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Adding XLR / 1/4 Out for direct input to a board.

@Steviewevie95

The slave is sampled off the 4 ohm speaker output, so you get the sound of the preamp and power amp.

Here's a drawing of the circuit I found.
upload_2020-4-22_3-7-19.png

Note the ring of the 1/4" jack is not connected to ground. With the proper 1/4 to XLR adapter it might function as an impedance balanced circuit, although I can't say for sure.

IMHO it would be better to use a DI.
 
depending on what you like to do, just go ahead and try the signal straight from the tab (always have a cab connected, though) and see how well it does.
Should you encounter ground loops, humming or other noise that might come from not having a symmetrical signal, add a DI.
I've done some low budget recording and I used a line out in one instance and went with an active bass straight into the audio interface in another, both worked well.
 
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A direct box is definitely indicated, but in this application--taking a line-level signal from the output of the amp--a seriously good DI like a Countryman isn't really necessary. A regular ol' passive transformer box like a Whirlwind Director would be more than sufficient, and probably not half as many $.
 
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Passive DI's aren't hard to build, if you know much of anything at all...they're little more than a transformer and the appropriate connectors and packaging. A Google search will turn up a bunch of things; here's one source that appears to have a pretty decent explanation as well as build-it-yourself instructions. http://www.nfaudio.com/wp-content/uploads/DIY-DI.pdf

Another DIY DI box: “Boutique” DI box on a budget
 
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Passive DI's aren't hard to build, if you know much of anything at all...they're little more than a transformer and the appropriate connectors and packaging. A Google search will turn up a bunch of things; here's one source that appears to have a pretty decent explanation as well as build-it-yourself instructions. http://www.nfaudio.com/wp-content/uploads/DIY-DI.pdf
Interesting, thanks! Wondering if my old Studio Projects VTB1 preamp has enough parts to harvest for this. I’m trying to learn pedal mods and lower-level builds.
 
Interesting, thanks! Wondering if my old Studio Projects VTB1 preamp has enough parts to harvest for this. I’m trying to learn pedal mods and lower-level builds.
Sure it has plenty of parts, but not the right parts. Since the VTB1 is transformerless, it's not going to be useful.