Schematic for review

[Howlin' Mad Mac]

Hmmmm, ok I'm following what you're saying here & I like the idea of voicing the other input brighter. I'll implement tonight, revise & post. As far as how the gain stages are connected you were correct as I was thinking they were cascaded however, the effect I'm after is where guys would take a Plexi, plug their instrument into input 1 normal then plug a short jumper from input 1 low to input 2 normal. What I'm shooting for is an amp with similar tone & character to a Plexi w/ the ability to switch to this "Jumped" Plexi configuration just with less output power. Even then, 18 watts is more than adequate for most places I'd play so the master volume is much wanted addition. As with other amps I own, while at times it is nice to have seperate TMB controls, to me there's a very soulful connection when using an amp with a simple, single tone control yet I've always liked how adding a little presence kind of gives you a pleasing mid-boost so I've kept it. Regarding use of single tone control I would still like this amp to sound very Plexi-like so please let me know if I should tweak the tone control cap values I've indicated & again many thanks.

[tubeswell]

As far as how the gain stages are connected you were correct as I was thinking they were cascaded however, the effect I'm after is where guys would take a Plexi, plug their instrument into input 1 normal then plug a short jumper from input 1 low to input 2 normal. What I'm shooting for is an amp with similar tone & character to a Plexi w/ the ability to switch to this "Jumped" Plexi configuration just with less output power.

That jumped configuration is putting the inputs of both V1 stages in parallel. Thecascaded option is having one stage following the other. The dumb idea I posted is to use a DPDT switch and the switching tips on two input jacks in order to be able to switch between either 1 x hi-Gain input, or 1 x Lo-gain input, or two cascaded inputs, or two parallel inputs.

[Wilder Amplification]

Hmmmm, ok I'm following what you're saying here & I like the idea of voicing the other input brighter. I'll implement tonight, revise & post. As far as how the gain stages are connected you were correct as I was thinking they were cascaded however, the effect I'm after is where guys would take a Plexi, plug their instrument into input 1 normal then plug a short jumper from input 1 low to input 2 normal. What I'm shooting for is an amp with similar tone & character to a Plexi w/ the ability to switch to this "Jumped" Plexi configuration just with less output power. Even then, 18 watts is more than adequate for most places I'd play so the master volume is much wanted addition. As with other amps I own, while at times it is nice to have seperate TMB controls, to me there's a very soulful connection when using an amp with a simple, single tone control yet I've always liked how adding a little presence kind of gives you a pleasing mid-boost so I've kept it. Regarding use of single tone control I would still like this amp to sound very Plexi-like so please let me know if I should tweak the tone control cap values I've indicated & again many thanks.

It's actually the high input of the Bright channel they plug into (Input I high), then jump bright channel low input to normal channel high input. This circuit here uses a DPDT switch to accomplish exactly that, using resistors to give you the equivalent input circuit in both jumped and un-jumped mode -



I used the '69 era plexi front end circuit in my scheme. You only need to change a few values to go to the earlier versions.