Question about Marantz PM-68 Amplifier

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PM-68 Marantz Receiver keeps shutting off sound after a few

Very frustrating! The receiver (regardless of source and output/types of speakers) continually kick out after a short period of play. It will play wonderfully then "click" off occasionally coming backing on, only to click off again.

I feel like I've tried every permutation of possibilities (from different wall sockets to speakers) to try to nail down this problem...

Purchased this second hand sight unseen from forum for relatively cheap. thinking i got ripped off at this point.

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Hi...

Sounds like there's a power component in the amp section that's outlived its' usefulness.

Unless you have a few years exp in electronics, I'd take it to a tech

It could also be not-so-good solder connections on the protect relays.

I've seen that before as well

Posted on Dec 29, 2008

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Try turning the system on with no speakers hooked up. and see if it clicks off. if it does,the problem may be the a short on the speaker connections.

Posted on Dec 25, 2008

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I wrote this for a different receiver, but if you account for minor differences to your receiver this will work just fine.

There's good news and bad news. The bad news you need a separate amp because a multichannel receiver with Bose 901's attached as recommended for a standard stereo receiver will only sound right in STEREO on stereo analog material. The other speakers around the room are not designed to receive its Active Equalization and if you engage your Tape Monitor you will NOT BE ABLE TO HEAR DIGITAL sources at all. Tape Monitor is for analog stereo material only and on modern AV receivers it disables any digital inputs so you really can't use the Tape Monitor circuit or attached devices for modern digital sources. However, you can still employ the various DSP options to spread 2-channel analog source material around the room. I do.

The good news. I have a setup similar to what you want to do and it works great! With one caveat - My receiver actually has 5.1 analog Outputs so I can drive up to 6 external amplifiers if I want to (I drive 4). IF yours does NOT (*) we have to be creative in extracting the front two channels from your multi-channel receiver. The obvious alternative place would be at one of the few OUTputs on the back, assuming you have one free to use.

* I can't find your exact manual so I have to extrapolate features.

I see on the SR>6003< there are Pre Audio OUTS so I'm betting your receiver does, too.

A separate stereo amp for the 901's was my solution. I run a Carver AV-406 (5-channel amp) for my 901's in Front, 2 Subwoofers and the Rear Surround channel, with the Active EQ between the receiver Front L&R Outputs and the 901's amp channels. My receiver controls everything and just drives the Center and Surround speakers.

You could get by with just a stereo amp for the 901's. A Carver M-200 is a good efficient amplifier that would have you cooking just fine (2x100W). Run it with the Active EQ between the receiver Front L&R Pre-Outputs ** and the 901's amp channels.

** Front Pre Out; (or VCR or Tape Out if you don't have Pre Outs) >>> Bose EQ Amplifer IN, then
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