Paramix: zero sound

[Johnnysmoke]

I have finally built my Paramix V4 – I’ve had it lying around for several years. After the off-board wiring nightmare (LOL) was finally over, I powered it up and…

ZERO SOUND OUTPUT. Not even a hiss. Nada.

Question 1: Shouldn’t there at least be sound coming out of the “Dry” send or the “Wet” send? – because in my case, there isn’t. Nothing out of the output jack, either. Does not matter if the foot switch is engaged, or isn’t. And I mean ZERO sound. NO hiss, not anything. BTW, I even used patch cables on both send/returns, even both loops at the same time to make sure the send/return loops were closed. ZERO SOUND from the output.

I have spent 7 hours troubleshooting: I’m not an electronics expert by any means so checking resistances and/or pinouts on the opamp are a bit out of my league, but this is a low-count PCB and checking to make sure resistor/capacitor values is not much of an issue. I’ve completely taken everything out of the enclosure, and gone over the PCB with a fine-tool comb looking for soldering bridges, wires in the wrong places, etc.

I did check on the backside of the PCB with my voltmeter to make sure the resistors are the right values, and they are.

I have checked, checked, and checked again that all the wiring is correct. I even re-flowed a few solders here and there. Nada. I removed the T-Diddy Boost Mod (OH NO!!) and wired it ‘normally’ – still not a sound, no change at all.

The LEDs for the foot switch and kill switch work and light up correctly.

I was wondering if the TL074 might be suspect: I only have two, so I replaced it with the other one I have. Still no sound (I think I got them both from Tayda long, long ago)

If someone says “Oh, yeah, definitely the TL074” then I’ll order more. Otherwise, I’m building a sound probe tomorrow (I should have done so a long time ago, but this is my very first build that hasn’t worked. This is pedal build #13. I’ve also wired up 6 guitars and 3 basses without any issues. I’m not saying I’m an electronics expert by any means…but I’m decent with my Hakko) and I guess I’ll spend another hour or two on it.

Thanks for any help/ideas.

[Crumpred]

Bummer … Posting pictures might be helpful.

[Johnnysmoke]

I thought of that, believe me. The off board wiring though…its like looking at an exploded bowl of spaghetti. Not a lot to see through the many, many wires on this puppy.

[Steve]

Johnysomke, you might be surprised at how good some of the Admins/Members of this forum are with seeing a couple of pictures. Sure as heck can’t hurt. Just sayin’. 😉

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