Question about Myryad M Series MDP 500 7.1-Channel Amplifier

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Pre-amp locks up

After 10 to 20 minutes of operation the pre-amp locks up, usually with a "Myrtad MDP500 Powering-up" message. At tjis point the powerr button does nothing. The only way to get around the problem is to unplug the unit. I suspect a micro-processor problem. Is their a US repair service that anyone knows of? Is a schematic available. I have not received any response from my e-mail communications to Myryad.

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Re: Pre-amp locks up

Check the repair dirctory at the bottom of this site

Posted on Dec 01, 2007

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Preamp is not working,a main component has failed,do not know which component but do know that it is in the pre amp,will not turn on or power the other 2 amps

If you have lost both channels then it's something that is common to both that has gone. If one channel has gone, use the good channel as a guide. Here's what to do find the point where the pre-amp outputs to the power amp. With a screwdriver touch that point (make certain you only touch one metal point at a time = don't short anything). It should buzz! work backwards till the buzzing stops. It is easier to test with a channel working, but I think you will soon get to the faulty stage.
PS IC's are allways suspect when both channels out!
PPS Don't touch any power parts with the screwdriver!

Jan 08, 2010 | Amplifiers & Preamps

1 Answer

I don't know where to connect the main in & pre amp jacks??? to the EQ???

Not sure I understand your question, but I will try.
Your CD players, tape decks, etc., connect to the INPUTS on the preamp.

The LINE OUT on the PRE AMP connects to the LINE IN on the POWER AMP.
The pre-amp does some amplification and then it passes the signal along to the power amp, which will do the heavy lifting - driving the speakers.
The connection is usually through a shielded RCA plug cable. THere will be 2 cables from the Pre amp to the power amp - one for the left channel and one for the right channel.
The OUTPUT Of the power amp will connect to the speakers using large, stranded wire cables, sometimes with "banana" plugs that simply plug into the terminals on the power amp and the speaker.
Let me know if this gets your started.

Sep 28, 2009 | Amplifiers & Preamps

1 Answer

Right channel cuts out,usually after listening to music loud.Usually happens when amp is warm

Most likely a loose connection/dry joint inside

Check all exterior connections first.

If amp has pre out power in connections the try driving another amp from pre out stage.
Try driving power in stage from another source.
Swap round inputs to check preamp section
Always start at low volume, check sound is ok at low the make it loud.

Write down results of all tests, it will save time and money at the repair shop

Sep 24, 2009 | Amplifiers & Preamps

1 Answer

Difference between audio amplifier & OPAMP

An audio amplifier is a general term that applies to any amplifier specifically designed to cover the audio spectrum, and usually referres to power amplifiers (of any power from micro headphone amps (like the headphone audio amplifier circuit in an ipod) . to power amps like the ones used at rock concerts that are several thousand watts).

An OP-AMP is an Operational Amplifier, which refers to a type of amplifier circuit. Op-Amps can amplify audio, but are not restricted to it. They are used in many things from audio circuitry to signal conditioning, and sensing from all kinds of equipment from seismometers, to light sensors, temp sensors, insturmentation amps, lab amps... RF amps etc...

There are many many different types of op-amps that are designed for many different applications. Mostly the parameters are frequency response, gain, and input/output impedance.

Op-amps usually come in an IC package of some sort. The most common are 8 pin DIP package types.

Op-amps do NOT handle power. (although there are some hybrid power op-amps available, they are specialty devices) The term op-amp refers to the ability of the amplifier to be manipulated mathematically by external values. (i.e. resistors set up to add, subtract, or multiply the value of the input signal) Hence the term OPERATIONAL amp, because it is performing mathematical operations on the signal. (They were first used in analog computers, allowing the voltages to be added, subtracted, and such, and displaying the resultt by directly reading the voltage value).

They handle only small signals, and require being followed by a POWER amp to do anything useful, such as drive a spleaker, or a relay, or a transducer.

For your question, most all audio amps consist of stages.

There is an input/pre-amp stage (this is usually where the eqalization, signal processing, and bass/trebel tone controls are implelented) and a power amp (output) stage that takes the signal fromthe pre-amp and raises the voltage and current to a sufficient level to drive speaker.

The input/pre-amp stage is most usually composed of a series of op-amps. Op amps also are responsible for the bass/trebel control, and the EQ.

There will most usually always be several Op-Amps in every Audio Amp.

Jun 12, 2009 | Amplifiers & Preamps

1 Answer

Avalon 737 Pre Amp Repair (New York City)

If you are not looking for a warranty repair, any shop that handles high end audio repairs should be able to resolve this for you. Before you ship off the pre-amp, verify that it is, in fact, the pre-amp that is defective. The initial stage of the power amp can cause this as well. Try hooking up another pre-amp instead to verify the problem location.

Keep us posted,

Apr 16, 2009 | Amplifiers & Preamps

1 Answer

Cant figure how to hook my stereo up

what to remember is pre-amp is before the amplifier then the amplifier to the speakers, go this route, Tuner for radio? from the radio tuner out go to the pre-amp tuner input, then from the pre-amp OUT go to the AMPLIFIER IN, tuner, cd, dvd, tv, any source, if you are using a 2 channel amp and pre-amp this is relatively easy, a little more detailed for multi-channel pre-amps and amps but follow the same path, sound source signal ie. tuner to pre-amp, pre-amp out to amplifier and speaker hookup to amp channels,

Jan 29, 2009 | Amplifiers & Preamps

1 Answer

My old yamaha wont stop buzzing


Aug 17, 2008 | Amplifiers & Preamps

1 Answer

Pre Amp Set up

Get the right cables and plug them in. Pre-amp to mixer to amp. Radio Shack is a good place to buy the wires with proper ends on them.

Jul 22, 2008 | Amplifiers & Preamps

1 Answer

P-301 onkyo pre-amp

Hi juicer, If you use the switched outlet, then everything will be turned on/off when you operate the preamp power switch. Use the unswitched, then you have to turn off each unit separately. You choose which one you want. It wont matter.

What connection do you intend to use to connect the LBT zx6 to the Onkyo preamp??

Mar 20, 2008 | Amplifiers & Preamps

1 Answer

Denon 3300 Fan Workaround?

the preamp section will not generate a great deal of heat. Try it and see...leave the amp running with signal going through it and the prein-out jumpers removed and see what noises it makes over time

Nov 22, 2007 | Amplifiers & Preamps

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