Mixing Channels with Virtual Earth?

[Mr. Lime]

Thinking about different ways to blend clean and dirty channels I'm wondering if a virtual earth summing triode is an good option?
The gain stage with local feedback could serve as a cathode follower /FX Loop send.
Problem could be the tone stack of the dirty channel but it also could pad the signal down near to the level of the clean channel.
Am I on the right tracks with the mixing resistors or what else is to consider?

Thanks a lot!

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[luix]

Virtually the 470k resistors are high enough to isolate the two circuits from each other, but I think that the tonestack of the upper circuit will also act in the other channel, maybe just a little bit but can be subtle and annoying.
The best solution is to buffer the upper channel.

The only way to be sure is trying it

[pdf64]

Virtually the 470k resistors are high enough to isolate the two circuits from each other, but I think that the tonestack of the upper circuit will also act in the other channel, maybe just a little bit but can be subtle and annoying.
The best solution is to buffer the upper channel.

The only way to be sure is trying it

That may well happen with a regular passive mixer.
But surely the virtual earth would act to eliminate that? That’s kinda its raison d’etre

[TUBEDUDE]

You could reconfigure as an anode mixer.

[Mr. Lime]

An anode mixer would cause phase issues and the low output impedance woulf be gone.

I‘m more after a cathode follower with double function..

[luix]

You could reconfigure as an anode mixer.

This is a good idea, unless you have arranged the circuit in that way for some "sound" related reason, the anode mixer will be a better solution, I've successfully used with JFET transistors and I think that also with tubes will work.

anode mixer.png

[Mr. Lime]

I once tried an anode mixer and it didn't worked for me. I married a two stage with a four stage channel in front of a shared tone stack but I had squealing problems.
Anyway, an anode mixer isn't an option here and not of my interest.