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I was curious if there is a schematic available for the Trilater tube buffer effects loop? I am looking at the RC network across the passive effects loop that the amp comes with and I’m assuming its purpose is to attenuate the signal a little when the effects loop is not being used. I’m curious if the Trilator buffered effects loop has a similar RC network across it when it is being bypassed in order to keep the signal approximately the same in the way passive effects loop operated.

Also, in other schematics, the RC network of the 220 K resistor and 500 pico fared capacitor in parallel come in to the circuit when the effects loop is being used and are is bypassed when nothing is plugged into the effect loop. Seems to be the opposite set up in this layout. Any thoughts on one version or the other?