you take the wires from a pair of speakers. Connect together the wires going to red on one speaker and black on the other. This now leaves you with two wires going to the other red and black terminals on the speakers, but the ends in your hand are not connected to anything yet. Plug the black in to COM. Plug the red in to 16 Ohm.

The sound from the speakers won't be stereo. It will be mono because that's all the amp outputs. But both speakers will work so long as they're functioning units.

If you have two 4 Ohm home theater speakers then you can do the same trick. 4 + 4 makes an 8 Ohm load. Connect the red to the 8 Ohm output.

Don't be tempted to try to connect to multiple terminals. The amp isn't powerful enough to to run more that one speaker chain.

Hope this helps

Sep 15, 2014 | Audio Players & Recorders

1 Answer

Looking for service manual for realistic MPA 80 MODEL 32-2026


If it's on both channels the hum could well be produced by the main power supply capacitors. The big ones. Replace all!

Dec 11, 2013 | Audio Players & Recorders

1 Answer

Looking for manual Realistic MPA-40 35W


I have a realistic mpa-40 35 -watt pa amplifier owner's manual
cat, no, 32-2032A
You can conyact me @ ltlerock@aol.com

Jan 03, 2010 | Audio Players & Recorders

1 Answer

Cross wired speakers and blown power transistor. After replacing the blown power transistor, started blowing low power (3A) supply fuses on power up. Where do I look next for problems?


Often when the outputs get shorted, the "driver" circuit gets smoked as well. If you are having the fuse blow, there are additional semiconductors that are defective as well. This unit should be brought in for service. Realistically, this will need about $30 or so in parts. Without experience, this will be a difficult one to repair.

Dan

Jul 08, 2009 | Pioneer A35R 2-Channel Amplifier

2 Answers

Realistic MPA-35 amp by Radio Shack


It's not that this amp isn't like "newer amps" with + and - terminals, it's that this amp is made for public-address system use. This kind of amp is used in a store, for instance, to pump background music through speakers all over the place. The terminals you connect to are determined by total impedance of the speaker configuration used.

Most single speakers, or the two- or three-way cabinets for home stereo systems, are 8 ohms. If you're connecting a single speaker you use the "common" and "8 ohm" terminals on the rear panel. With multiple speakers, you need to figure out the total impedance and use the appropriate terminal. In series, impedances add. Two 8 ohm speakers in series would total 16 ohms, so you use the common and 16 ohm terminals. In parallel, the total impedance drops. Two 8 ohm speakers in parallel total only 4 ohms. You need to figure the total impedance of the speaker configuration and connect accordingly. Too great of a mismatch will damage the amp or speakers or both.

You might be able to find the manual for this amp on Radio Shack's website. Here's a link to the manual for the model MPA-40 which should have similar output terminals. The basic information about figuring out total impedance and general use of PA amps applies to your amp as well.

Jun 16, 2009 | Audio Players & Recorders

1 Answer

Monster MPA 5150SS


Might be a failing semiconductor component (usually an old transistor) in the amplifier's front end. This caused by the oxidation through the component legs or pin. I usually touch and move each transistor's body to exaggerate the noise. You can research also what kind of noise is it producing- intermittent, static, etc.
hope this helps..

Sep 20, 2008 | Monster Cable MPA 5150 SS Amplifier

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