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Jacob

I was expecting LL Cool J content.

I don't often laugh out loud regarding interwebs... but that made me laugh.

Wait, Chris Carrabba is back with Further Seems Forever?  If so, then sweet!!

I know right?

Jacob

One of my favourite bands was Further Seems Forever, who had three studio albums, all with different lead singers, all of which are special in their own ways.

The original iteration of the band is back with a new album, which has me pretty stoked, and they released a great new video for the second single off the album. Check it out

Jacob

Where is your mix knob? Unless your mix knob is all the way up, on vibe mode you will be quiet no matter what. The mix knob acts like a volume control for the vibe mode.

Jacob

I think I spoke before looking it up.

If this were a typical PT2399 which uses a dry path and a mix knob, yes, this would be an easy mod. But because of the way the Cave Dweller is, a %100 wet is not in the cards.

Sorry guys.

Jacob

Try flipping your trannies so the pinout is correct, swapping the correct lugs and such. Once that's done it will tell you what's what.

Jacob

It depends on the transistors you are using and since you didn't specify, I can't tell you whether it's the case. If your transistors are max rated for 8.5 or 9V, than feeding it 9.5V for a while may kill it. Chances are high however, that what's actually happening is that you have some sort of short of problem on your PCB, or in your wiring.

Could we ask you to share some more details? perhaps pictures of the board and a link to the project docs you've used? Posted voltages would help too.

Jacob

I would remove it all, only because once you start it's easier to rewire everything rather than just some things. Besides, some of your pot connections look fishy on the board.

Jacob

You're definitely not getting good voltages. That's a single op amp, and even with it being different than your average single op amp, it should have close to 9V on pin 7, and pin 4 should be 0.

So basically, you've obviously got a short from +9V to GND. That's why things are getting hot.

As to how to find it, that's something you'll have to do. I'd remove the wiring and then see if you get continuity between your +9V and GND pads. If you do, that means the short is on the board. If you don't, perhaps it was in your wiring. If it's in your wiring, rewiring is a good step.

Don't power it up again until you've found the short.

Jacob

Chances are high that boxing it will remove the hum, but perhaps not entirely. Using shielded wire may or may not help. Most of the time, we don't use shielded wire on a mudbunny build, but you could. Try Smallbear for Coax cable.

Jacob

Is it possible that the problem is with V1 and not with the circuitry Paul?

Jacob

Yep I thought that too. I swapped V1 with a few different tubes and I still get the same results.

Worth a try suggesting. Hmm... I'm not an amp guru, but my gut says that your though about the wrong plate resistor might hold true. Is it also possible you're using a bad resistor in there somewhere, one that's introducing the noise?

Jacob

They're NOS type parts, not in production, so it's hit or miss. You could try eBay, but they'll be pricey.

CJ used to run a shop and sold some, so he might have more resources than I do.

Jacob

Is it possible that the problem is with V1 and not with the circuitry Paul?

Jacob

I like that finish Rej. Pretty rad.

Jacob

Nope, not the right type. They can be used, but as you mentioned, the lead spacing is wrong. You could use 3362 type trimmers instead if you can find some.

Jacob