Need system selector to compare various systems

[Couldbfishin]

I have 3-4 systems set up in my audio room (extra bed room converted to my man cave). I have some set up to play LPs and record to RTR and Cassette tape. I have one set up to play jazz 78's and record them on CD or tape. I have a couple of B&O 5500 Beo Systems that I just like to listen to. And, I usually have a system with components I am working on.
I have a speaker selector box and a couple of different sets of speakers set up.
What I need is a selector box that I can run from the amps of different systems and instead of going directly to speakers, the signal would go into the selector box. It would keep me from having to rewire components to listen to and compare the various systems.
I have seen these set ups in audio stores over the years, so listeners can compare different receivers, and different speakers.
I have searched the net, and looked through this site, but have not found anything suitable. Can anyone tell me where I can find a ready made selector like this, or where I can get a schematic drawing to build one from scratch? Prefer the ready made.
It would be ideal if it had a control and digital readout or meter to read and adjust the signal for better comparison of one system over another.
I am not an expert in this area, so please excuse the terminology. I am a novice who enjoys tinkering with vintage audio gear.
Anyway, TMI, let me know please if you can help me with a source selector for amplifiers/receivers.
Thanks,

 

[62vauxhall]

What you're describing is within the realm of possibility but outside the realm of practicality.

Switchers like that have been employed in audio store sound rooms, when such things existed, but they are failure prone.

Not long ago I experimented building a phono switcher with inputs for 7 turntables and all I got was a whole lot of hum.

I spent a good number of years selling audio and was quite familiar with those sound room selector boxes. Ideally one could demo any amplifier with any speaker at the push of two buttons. As mentioned, they fail.

Twice, in different sound rooms, I constructed patch bays.

That method worked well enough as far as I was concerned but other sales people had trouble figuring out how to "work it". Or they were lazy and perhaps not very bright.

Doing what you describe is possible but not worth the expense or time. The end does not justify the means.

 

[Couldbfishin]

Thanks 62vauxhall, I appreciate the response from someone who actually used the switchers in audio store listening rooms.

I have given up on the idea of the switcher.

Now I am limiting the number of systems to 2-3, each with a different pair of speakers. I won't be able to compare them directly, but it will suit the intentions of each. For example: one for 78's; one for recording LPs and playing back on RTR, cassette, CD and eventually maybe memory sticks; and one for just listening to older LPs.

I know I could do this with different turntables/cartridges, but I want to dedicate my old McIntosh equipment and a Dual turntable to play and record jazz 78's (from the 20's and 30's). And I will change out styli on a Shure 91ED cartridge depending on the condition of the 78 and the stylus width and tracking force required. The C20 preamp (1958) has equalization settings for the different record labels before standardization. I intend to use KLH model 5's as soon as I finish the cross overs.

I just ordered a Lounge Audio Copla (SUT) and Mk III (phono preamp) that I will set up with new Denon 301 Mk II LOMC cartridge on a rebuilt Denon DP-45F TT and using a rebuilt Marantz receiver for playing my better vinyl, and recording primarily on RTR. I have always enjoyed listening to RTRs. I have my original Pioneer RT-1020L from the late 70's, and a more recent purchase, a Technics RT-1200 US (late 80's I think). I am setting up KLH model 6's for this system, which I rebuilt and refinished.

I will play my older vinyl on a B&O Beo System 5500 with a MMC 3 cartridge using KLH 21 speakers (4 ohm).

So most of what you see in the attached photo has been moved around or changed out for the things I have mentioned.

You can see I like older equipment, probably because I am older, and it is what I am familiar with. I don't now a thing about new gear. And, I find it easier to change tubes than to work on PCBs.

Thanks again.