RG's humless ABY a simpler use?

[m_charles]

Been poking away at this one (getting info, parts etc.) for months now. Something dawned on me tonight that I wanted to get some info about.
My use for this pedal is simply to be able to run 2 amps in a "proper" way, not having to take the cheaper/dangerous route of lifting a ground on one amp with a little gray ground lift adapter to avoid hum.
I want to only split my signal with my delay (a boss DD-2) and run both amps all the time.
Now taking this into consideration (my simple use as opposed to needing the ABY function), couldn't I build a little box with 1/2 of rg's circuit (say a TLO71 or just 1/2 of a 72) and one transformer? Put that box in the chain/line to the second amp AFTER the signal is split with the delay thus isolating one output and "poof" problem solved?
I'm pretty sure this is all good from what I've learned around here, but with the safety issue, and saving wasted time, I'd love if someone could confirm or deny this for me.
Thanks as always!
chuck

[m_charles]

bump..anyone???

[trixdropd]

That seems reasonable to me. From my experience, if I were use two amps, I'd only want one transformer anyways, and the other hardwired to ground. The 5 amp splitter I'm currently (slowly) building will use 4 transformers. I have the pcb built and populated but not soldered yet.

[m_charles]

thanks for the reply trix. Guess I'll just have to give it a try since know-one has chimed in to say it wouldn't work. Maybe RG'll take a peek at this post and let me know if I'm on the right track.
I gotta ask you... Are you really going to run five amps live, or is this for studio work?
Can't imagine what a pain in the a%$ trying to rig up 5 amps at a show would be, unless you had someone to do it for you!
chuck

[morcey2]

I've built 2 of them, and if one of the outputs isn't wired to a ground of some sort, the guitar isn't grounded and picks up all sorts of cool noises.  On my last build, I added a ground switch to both of the output and a polarity switch to one of them.  I then hard-wired the ground on the 'A' output and removed it from the 'B'.  I've only used the polarity switch once, and that was just messing around with different sounds.

Matt

[m_charles]

Still wondering on this one. Went over rg's amp splitter schem. again. Do both outs really need to be isolated? Not cool with just one?
Mainly wondering if short-cutting will compromise my personal safety or my amps... Again got spoiled with rg's usual explanations of his project.

[aziltz]

you are correct.  if you already have a stereo split, you can just build half of the ABY (using the transformer) and simply use it to isolate one amp's ground from the other, while feeding them different signals.

[trixdropd]

you are correct.  if you already have a stereo split, you can just build half of the ABY (using the transformer) and simply use it to isolate one amp's ground from the other, while feeding them different signals.

exactly. If you have only two outputs and they are both isolated, it won't be quiet at all. There has to be an unisolated output. Do it after the 1st buffer.