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 Post subject: Fx loops phase
PostPosted: Mon Feb 10, 2020 1:18 am 
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Joined: Mon Feb 10, 2020 12:30 am
Posts: 8
Hi there

I haven't seen much documented anywhere about the two effects loops being out of phase from each other. Each return feeding both inverting and non-inverting sides of the PI

This won't work with stereo units like my H9s that blend l+r in some algos. Plus this type of passive loop has a hot signal. If I drove the preamp hard in my ef86/el84 badcat it would clip the loop before I could get useable preamp overdrive .

I am thinking of a dual Buffered dumbulator type circuit that has a Dual phase reverse( in and out) for one channel. With a divider in front to drop the level , and 2:1 make up gain on the return.

So questions for the smart kids

What would be the ideal impedance to load the send and not skrog the eq?
And best impedance to load the PI inputs , both phases?
I believe the input is high Z 1Meg
And the PI in would be hopefully low Z??
And for extra credit...
which 3.15v tap is out of phase from the 5v tap?
I am considering a small bridge rectifier and filtering for a 20mA 8.15V supply ... to drive the opamps.

And hi there! I'm the new guy. My TC15 is on the way.
.... to replace my badcat that got smished in a wreck.


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 Post subject: Re: Fx loops phase
PostPosted: Fri Feb 14, 2020 8:20 pm 
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Joined: Wed Aug 26, 2009 11:27 pm
Posts: 273
Location: Ontario
I sorta don’t understand what your asking

If I recall correctly the 2 preamps in this amp are out of phase with each other. And feeding opposite sides of the pi. Then being in phase going to the power tubes . Hence why you can jumper the channels and have them not cancel them self’s out .

Are you asking if you can send both preamps to a stereo effect than return them to opposite sides of the pi ?





Trying to make 8.15 v. That way would probably be a bad idea.
Most would have a separate low voltage transformer for something along the lines of signal switching or boost switching


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 Post subject: Re: Fx loops phase
PostPosted: Fri Feb 14, 2020 10:51 pm 
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Joined: Mon Feb 10, 2020 12:30 am
Posts: 8
Sorry for the confusion . Likely not an issue.
... but no, stereo effects like H9s or strymons would likely not work well at all in stereo with the loops out of phase. And I do hope to jump the channels.

But a buffered loop system that flips the phase in and out for just one channel ..would allow for stereo processors without the phase cancellation.
Probably not worth the effort, but could be useful.


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 Post subject: Re: Fx loops phase
PostPosted: Sat Feb 15, 2020 10:16 am 
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Joined: Wed Aug 26, 2009 11:27 pm
Posts: 273
Location: Ontario
Since it’s a mono power amp stereo stuff would be while.

What I have done in the past is sent to a stereo effect return one half to that’s same amp and send the other half to an effects return or power amp in on a completely different amp


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