Question about Amplifiers & Preamps

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TC 1490 Micro Media Lab Amplifier Repair

I bought this amp through ebay. Needless to say that it doesn't work and it needs repair. Question: 1. Is it worth repairing 2. if not, do you have any recommendation?
I need the amplifier for experimenting with sound editting. Thanks,

Dara Mohtadi

dmohtadi@msn.com

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  • pjl52 Oct 22, 2008

    I have one too. If you find a circuit diagram or can tell me what was the diagnosis on yours, let me know.




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  • 52 Answers

Dara1,

Its worth repairing if it is repairable provided the cost is minimal compared to what u spend buying it.

Siliconchip.

Posted on Apr 29, 2008

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3 Answers

Where do i take my amp for repairs


- SEARCH ENGINES ARE YOUR FRIEND!!! Type your info into a good search engine (Webcrawler is dandy) and check the results.

- You can be sure that you aren't the only person in the world who has had this problem - should be help out there somewhere.

Good Luck :)
R

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1 Answer

Yamaha dsp a1000 won't power up


Your power suply is defective and needs repair.
Or the power amp is shorted will blow inside fuse power line
distribution.

May 15, 2012 | Yamaha DSP-A1000 5-Channel Amplifier

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Hav nad 2100. I dont understand what the lab in post are for?


From what I have found online, Lab-In was a NAD feature that restored the frequencies that were rolled off when turntables were being used.

http://web.295.ca/~peak//audio.html

"NAD belleived at the time that practical PHONO stages and the preamp and power amplifier stages be rolled off at subsonic frequencies to prevent subsonic wow and flutter from Turntables and supersonic frequencies (EMI/RF/Radio) signals from getting into the system in the first place. Their notion was that if your ears cannot physically hear it, then why amplify it. For the PURIST, there were a set of LAB IN amplifier inputs with more extended response called "LAB IN" inputs"

Use them UNLESS you have a turntable source.

Feb 23, 2011 | NAD C325BEE Amplifier

1 Answer

Connecting NAD 2600a amp.


Never connect incompatible connections. Speaker outputs are for speaker inputs. Period.

The various inputs on this or most any amp are for Line Level signal with the exception of anything explicitly labeled "PHONO" as that would be for a non-preamplified turntable ONLY.

From what I have found online, Lab-In was a NAD feature that restored the frequencies that were rolled off when turntables were being used in the (assumed) preamplifier that fed this amp.

http://web.295.ca/~peak//audio.html

"NAD belleived at the time that practical PHONO stages and the preamp and power amplifier stages be rolled off at subsonic frequencies to prevent subsonic wow and flutter from Turntables and supersonic frequencies (EMI/RF/Radio) signals from getting into the system in the first place. Their notion was that if your ears cannot physically hear it, then why amplify it. For the PURIST, there were a set of LAB IN amplifier inputs with more extended response called "LAB IN" inputs"

Use the Lab In's UNLESS you have a turntable source.

Aug 22, 2009 | NAD 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

Hi there..any idea where I can find circuit/component/diagram for E&W HS3600 amplifier.looks like NZ factory of origin does not exist anymore as e-mail does not get delivered..here is my e-mail to them...


Hi...

From a websearch is seems E&W is in S. Korea

http://www.audiopile.net/products/Amplifiers/HS_Series/HS_series_amplifiers.asp

Maybe they can assist

Dec 30, 2008 | Amplifiers & Preamps

2 Answers

Fosgate fap t1


Hi dougthebug

Where abouts in the world are you so that we can work out a solution for you. :)

regards
robotek

Jul 05, 2008 | Rockford Fosgate FAP T1 Amplifier

1 Answer

TC 1490 Pre-Amp


Depends on the problem

May 04, 2008 | Amplifiers & Preamps

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