Question about Wurlitzer Jukebox 1015 One More Time 100-Disc CD Changer

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I am working on a wurlitzer model 3000 amplifier model 546b the audio is distorted and the voltage seems to be floating on the output transtors when I turn up the volume the power on the outputs drops there are two glass bulbs wired into the output circut on the schematic it says BR by them I have never seen these before and I think they are the cause of my problems what do I replace them with ?

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They are actually lamps used as a current limiter. If that helps.(?) They have low resistance for a fraction of a second.
I can't be more helpful than that but that's what they do. You can get them from Radio Spares and they have a particular name. You could try The Jukebox Man (UK). He is an amp specialist and will at least know what you are referring to.


Dave F.


Posted on Nov 12, 2008

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Posted on Jan 02, 2017

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How many watts per channel in a technical pro rx55uribt 1500w reciever


What is in a Watt.
Although Watt should be a dimension of power (current times Voltage) most manufactures give numbers you can't use. They always speak of maximum power. That number only can be reached in a laboratory and is measured on a clean resistor. They try the lowest resistor (not an impedance) the amplifier can work with, without blowing the end stage.
Then they put a free marge to tell you it should have a musical power of xxxx Watts. The output differs for speakers of 2 ohm, 4 ohm or 8 ohm. But there is not one speaker with an impedance over the whole audio spectrum.
Just read something over audio and power amplifiers.
The output has nothing to do with the quality of the sound. I have heard 15 Watt amplifiers perform hundred times better then some kilowatt amps.
Even if the manufacture says the amp is 1500 w it could be within legal limits and fir the amp is measured and can't deliver 100 watts of real power nobody can do a thing, because the watts could be the musical power. and that is a free invented non measurable measure. I don't even want to start over distortion, because the cheaper amps do produce more distortion, than music. If you use it for a sub woofer that is no problem, because you feel more than you hear.

Sorry for this big story and not saying what the real output is, because nowadays nobody bothers measuring amps like this.
The more serous audio magazines, will put some test about amps, and you should read one or two test to know what I mean about the worth of watts in audio.

Jul 12, 2014 | Audio Players & Recorders

1 Answer

What is the idle current or voltage?


Idle current is a small amount of current that is flowing through the output stage of the amp with no signal applied. If this current is too high, it could lead to the amp overheating and eventual failure. If it is too low, it will cause distortion in your audio output.

Jul 01, 2013 | Kenwood Km-106 Km-206 Amp Instruction...

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Sound distortion with NAD T 514...


You are probably clipping in that midrange. Since the DVD player is fine and CD player is distorting: they are line level outputs, If you are running those through an equalizer- the equalizer should allow you add in a 10db attenuation.

If you are running them straight to the amp, The CD line level output should be about 1.5 volt peak to peak, it may be the line level input of your amp is only 1 volt and the DVD player simply has that level of output so does not clip..

Simply adding into the cable a 0.1 microfarad polyester capacitor for each channel should be enough attenuation to avoid clipping. The midrange is where you hear the most content in large part because that is the range that the human ear is most sensitive to. Which is why that portion clips. The DVD audio is actually recorded to the same specs as CD audio. You can confirm this by playing your CD disk in your DVD player. .

Sep 25, 2012 | Audio Players & Recorders

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With the gain in the middle was runing vibe12" sub in bandpass box it blew the sub in 4 min of using could u please tell me what sub I can use to play loud it has to be 2 x 12" thanks.


There are many sub woofers out there that would be suitable for your amplifier. Just stick to the quality brands such as Elemental Designs, JL Audio, Alpine(type X), MA Audio, RE Audio and there are many more. Make sure the minimum power handling for each sub woofer is 600 WATT RMS. Another thing. The gain control on the amplifier is not a volume. It is there to match the output voltage (V) of your head unit to the input voltage of the amplifier. For example, if your head unit RCA output is (1.2V, 2V, 4V or even 5V) then match that on the amplifiers gain to be the same. The higher the V number is on your head unit, the stronger the signal is that is being sent to the amplifier. For example, If your have a 4V head unit and the gain control on your amplifier is set to 1.2V the you are sending almost 4 times the amount of signal strength to your amplifier. This causes distortion and distortion causes speakers and sub woofers to blow. I hope you understand the concept. IMPORTANT: This is a powerful amplifier, a 4 Gauge or 2 Gauge power cable MUST be used. Less than 4 Gauge, will cause over heating of both the cables and the amplifier. YOU DON'T WANT THAT. If you still have doubts and need more assistance, let me know.
dreamsystems

Feb 13, 2011 | Alpine PDX-M12 Car Amp

1 Answer

I dont get a clear sound even though the picture is clear


First of all take the Audio output from the LINE OUTPUT and connect to an external amplifier. If the sound is still not clear then it is possible that the fault is in the SIF section provided this is the sound distortion from a Tv program/cable program. If this is a DVD or DTH input then the distortion can be from these input units. So please confirm on them.
If the sound does not have distortion then the fault is in the OUTPUT of the audio amplifier in the TV, Possible the output IC or the coupling capacitor are defective.

