Marshall 2204 FX loop

[SoundCity85]

Hello,

I had great success with adding an FX loop to a DR103 preamp. Now I'm considering the same for a Marshall 2204 build. The only difference is that there is no free triode available, so I will wire in a new socket and two triodes become available for the loop. Looking again for the same concept, a level control pot on the outside, and a bypass switch. Can anyone suggest me a schematic? For the DR103 it was placed in between the treble pot and MV pot (https://el34world.com/Forum/index.php?topic=26300.0).

Best regards

Dominic

[Latole]

I'll use same circuit as the DR103

I'll put phase loop between Treble pot wiper side to the the side or Master Volume pot.

[pdf64]

...a level control pot on the outside, and a bypass switch. Can anyone suggest me a schematic?...

Are you bothered about the loop flipping the signal polarity? I assume not, as the arrangement apparently used on your DR103 would have done that.
As you've now got 2 active devices, you've got more options, eg see the Merlin loops on that thread.

[2deaf]

Here's one.