Tape Monitor Line-Out direct to amplifier solution

I was running a CD player directly into the Placette remote volume control (RVC) which was connected to my amplifier. I could not listen to my LP turntable this way, so I connected the tape-out from the preamp to the line-in of the RVC and left the line-out of the RVC connected to the amplifier. The main output of the preamp is not connected to anything.
To listen, I select from the pre-amp but leave its volume control off. I control volume using the RVC and find that the CD player requires a little less volume than my high-out MC cartridge to get the same levels.
The CD player and LP turntable produce a cleaner sound this way than by running them through the preamp main output. I suspect that the signal isn't going through the entire pre-amp and is less affected by this.

Sean, he wants to run the tape out full strength and pad the output of the amp. In this case I agree with Audioak, there is a danger of clipping the amp, overheating it, and a lot of wasted power into the pad.

Better to add a passive between the pre and power amp.

Wow. Thanks for pointing that out / clarifying the situation Herman. I guess i didn't catch that Audiok was hinting at the same thing. I somehow overlooked that in the original post, probably because i wasn't ever expecting to see something like that. I jumped to conclusions thinking that the attenuator would be used like a "passive preamp" to attenuate the volume between the source and the amp, not between the amp and speakers. While such an approach is used for guitar work ( Tom Scholz' Power Soak ) in order to create massive sustain, distortion and overdrive due to severe clipping of the amp, you definitely would not want to do this with a home audio system.

Good catch guys and thanks for covering for my lack of attention. Both I, and especially Andron, owe you one : ) Sean
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Another option is to switch to an preamp that has dual main outs. I did this recently in an attempt to run two pair of speakers as a "super-speaker" (for lack of better term). If you check my threads, I asked which preamps have dual main outs.
Interestingly, I ended up going with none of the great suggestions given me. I saw a Rogue Magnum 66 for sale; the owner told me that the tape out is internally switchable to a second line level out! It was, and I'm using it as such.

Another possibility (you may want to discuss with someone who knows more of the technical aspects) is to split the signal using an Audioquest RCA "y" adapter. They're only $25 per pair, and might do the trick. Lot's cheaper than second preamp!