Using the second input of the LTP?

[H Chandler]

Aiken talks about using the second input of a LTP for adding a second channel. Has anyone tried this. How did it work?

Also, how much gain can I expect without compromising frequency response and output impedance?

Thanks

[HTH]

Aiken talks about using the second input of a LTP for adding a second channel. Has anyone tried this. How did it work?

Also, how much gain can I expect without compromising frequency response and output impedance?

Thanks

look at the AC30 schematic to see how to use both sides of the PI for seperate channels.

alternatively, just use the one side of the PI (like Marshall) and mix the channels with 470k resistors.

[Ben N]

Can that be done (like the Vox) in an amp that uses one input of the LTP for NFB? (I'm guessing no, right?)

[Earl]

That's pretty much the case. If you use the same LTP input for NFB and a channel input...that channel will have positive feedback.

One solution would be to sue local NFB at the output stage. (assuming you want NFB)

[Don Moose]

Ultralinear operation is a sort of local NFB in the output ... sort of.

See the 135W fenders for an example - though they used both UL and global NFB.