dual input OT primary?

[pjd3]

Hello. I assume this is a grand long shot but here it goes:

Has anyone ever heard of either an Output transformer that enables 2 separate output sources into a single secondary output tap?
Or,
A circuit that would combine the output from 2 audio power output sources?

I don't expect that their is any reasonably simple way to provide this but, had to ask. There is one scenario for a project where this could be an alternative "if" it existed.

Thanks,
PJD3

[Stevem]

Why?

If you run at least a quad of tubes then 1 ( or 2 in the case of a sextet) on each end of the primary can be of a different type, or even of a different output class like with what Mesa did with there simul class output stage in the bogies.

[pompeiisneaks]

I think the question he's asking is different.

The idea I'm seeing is can you take two unique audio outputs (like a stereo setup) into a single OT or some form of OT merging topology.

In every case I've seen the stereo amps use two OT's one for each signal path.

If you're more thinking merging two inputs, there are plenty of ways to do that pre PI. You can either send the signal to either side of the PI in a LTPI or join them together into the main PI input for other types with a couple balance resistors. Example is many fenders have 470k resistors between the output of each channel before the PI input.

Or do you absolutely NEED the output of two separate power tube complements that then are merged? If so why? What would you gain over merging the preamp signal into the PI before output to the OT?

~Phil

[pjd3]

Thank you for your replies to my arcane question!

To be more specific, I was curious about combining the output of a mono tube amp with the output of a solid state power amp, if for instance, you wanted the tube amp to provide a straight non-processed guitar, while the other amp is provided the processed reverb sound.

I realize this is a crazy consideration but, if anyone had designed an OT or circuit that's intended for something like that, I'd be interested. I'm sure there are circuits that could be designed to combine something like that pre-output transformer. Just not sure I'm smart enough to do that.

Thank you,
Phil

[thetragichero]

i almost pick up on what you're trying to ask but there seems to be no practical "why?" so I'd just let it go and spend my time on something useful

[pompeiisneaks]

I don't think that would be too hard, you already often have an effects loop in an amp, the loop could be used to send to the solid state amp AND route to the power amp of the tube side as well very easily.

~Phil