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That’s a shame to hear. I will box it up again today and will see how it behaves. The Aphex EQF-2 could be a cool project to breadboard? Thanks again Dave!

I can imagine that it’s not a clean copy. The Mesa 5-band seems more like a copy of the Mesa (I checked the Mark IIC schematic) and it’s more useable to me. Thanks a lot for your help anyway!

I don’t have a scope but I did notice strange oscillation with an RC4558 opamp instead of a TL072 on most positions of the High pot. So should there be a resistor between 6 and 7 of IC8B? The 100R/100k divider fixes the EQ1 issue but both EQ1 and EQ2 on is too noisy IMO. I won’t use both...

Normally both EQ circuits are directly connected to each other and active. EQ1 is a 3-band semi parametric EQ, sort of a clone of the Aphex EQ used by Metallica among others. I wired the I1 and O1 to a separate 3PDT connected to the input jack. This 3PDT is wired to the second 3PDT which...

Ok, I've been experimenting with this and the issue has nothing to do with the B10k High pot. I did resolve it and I'll explain what the issue was. I replaced the High B10k pot twice and it kept crapping out the circuit. I tried different opamps and with an RC4558P the high pot worked full...

The 47n cap was touched by my solder iron when reflowing the high pot. It’s from the second EQ so no influence on the issue.

Pics of top and below the high and high freq pots. This is the EQ PCB documentation: https://kurtballou.com/docs/N.E.W.%20TTTSNB%20EQ%20PCB%20Build%20guide.pdf%20

I’m not sure that would really help. What’s could be causing this behavior is the most importantly question for me. Voltages are normal on the TL1054 and TL072s EDIT: pics posted.

See my post in the troubleshooting area. LT1054 issues have resolved, different issue now.

I’ve posted an issue with the God City TTTSNB EQs PCB last week relating to the LT1054. I’ve replaced the burnt out LT1054 with a new one and the build is working again. The left side EQ (Mesa 5-band) always worked well without issues. The right side 3 band semi-parametric EQ has had issues...

I’ve ordered some new LT1054 and found an elco cap on the PCB that was connected to the LT1054 of which the leads were very close to eachother, so maybe that caused the issue. Will start a trouble shooting thread when the problem persists.

I validated all components and they all match the build docs. I remember that I replaced the 1k led resistor with a 5,6k which I also used for the preamp build. It’s close to LT1054 but I doubt if that would cause the overheating? I couldn’t measure the 10pf cap with my multimeter, maybe too...

I'm building the TTTSNB from God City Instruments https://www.godcityinstruments.com/collections/diy-pcbs/products/n-e-w-the-thing-that-should-not-be. I'm placing both PCBs in seperate BB enclosures. I've already finished the Preamp but there's an issue with the dual EQ pedal. I've populated it...

Maybe something like this could work on the ISO mode using a transformer: https://www.radialeng.com/product/bigshot-aby Might need to combine this with something like this probably: https://www.radialeng.com/product/bigshot-efx

I’ve been experimenting with a routing setup that produces noise into the signal that I haven’t been able to solve. I tried a Lehle D.loop SGOS in which I routed 3 loops: one containing a Tonex pedal, one containing a UAFX Lion 68 and one containing a Bogner Ecstasy 101B amp head going into a...

Have you used an audio probe before? Use the schematic and start from the first component of the left side and forward until you get a volume drop. That should identity where the issue is

Having the external bias fully counter clockwise leads to a gated/splatty fuzz sound if you've biased to 4,5v with the external bias in the middle? The internal clean trimpot can also be set to the wrong side so having maximum "clean" and no fuzz. But you've seemed to resolved your issue. GT308...

Was the clean pot not set to max clean and not to no clean? Did you validate? Your fuzz shouldn’t sound farty if you biased at 4,5v. Do you have some other PNP germaniums to try?

Try the clean pot to max to see if that brings in fuzz. Also reflow your pots, they seem kinda “cold”. Are you trimpots the right values?

I’ve been reading about the transistors used in an 808. I’ve build a Dwarven Hammer (Prevision Drive) using 2n3904s. Some mention on other forums that a 2n5088/2n5089 combo or 2n5088 (Aion used these) or 2n5089 pairs are preferred, 2n5089 having the lowest noise. BC550 can also be a good one...