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I have Marantz tuner & preamp AC500 conected to 5 amplifiers and speakers in 13 rooms. System was working great for 12 years. Now, I have to reduce the volume on Marantz preamp, from 12 to 9 to avoid amplifiers clicking (going to prevent mode). Am I correct that preamp output changed for some reason so that I can't play as loud as before?? Do preamp deritoriate with time?? What should I do??

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Hi Andrew49

If all the amps are going into protection mode, then the preamp may be pushing a DC component with the signal. This is a little serious,and should be investigated further. There may be some deterioration in the electronics of the preamp causing this. I would suspect a leaky transistor or bypass/coupling capacitor in the DC coupled output stages. should not be too hard fix for a good HiFi tech.

I am more than happy to answer any other questions you may have about it, please get back to me here, or use the ASK function to go straight to me :) If you are still unsure, have problems, or we need to look at the situation more deeply, then before you give a rating for this advice, hit the ASK button Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek

Posted on Jul 13, 2008

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Hi spanky

Sorry for the delays in getting back to you. Been busy here this week.

OK. to connect the 2275 to the 1152,there are 2 ways of going about this.

You can plug the pre- out of the 2275 to the power amp-in of the 1152. In doing this you are using the power amp section of the 1152 and the preamp functions of the 2275. Your other gear like CD player, tape deck and so on also plug into the 2275.

the other(better) way is to plug the pre-out of the 2275 into the tuner inputs of the 1152, leaving the volume at about 40% on the 2275 and use the 1152 as an integrated amp. This means you are using the 2275 as a tuner only. When you do this, you will need to use an RCA lead to jumper the pre-out/poweramp-in connections on the back of the 1152, and the 2275 ... L to L and R to R respectively.

I am still wondering why you want to use 2 integrated amps (each having a preamp and a poweramp section) The only real benefit the 2275 brings to your system will be tuner functions. You could just get a tuner and run the 1152 to be an ideal rig.

Let me know what your ideal setup you are wishing to build would have. Speakers, other gear like CD, tape deck, etc.

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Hi spanky

Where to start :) I am excited thinking about them :p You got 2 totally cool pieces of classic vintage gear there in the C2 and the Marantz. I have a C2 preamp myself (gathering dust but wont sell it cos its excellent) and the marantz would be totally cool to have(but then I am a little biased towards 70's vintage marantz). They ruled the roost in HiFi amps throughout that decade.

Because they are both integrated amps, you could use them as standalone systems with a pair of speakers, and just plug your favourite gear into them. If you just wanted to run up a nice sounding HiFi, I would sell the kenwood gear and just keep the Marantz. The Kenwood kr1100 has the edge in power, so if it is grunt you are looking for use that. Because vintage sound is all about stereo, you only really need an integrated amp to get great results.

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The marantz is a little lower in power at 75rms a channel, but will have the sonic edge in vintage sound over the kr1100. Look them up on ebay and you will find that they do have some value to collectors and people seeking nice tone. There is an 1152 for sale here for AU$900

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You could also run both amps from the C2 preamp by connecting to the Amp in connections to the rear of the integrated amps.

happy to talk to you more about it, hit me with a Fixya if my advice was helpful to you. I would keep the marantz, use that and sell the rest and buy some nice speakers:)

regards
robotek

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Hi

Sorry for the delay in getting back to you, you have an odd problem happening there, the pre-amp being the common denominator to the syptoms. Perhaps you could try reducing the attenuators to say 60% and retry at the same levels you used to use at the preamp. It is unlikely that there is a fault occurring that would increase the output of the preamp, more likely to be a DC component getting through. It could also be possible that the amps if all the same make and model have through over the period of installation developed the same fault.
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