#124 Loop Compensation Network Question

[Guitarman18]

I'm just getting back into some amp building after a break, and am doing another #124.

I've been looking over the files section and Tony's amazing layouts, and have been wondering......I always thought that the 'Loop Compensation network' (or whatever I should call it) in #124 was so that it would compensate for the added highs when a D'Lator was not being used. However, looking at the layout, it seems that the resistor and capacitor are in circuit when something is plugged into the loop! Surely, if the network was to be bypassed when something was in the loop, the wire from the master volume/tie point should connect to the preamp out jack? So what is it really supposed to do?

If anyone has got a few seconds to spare and could explain what I seem to have missed I would really appreciate it.

Cheers,

Paul

[erwin_ve]

Hi Paul,

When a jack is in Power amp input the network is activated. So the signal goes through the 220k//250pF. It adds a little spark when using the loop.
When no jack is in the power amp input the signal from the master pot is going directly to the pi input, so the network is bypassed.

Erwin

[Guitarman18]

Thanks Erwin,
I had it in my mind that the network took away some highs, rather than adding sparkle! It all makes sense now; I knew that it had to be something like that. The same end result but from the opposite direction

Good luck with your builds and best wishes,

Paul