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TL072 LF353 NE5532 LM1458 4558 literally any dual opamp will work. (personally i wouldn't bother with the OPA2134 for a drive circuit) as mentioned above, if you use an 8-pin IC socket (or build the circuit on a breadboard) you can then audition any one of these opamps to determine which you...

https://www.taydaelectronics.com/axial-ferrite-bead-76-ohm.html im guessing these will probably do it

no worries, we all have our errors 🤙

this will definitely fuck up Q3's idle bias. once you've corrected this, check Q3c again. shouldn't matter at all. doesn't matter. 100n is 100n, they should perform the same in this circuit.

yeah something's going on, you should be able to dial it around 4.5v (although it's a taste thing, i prefer around 5v) what value is the bias trimpot? we will need clear, in-focus, detailed photos of both sides of the board/build to determine this.

+1 this is how the jack needs to be hooked up: also - from the photos, it doesn't appear that all of your ground wires have continuity with each other. they should. - great way to do this is to ensure that all ground wires meet at the input jack sleeve.

unfortunately buying opamps from amazon will be as likely to land genuine units as me shooting a 3-point basket blindfolded. it's probably the only component type (ICs) in this entire game where using genuine parts matters. please install some genuine opamps.

we built FET city, we built FET city on thru hole board

for what it's worth, you can actually just sub the JFET for a 2N5089 (or probably a 2N5088) and it doesn't sound any different. (per breadboard investigations). it's just an input buffer. good call. maybe drop in something guaranteed genuine like a 4558 or whatever and see if it works (opamp...

if so, your amp is operating as it's supposed to. that's what the master volume is for, and this is normal.

i’ve built the 100W version of this. selecting the crunch mode (from clean) in the ‘normal channel’ should result in a large output volume increase. if that’s not happening, i’d suggest carefully reviewing the wiring around the toggle switches, for a start. the amp shouldn’t need mods to make...

i'm seeing this as a good thing. looking at the schematic, appears this could be a fun distortion. i'd breadboard it.

no idea if this will be to your standards/expectations, but i did a plexi-inspired build of the mofeta and i thought it was alright.. https://forum.pedalpcb.com/threads/%E2%80%98jmp-super-fet%E2%80%99-mofeta-eae-model-fet-w-super-lead-plexi-inspired-mods.25666/

cheers 🤙🏻 hell yeah it’s got some big bottom going on, perhaps a bit dull on its own, but stacked with something like a RAT in front, it’ll do the thing.

today’s forecast has been like this 🥵 (degrees celsius) so what better time to do a build demo for an infamous pedal circuit that has certainly copped some choice opinions in recent times. to make matters worse, i was impatient and didn't wait for the trace to be released, drew a vero layout...

do it. breadboarding might seem like a time sink but i see it as an investment in peace of mind. really helps answer those questions. ay cheers! i love them equally. i guess it depends if you’re in the mood for a rat or muff flavour no worries 🤙🏻 thanks - i was kinda unsure about this take cos...

this build is the result of trying out the scythe / tone reaper schematic on a breadboard sesh, and i was immediately impressed with just that one alone. seriously, the tone reaper / scythe fuzz is hecking brilliant. go build one if you haven't. but i decided i might as well just go with the...

this looks so good. great layout and lettering, clean gutshot too. heck yeah

from this photo in the ad you linked - looks fake. if you want genuine, ya gotta buy em from mouser. https://mou.sr/4r0AHOf this is a mouser-sourced OPA2134PA: although if you just want to get on with life and not waste aud$11.94 on x1 dual opamp, a TL072 should suffice.

sometimes this just happens. recently, ive breadboarded a JFET distortion circuit which also called for 50K trimpots, but i found one of the JFETs couldn't achieve a bias range that i was satisfied with. so i just swapped the 50K trimpot for a 100K trimpot. this solved that issue. i suspect...