Jan 21, 2011 | Televison & Video

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The volume is messed up. I can turn my TV up all the way and put my ear next to the speakers and barely hear a faint voice. The TV itself is fine though and its not the DvD I'm using, I've switched it a...


You will probably need instruments (voltmeter, oscilloscope) to track down this problem.

At first I was going to suggest there is a fault in the audio buffer amplifier, but the only way that would be the case is if it is the bias circuitry inside a chip shared by both the left and right sound signals, or a power supply problem. The other possibility is the voltage reference for the Digital-to-Analog Converter (DAC).

How it works: the DAC gets the digital audio information from the DVD data processor. It generates an output voltage that is a fraction of the voltage reference value. For example, suppose the voltage reference is 2.5 Volts, and the audio data for the right channel is a 1 followed by fifteen 0's (half of full scale, which is sixteen 1's). The audio DAC should produce 1.25 Volts on the right channel. The audio DAC is almost certainly a dual channel device, and uses one voltage reference for both. If the voltage reference is putting out a very low voltage because it is bad or overloaded by another part, you would get the symptom you are having.

What to look for: identify the audio buffer amplifier IC (trace the circuit back from the sound output jacks). While a DVD is playing, use an oscilloscope to compare the input waveform with the output. You will probably have to search for and download the datasheet for the amplifier IC so you can see where the left and right input waveforms go in. If they are the same amplitude, or the output is larger than the input, the amplifier is probably OK. If not, check the voltages on the other pins on the chip to make sure they are correct. In particular, look at the voltage on the pin labeled "Vcc" or "Vdd" on the datasheet. It should be the same as one of the voltages printed by the connectors coming from the power supply board (give or take several tenths of a volt). If it isn't you'll need to check the power supply voltage with an oscilloscope to see if you have a bad capacitor. It is common for the first capacitor in a power supply filter to fail while the second one is good. This can produce a low voltage output that may still look like a clean straight line on the scope. However, for an audio amplifier, the result would be a low-amplitude, distorted sound.

If all is well with the audio amp, you will have to find the audio DAC chip. Start by downloading its datasheet and identifying the voltage reference input. Measure the voltage there. If the DAC has an internal voltage reference, look for a pin that provides this voltage externally.

Cautions: the laser in the DVD player can cause permanent eye damage if it is accidentally viewed directly. If the player mechanism does not have a cover built into it, put a sheet of opaque material (e. g., cardboard) over the DVD drive while you work on it. Keep your fingers away from the power supply, especially the high voltage section where the power cord comes in (often outlined on the power circuit board with white or black dashed lines, bridged only by transformers and several small parts). Get an anti-static wristband, put it on and connect the lead to the metal case of the DVD player. This is so any static electricity you build up in your clothing won't destroy parts in the DVD player. The transistors inside the integrated circuits, especially the data processor and DAC, are very delicate, and can be ruined by a discharge too small for a human to feel as a shock.

This is probably a "hobbyist" repair job. It's my understanding that this model is worth under $35, and most professional technicians want a minimum of $50 just to look at it. If you get lucky, you may find another unit of the same model that is no longer reading discs (try your local electronics recycler). You can swap the mechanism or main board with that unit to get one working (observe anti-static precautions with both parts - the laser circuit is also vulnerable to electrostatic discharge).

Dec 05, 2010 | Philips Magnavox DVD Player MWD200F

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Whats the max power of the system


paulcreber19, All audio amplifiers have their outputs measured for power output using a pure sinewave input of 1khz. With the outputs loaded with the appropriate noninductive, noncapacitve, purely resistive load (1% tolerance load resistors), a RMS voltage reading is made just prior to driving the amplifier into distortion or peak clipping of the output waveform. Knowing the RMS voltage and the OHMIC value of the load you will be able to calculate the RMS current (I) and then calculate the power using variations of OHMS LAW to find RMS power output. To calculate the absolute PEAK power (a measurement not used for rating audio amps anymore) you simply multiply the RMS power by 2.828 to arrive at PEAK pwr. So, your question should have been what is the power output per channel @ 1khz sinewave and less than 1% distortion with an 8 ohm, 16 ohm, 32 ohm load applied to the output. I'm pretty sure this is correct. If not, please let me know where I screwed up.
Bye for now. 12fixlouie

Oct 25, 2009 | Sony Audio Players & Recorders

1 Answer

My powered subwoofer has RCA inputs for four jacks. (two front, two rear) My CD head also has four RCA outputs (2 front and 2 rear). Is there some advantage to connecting all of these with patch cables, or...


the advantage is every time you split a pre-amp signal, the voltage, too, divides in half. Your signal (music) is going down the river at 2 volts say, and when it gets to the amplifier, it is split into 4 streams. The signal will be distorted and the amplifier will not work as efficiently. Use the Front AND rear RCAs so your amplifier uses the best possible signal - for the best possible results!

Also, if you are using 4 RCAs you get true stereo FL FR RR RL Instead of L and R

Dec 30, 2008 | Jl Audio 500/1 Car Audio Amplifier

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