Question about Rotel Audio Players & Recorders

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I have a rotel rb970bx. I have 2 and ran them in mono driving a speaker each. I tried to biamp the speakers with one amp driving the tweeters and one the woofers. This worked for about 4 minutes at 1/4 volume on the preamp when one amp went dead. Inside the right channel keeps blowing both fuses when I power up?

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  • Expert
  • 111 Answers

Hi
it sound to me that when you biamp and driving speaker and woofer , you are over loading the fuses , suggestions
uprate the fuses till they stop blowing

Posted on Dec 21, 2017

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Posted on Jan 02, 2017

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Duncan
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SOURCE: Rotel RA 9808X Amplifier

I'd suspect that one of the two output transistors on that channel has gone bad. If you are unsure how to test or troubleshoot this, then you might try replace both the NPN and PNP outputs and catch the bad one that way. If your amp uses an output module then you would of course have to replace the module which would replace all the output transistors on both channels. Good luck. Another thing to look out for, is the emitter bias resistors. They are the large white ceramic ones near the outputs. Sometimes one of those will open up too. They will be of a very small resistance value like .5 ohms (point five ohms) or something in that general ballpark, and have a wattage value of typicaly 5 watts. So they are pretty big resistors. Be sure to check them all even if you do find a bad output transistor. They will often go out with the transistor. Good luck.

Posted on Jan 18, 2007

dunnbiker
  • 8546 Answers

SOURCE: Rotel processor bypass for Audio Research SP10

If I understand you, the 'sound' of the AR preamp is what you're trying to preserve. Presumably you're just running a phono through it as nothing else needs a preamp these days.

The multichannel inputs bypass all of the Rotel's processing except the volume. Use the Front L and R.

Posted on Mar 12, 2010

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