Can someone offer an explanation?

I have a CD player with two Y rca cables splitting the signal and feeding amp A and amp B. When both amps are playing everything works as it should.

When I turn amp A on without amp B I get no audible signal from the CDP. But when I turn amp B on briefly I can switch it off and amp A then gets a good signal from the player and sounds fine.

That is the oddest thing I've ever heard. It could be there is some kind of severe loading or muting going on with either the CDP output or amp B's input. It may help to know the brand of CDP and amps.

There is nothing wrong with either amp or CDP. My hunch is that the CDP's split signal offers too little output impedance for one amp but enough for the other. Once amp B picks up the signal then amp A sees the signal and joins in. I don't know, maybe it's like priming a pump :-)

That does not make sense. If output impedance is too low, nothing other than an active buffer or transformer is is going to correct that. One amp is not going to "see the signal and join in." It may be that amp B actually is presenting a very low impedance when off. When you turn the amp on, even momentarily, that impedance is changing. I have also seen amps with muting relays at the input. The issue could revolve around that perhaps. I asked for brands/models so that I could look at schematics if available to see what loads are being presented. However, you already seem to have your hunch.

Hi, I was wondering if I could get some advise on receivers here?

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Originally Posted by rich66

Hi, I was wondering if I could get some advise on receivers here?

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Rich I sent you a private message. If you need help in how to post let me know. Please stop asking questions that are off topic in another's thread.