running three amps at the same time? you need galvanic isolation (transformators) for this. good transformators aren`t cheap (starting at 50.-$/pcs), so i doubt you will find something good and cheap.
i know you looking for 19", but check out lehle`s dual SGoS. http://www.lehle.com/frameset.php?country=de&lang=en
highest quality transformators!
Nah it's just for splitting so I can have DI and amp input, and a third for... whatever, just for blending two amps and a DI or something. I mean I can get by with an a/b/y but I just wanted to see if there was a rackmount version. I just prefer rackmount stuff! Tidier.
Maybe try a buffer pedal. Passive guitar splitting could cause some some tone suck. Buffers convert high impedance to low to drive long cables and usually have isolated split outputs.
Google didn't find me too many, and the guy that made mine when out of business (Axess). I would try this one. Click on Pricing scroll down to Dual Buffer
I got the name from fifth result, after googling a bit more I found this; costs whopping £458.64 for the passive and 589.18 for the active tho. He also does custom jobs, so you could get it as rackmounted too.
Yeah I found all those. Morgan ACoustics is cheap shit, I have a headphone hub of theirs and it's horse shit.
I think I'm just gonna go with a simple Radial Tonebone, and just glue it to my desk