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Hello. Is there the slightest chance that I coud get a copy of a schematic (or any other info) for a Sylvania SCO3M amplifier/speaker unit? It's a mono amp powered by a 12AX7 preamp tube and a pair of 6V6 power tubes, with a tube rectifier and a single RCA input jack, driving a 3'' and a 6'' speaker, all housed in a wedge-shaped wooden cabinet. Thank you. Frank Latini

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6ya6ya
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Posted on Jan 02, 2017

  • 31 Answers

SOURCE: Using a tube pre amp with my CA Azur 640A?

There are many answers to your questions but Ill have a go with the basics...
Audio connections should be matched.... its called Frequency impedance,.... to get a signal along wires or cables (or Fibre) the Impedance of the cables and wires must be matched to the device they are connected to transfer the signal along the cables without distortion...

Manufacturers provide many sockets on the input side of amplifiers and preamplifiers to allow the consumer to connect various devices of different impedance.

They label these inputs like CD, or Tuner, or PHONO etc etc,

That means if you have a CD player it must be plugged into the CD input socket then the impedance will be correct and the sound will transfer along the CD cables correctly, without distortion..same with the Phono input etc...
You will find on the sound output to the speakers terminals are also labelled 4-6ohm, or 8-10ohm, these are the impedance expected for the coil ratings of the speakers them selves and its important to get the correct speakers to the correct out put terminals...

In your case all you have to do is follow these simple rules and all will be well....you say you have a squeeze box well there probably isnt a port labelled squeeze box so you need to experiment and try out each input port for the squeeze box to see what input gives you the correct sound output...Watch the Phono inputs as these are very sensative to input sound levels and must be treated very carefully as they have a double stage of sound amplification and as such you need to have the volume right down when connecting up the Phono inputs then increase the volume carefully after the cable connections are completed.

If you follow these rules then all will be well,,,,there is no difference if the Pre amp or Power amp is valve or transistor or FET or has IC outputs to the speaker the same impedance rules apply..just treat it as a box with input and output terminals and all the impedance will be taken care of for you...if you read the lables...

You need to connect you signal source to the Preamp inputs the out put from the Preamp connects to the power amp input then the power amp output goes to the speakers. this is a basic configuration for sound systems, there are other variations but are outside this discussion.

Cheers From YUBEUT

Posted on Nov 16, 2007

  • 44 Answers

SOURCE: Denon Power AMPLIFIER

Try these links

http://ca.denon.com/ServiceCenterLocator.asp
http://www.fredsoundofmusic.com/denon_audio.html

Hope this helps!
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Posted on Dec 16, 2007

mrwtech
  • 59 Answers

SOURCE: How do I connect a Polkaudio powered subwoofer (psw 125)

Connect a set of stereo RCA cables from the 'Output 2' on the Hafler to the line imputs on the Sub.Turn on the '1+2' output switch on the Hafler and rock out!

Posted on Dec 17, 2008

mrwtech
  • 59 Answers

SOURCE: Need help understanding amplifiers

Take a look at Marantz's ZS5300 6 ch amplifier. that'll give you 3 stereo zones. Good luck!

Posted on Dec 17, 2008

petraman7
  • 1175 Answers

SOURCE: Adcom 7500, Adcom 5400(bi-amp), Marantz AV-9000, Dakiom HA103

Try just the power amp on ..nothing connected
no Dakiom thingy either. It's a matter of elimination. Start at the output device and work back. Keep the Dakiom out of the loop.
If there's hum with just the Adcom..then it's the ADCOM

Posted on Mar 25, 2009

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Hi,
I have few schematics of Rockford Fosgate units, let me know model number of amplifier to see if its schematics exist in my stock or not.
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http://www.overstock.com/Electronics/Coby-DVD765-Home-Theater-System/3981690/product.html

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Chances are very slim- the once-active supplier of schematics, Sam's PhotoFacts could keep up with model numbers and the few brands that once existed but with this flood of models now on the market and the frequent changes and variations of the mostly Asian brands makes the task pretty impossible. Go to the link below and enter the required info to see if you happen to be particularly lucky; if so, play the lottery.
Sam's
I probably have in excess of 2,000 monitor and TV repairs behind me but never had more than a dozen schematics. If you know the technology, you can do without the documentation. Parts pinouts are readily available on line and help tremendously in pinpointing a problem.

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Generally a "protect" mode would be triggered by a shorted output (speaker). I would suggest disconnection all of the speakers to see if the red light goes off.

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Go take a look at www.rodinaudio.com; go to contact info and call PG direct.

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I wrote to KLH and they sent me the schematics for the upper and lower boards. I asked if I could share them, and they gave me permission to post them for use here.

Have fun!


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