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Hello - help request from new member


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Hello,

 

I have acquired some audio equipment from my grandfather, and looking some assistance in setting it all up correctly.  The stereo is comprised of:

 

1. NAD stereo receiver 7240PE Power Envelope;

2. NAD stereo tuner 3400 (I don't really intend to use this, but have set it up to test it);

3. NAD CD player 5240;

4. ADCOM GFA-555 power amplifier (I don't really know what this does to be honest).

5. Audiogramme AG36 speakers x  2

 

I've assembled and plugged in everything as pictured below, but I can't get any signal from the CD player.  All units are powered and appear to be working but no audio is playing through the speakers.

 

I am very unsure about how I need to connect my speakers to the reciever and the power amplifier, and what settings I need to use, especially the "main in" / "pre out" lines on the back of the receiver.

 

I also would like to know how I can plug in an auxiliary cord into the stereo reciever in order to play music via a tablet or smartphone, I've attempted to plug an RCA cable into the 'phono' port on the back, but I understand that this is typically used for a record player input.  What's the best way of setting this up?

 

Thanks!

 

 

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Nice vintage score!

 

So you wanna hook the pre out on the reciever to the power amp and connect your speakers to the power amp.

 

If you don't want to use the power amp,  I'm pretty sure you just link the pre in and main out on the receiver and connect your speakers to the receiver.

 

Phono is only for turntables, you may have to you the cd inputs to use you phone. 

 

Make sure you turn off the system before unplugging or plugging anything in.

 

Edited by Bcdesign
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Hi Ben,

Two options.

 

1. you have your speakers connected to the NAD stereo receiver 7240PE so to make that work you need to connect a RCA lead from

"pre Out" sockets to "main in" sockets.

That will link the internal preamp section to the power amp section in the NAD receiver & the you should get sound.

 

2. If you want to use the Adcom Power amp 

Connect the speaker wires to the output terminals on the Adcom amp.

Connect the "pre out" sockets On receiver)  to Rh & Lch inputs on the Adcom power Amp

 

Either way will work

 

Sorry duplicate answer Bcdesign beat me to it

Edited by Gieseler Audio
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OK - great!  So I've done this:

 

Connect the speaker wires to the output terminals on the Adcom amp.

Connect the "pre out" sockets On receiver)  to Rh & Lch inputs on the Adcom power Amp

 

And I'm getting audio through the CD channel, but it's almost imperceptibly quiet, so I'm going to check the speaker connections.

 

I've setup the speaker wire with bananna plugs, but I'm not sure if they're correctly configured (pictures below).  The output terminals at the back of the Adcom amp have a terminal with a screw, so I've loosened that fully off, inserted the speaker plugs and then tightened them back up - but not sure if this is right!  Any adivce?

 

Thanks again :)

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RE very low volume

On the NAD receiver make sure the "tape monitor" button is not in.

 

With the banana plugs just a bit less wire poking through so the thread is not fouled & then you can screw the rear thumb nut in further

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Is the source switch set to match the input that the CD player is connected to? Your description sounds like it may not be.

 

With the CD playing, try also turning the bass and treble dials as they can be a little dodgy after not being used for a while. Keep the volume control at around 1/4 while doing this. Also press/turn a few of the other controls as well as any of them may be in a similar way.

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And some clarification on the colours of the cables, if you are unsure:

  • For the RCA interconnect cables (the ones used between the amp and CD/tuner), red=right channel, white (or black) = left channel.
  • Speaker wire - the wire with the stripe is generally used for the -ve signal, the other without a stripe is for the +ve signal. 
  • Speaker connectors - red=+ve signal, black (or white) = -ve signal.
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Confirmed I have checked the following:

 

1) Tape monitor button is not on;

2)  Source is set to CD;

3) Correct cables into appropriate plug;

4) Have tried changing the bass / treble and hitting some of the other buttons during play;

 

Still getting very quiet audio.

 

I have also tried this:

 

1. you have your speakers connected to the NAD stereo receiver 7240PE so to make that work you need to connect a RCA lead from

"pre Out" sockets to "main in" sockets.

That will link the internal preamp section to the power amp section in the NAD receiver & the you should get sound.

