Yeah, that schematic is shown with the relay coil in the Lead channel/mode state. Steve Grindrod came up with a quite interesting and very cool circuit with the Jubilee. He is getting a somewhat channel switching function using the same 12AX7 assignments. It uses the same tone stack, that is why I always just consider it modes. The 2205/2210 is a true channel switcher in the sense I think of them. I have been considering for many years now, on taking my hand wired 2555 Clone and doing something extra with it lol. I already have a switchable "Extra Gear" in it that I came up with. I will not elaborate on that any more as it still needs tweaking and refinement lol. A gimmick you could say, that I dreamed would bring me fame and fortune. Yeah, right. Anyways, I am considering adding a separate gain control for the Rhythm channel. It has been done before and there is a web page out there somewhere on it. It just adds in the extra gain pot via a relay coil. But then, it does alter or load down the Lead channel very slightly. Being I have this hand wired Clone besides my '87 Silver 2555 & '89 Black 2550 to compare to, I have considered doing something very cool with the 2555 Clone. Either separating/isolating the two modes/channels and making the Rhythm channel more Plexi'ish. Or making a dual Lead channel setup. Only bummer is my chassis is a small box/short chassis. As well as the head box. So I will not have room for many extra controls. Thought of combining the Jube and 2205 in a build as well. Would be cool to have a Jubilee with a real reverb circuit! And speaking of the 2205 Split channel, I have two from 1988. One is modified and hacked up pretty good from my younger learning days lol. Other is bone stock. But I have always thought the 2205 Boost channel was a much better soloing/liquid singing sustain platform, and I prefer it for that over my Jubes. But then for rhythm and medium crunch stuff, the Jube wins hands down. The later version II Split Channels are to my ears, brighter and bolder than a Jube. But then more low end thunder and whip ass chunk than a Jube. And the Split Channels might do the best mid scooped tone out of any of my amps . . . . that is, on their own without adding an EQ pedal in front or via loop. The 2205/2210 amps start out with a sizzling .47uF first stage cathode bypass cap. Low value coupler. But then they start adding in the low end big time in the next stages with some crazy plate/cathode stuff on 2nd stage. I am wondering if this is the first production amp to use solid state clipping? The first version Split Channels have a Jose style clipper on the Boost channel volume. Speaking of the hated early Split Channels, is there anyone out there with a first year 1982 or that Anniversary model same year, they would want to trade for a very clean al original 1988 2205? I had a lemon '83 4210 many years ago, but have always wanted to get another early one just for collectors sake. I have two identical '88's, so could part with one lol.