The usual method is to use microphones to get the sounds from the amps to the mixer, and so the signals still come out of the amps while they also go to the mixer.
If you run direct, the usual method is to use a DI box with a "thru" jack, which send the signal to both the mixer and amp.
Nobody is going to warranty that, cause it's not broken, unless you happen to run across a very sympathetic service person. Even then, don't count on finding anything quiet. Laptop power supplies just suck for noise, and really until the problem starts to affect the mainstream buyer computer...
As far as the phono pre- all phono pres have what is called RIAA eq built in. It's a very steep treble roll-off. It's not going to be good for recording.
Happens a lot with laptop power supplies. Sometimes it can be cured by using a grounded (3-prong) adapter...sometimes batteries are the only way to go.
Those GLS cables are ok, but homeslice has some reading up on products to do:
"Neutrik Speakon Connectors are the wave of the future. They lock in place and have 10x the current capability of standard 1/4" plugs and jacks."
:p
A friend of mine showed me a slick trick for ICs. He worked in a Russian aerospace factory. They used stainless steel veterinary syringes. You find the one that fits in the hole, melt the solder, and poke the syringe in the hole. The leg of the IC goes into the syringe. When the solder cools...
If it's for immediate sale, like right after the show, set up a mix just for recording and go straight to two track. You'll never have time to mix down a multitrack before the audience is long gone. Get a multiple disc burner and start pumping out the discs.
The phase inverter is going to be the one closest to the power tubes.
That one is closest to the input jack, it's going to be the first gain stage. It has the cap on to give a little protection against noise, since the first stage with the low-level guitar signal is the most vulnerable..:)
And every Fender, Marshall, most Mesa Boogies, most boutique tube amps...all passive, cut-only eq sections.....if you have all the eq knobs up to 10, it really means you are just cutting as little as possible...
The tubes are also for make-up gain, the passive section has lots of insertion loss. As far as the boosting, the unit has a fair amount of reduction when the controls are set flat- so it's not boosting, really, it just cuts less when the controls are in the boost range. That's the way lots of...