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Checking over my build and wanted to verify the wiring of the output jacks: black wire from the output transformer goes to the output jack sleeves & jack tips connect to the center lug of the impedance switch?
Tx
John

Like the recently-banned Dire Straits song says, that's the way you do it.

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Looking at the pics from danamoose's build it looks like it's wired black wire to jack tips and red wire to jack sleeves. This is opposite what I've done. Which is correct?

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The black wire goes to the sleeve/ground side of the jack.

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What would be the effect of wiring the output jacks backward? Speaker polarity reversed?

Possibly the negative feedback wouldn't work correctly in Tweed mode.

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NFB is fine, I can confirm this.

Your speakers will just be out of phase with normally wired ones. Not an issue if you don't run a multi amp setup.
Though I'd just fix the wiring, it's a quick fix.


Chris...

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So those jacks are insulated from the chassis? The prototype Tramp had cliff jacks, which I'm more used to.

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It's using Switchcraft (non-insulating) jacks.

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In that case wouldn't the hot signal get shorted to the chassis, if the jack is wired backwards?

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Great tones come in small glass jars!

I'm a bit out of my comfort zone here, so I may be missing something......but since we're dealing with AC isn't the signal flow constantly flipping anyway? I understand that the speaker phase is important in terms of phase-cancelling with multiple speakers/cabs/amps, but the speaker polarity shouldn't have an impact on the nfb signal should it?

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We hav e seen it work both ways.

Ideally, the hot from the OT goes to the impedance switch and on to the tip of the output jacks, The switchcraft jacks are grounded to the chassis.
There was an error in the layout, which was corrected in the presentation handout so some gremlins got in.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

As said it works either way.

AC signal, so hot is constantly changing.
Reversing the output jacks is just going to change the phase of the speaker.

Like if you have the impedance selector going to the tip and the common wire on the OT going to the sleeve and you apply a positive voltage to the speaker will move outwards. Reversing the tip and sleeve connections will just cause a phase reversal. When you apply a positive voltage the speaker will move backwards now. Not an issue at all really. Only time it would be a concern is if you were running a multi-amp setup and needed all the speakers in the same phase (otherwise you would get cancellation, would sound weird).


Consider this...
Speakers are AC devices...
Yet their terminals are marked with + and -...
Why?
So that all speakers are hooked up in the same phase!

If manufacturers didn't designate one end of the winding on the speaker as + and one end as - we would all be wiring our speakers in different ways. Some would hook the "hot" up to one end of the speaker winding and others to the opposite end. So yeah, it's all about phase and making sure all speakers "play nice" with each other.


Chris...

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