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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I plugged in a 4.5 vdc adapter to the midi & speaker outlet on my Wurlitzer c300, and now the organ won't play. Did I blow something?


speaker outputs should NEVER be subjected to DC voltages, chances are that you've blown the output transistors.
your options are limited, if you're lucky it'll have a separate low-level amplifier to the headphone jack (if it has one) you could use as an AUX output to an external amplifier.... or take it apart and find the output transistors to reference and replace, or bypass those altogether with a Class-D amplifier.... dependent on your level of tinkering skills of course.

Sep 04, 2017 | Wurlitzer Audio Players & Recorders

1 Answer

I have a 2010 cobalt lt. Today both my feont speakers quit working. And now my turn signals make no noise. Or the door chime or the seatbelt indicator does not work. What causes this and how do I fix it?...


The chimes an turn signal noise come out driver door speaker . Both front speakers not working could be a blown circuit fuse inside the radio or just blown front speaker channel . Your best bet , take it to a GM dealer or someother qualified repair shop . You have no idea of the complexity of this . The radio can set DTC'S - diagnostic trouble codes , believe it or not !
DTC B1025, B1035, B1045, or B1055
DTC B1025 01: Audio Output 1 Left Front Circuit Short to Battery
DTC B1025 02: Audio Output 1 Left Front Circuit Short to Ground
DTC B1035 01: Audio Output 2 Right Front Circuit Short to Battery
DTC B1035 02: Audio Output 2 Right Front Circuit Short to Ground
DTC B1045 01: Audio Output 3 Left Rear Circuit Short to Battery
DTC B1045 02: Audio Output 3 Left Rear Circuit Short to Ground
DTC B1055 01: Audio Output 4 Right Rear Circuit Short to Battery
DTC B1055 02: Audio Output 4 Right Rear Circuit Short to Ground

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is one half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3V AC and slightly higher.
DTC B1287 01: Amplifier Control Signal Circuit Short to Battery
DTC B1287 02: Amplifier Control Signal Circuit Short to Ground
DTC B1287 04: Amplifier Control Signal Circuit Open

The radio provides a remote amplifier mute output circuit to control overall muting of the remote amplifier. The amplifier receives pulse width modulated (PWM) signals on the control circuit at varying duty cycle percentages for controlling muted and unmuted functions of the amplifier. Circuitry internal to the radio monitors the remote amplifier mute circuit for faults and sets the appropriate DTC when faults are detected.

Feb 16, 2018 | 2010 Chevrolet Cobalt

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...

1 Answer

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

1 Answer

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

1 Answer

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

1 Answer

Speaker output very high


You can't control it with the balance control?

Dec 03, 2017 | AMC Multimedia 3050a 2-Channel Amplifier

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