 

And getting the same issue!  This makes me think the problem is with the receiver, as it is not even plugged into the power amp.

 

I will try and use another set of speaker wires - any other ideas of things to try?

 

Thanks 

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The CD player seems to have variable outputs. If you're able to control the volume (is there a remote?) you could try to plug the CD player directly into the Adcom.

 

But it could be VERY loud if the vol control isn't working

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HI Grizzly, 

 

It appears so - though I'm not sure I've got the tuner plugged in correctly.  There's no "Tuner" input on the back of the reciever, I've plugged it into the "main in" input.    Not sure if I haven't got the tuner plugged in correctly, or I'm just not tuning it in correctly to pick up a radio station.  Where should I plug it in to test?

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18 minutes ago, Sirloinchop said:

HI Grizzly, 

 

It appears so - though I'm not sure I've got the tuner plugged in correctly.  There's no "Tuner" input on the back of the reciever, I've plugged it into the "main in" input.    Not sure if I haven't got the tuner plugged in correctly, or I'm just not tuning it in correctly to pick up a radio station.  Where should I plug it in to test?

 

As it has an inbuilt tuner there wouldn't be a "tuner" input. However this can be connected to either the CD or Video input without issue. 

 

Warning- any component plugged into the "Main in" will send a full blast signal to your speakers (if connected) as the volume control is bypassed here. This should generally only be connected to a "pre out"

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17 hours ago, sakabatou said:

The CD player seems to have variable outputs. If you're able to control the volume (is there a remote?) you could try to plug the CD player directly into the Adcom.

 

But it could be VERY loud if the vol control isn't working

Yes, I've tried both the fixed and variable outputs.  There is a remote (pictured below).

 

Where would I plug the CD player straight into the power amp?  It would have to be the Right Channel / Left Channel inputs at the top.

 

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2 minutes ago, Sirloinchop said:

Yes, I've tried both the fixed and variable outputs.  There is a remote (pictured below).

 

Where would I plug the CD player straight into the power amp?  It would have to be the Right Channel / Left Channel inputs at the top.

 

Correct. Use the variable out put from the CD into the top inputs of the power amp. But make sure you have the volume turned right down, then inch it up slowly

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It's possible that the volume on the CD player itself is already all the way down, giving virtually no signal. While connected to the NAD receiver CD inputs and playing, increase the volume of the CD player via remote and see if anything changes. Keep the volume on the NAD at around 9 oclock for this procedure.

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1 hour ago, Grizzly said:

It's possible that the volume on the CD player itself is already all the way down, giving virtually no signal. While connected to the NAD receiver CD inputs and playing, increase the volume of the CD player via remote and see if anything changes. Keep the volume on the NAD at around 9 oclock for this procedure.

Good suggestion!  I've tested the remote, batteries are fresh and the receiver is pinging with a green light in the "remote panel" whenever I sent a signal from the remote, the audio via the remote is on max but unfortunately this hasn't increased the volume beyond what it was previously operating at - very quiet still.

 

I notice that when I turn the volume knob to max, there are lots of 'pops' and 'crackling' coming from both speakers.

 

I have also tested the built in tuner on the stereo receiver and cycled through some of the radio presets - same issue again, very quiet.

 

After doing a bit of other research - is it possible that I need a "Pre-Amp"?  Or by virtue that my stereo receiver has a "Pre-Out" this means it's performing the function of a Pre-amp?   I do have another Yamaha receiver in the house that I can try and swap in to see if this solves the problem, but I was really hoping to get this one up and running.  Any other ideas?

 

PS I have also swapped out the audiogramme speakers with another set of yamaha speakers, and this did not solve the problem.  I have also used an alternative set of speaker wires, which also did not solve the issue.

 

 

Thanks.

 

 

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So this all points to the receiver being the culprit here. It functions as an integrated amp meaning the preamp and power amp are built into the same chassis. With the pre out and main in connectors it can be used for either of those purposes separately. 

 

If you try what sakabatou said, connecting the variable outputs of the cd player to the "main in" on the receiver, with the volume at minimum, you could slowly bring the volume up while playing a disc. This will show you whether it is the pre section or power section of the receiver which is at fault. Either way though, it will need professional attention unfortunately.

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