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Top - Sziklai RM-thing. Bottom - CMOS Muff. Built, zero sound from the top side and super quiet, very trebly output from the bottom side. Only have done a quick poke at voltages and everything looks fine - I've got supply, vref and about 7v going to the 4007. Thanks!

Working on rejigging my tube workshops, and decided to do a pretty basic triode project - Merlins LV triode clean boost. Before I got PCB's made, I cut a stripped down version on the CNC only to forget about vertical height requirements - it was a bit of a shitshow to get it into the enclosure...

EEV blog post mirroring my experiences Their customer support has now been saying for 6 weeks that PayPal is "temporarily down" while they've deleted all mention of it from their website. Payoneer isn't available in Australia, and even then there are some real concerns using it ($20USD minimum...

Howdy, I've been on that FET binge while looking at amp/preamp emulation, and came across the original Foolin' With FETS article which includes a push-pull stage. With that in the back of my mind while I was looking through other schematics, I noticed pretty much just everything uses a SRPP (or...

Howdy, Now I've had time to work through a couple of outstanding projects, I've finally got a chance to look at one of the white whale projects I've been poking at on and off for about two years - a two channel preamp. It's not anything too fancy or outrageous, I've just never really had ideas...

Honestly, bit of a pain in the ass to build with a very compressed board layout. Most of the drilling was just done by eyeballing everything and I think I got PRETTY close. Using a pair of EAA91 with starved heaters as the clipping diodes, with a switch to disconnect one side of the clippers -...

Probably the best finish I've gotten on a pedal so far. Drill guide didn't QUITE line up, but close enough I could make it work. Top plate is anodised aluminium I laser engraved, everything else was pretty standard with a hand picked MP20 (84hfe, 90ua of leakage). Is it worth the hype? Not...

Howdy, I've just had my third order turn up from SOVCOM on eBay - first two orders were perfect (and 10/10 transistors I ordered were right in the middle of the gain ranges with minimal leakage), but this order got lost somewhere in the Ukrainian post system (which is understandable given...

All switches/knobs do something, but it just sounds incredibly misbiased - no sustain, super farty, etc. It does appear the tone controls are working, but it's really hard to hear with how little noise I get out of it. Confirmed all components are correct (couple of minor changes; pulldown is...

I've had an idea for finishing a Duocast enclosure off and I think the easiest way is going to be CNCing an aluminium plate (and filling the etching in with black paint). Has anybody done this, and if so what thickness/etc of aluminium did you use?

I've been making these for a while, and it's such an incredible circuit that I definitely want others to try it out. Has anybody seen something similar to this staging? I've done a bit of searching for similar distortion pedals and haven't come across anything at all. Of all places, it...

G'day. Been noodling through this design and made it up to the tonestack portion. The preceeding stage has a reasonably high output impedance, and I'm running out of board space. It's a CMOS Muff-ish thing, so I've got 3 preceeding gain stages. A solution I found was using an active BMP...

Finished up a micro overdrive for a friend, and for an extra little bonus I laser marked his band logo onto the front. There is a weird shadow as the scaling got all fucked up while doing the marking, so I need to spend a little bit of time cleaning the enclosure up before I hand it over...

G'day, Bought a couple of cheap grab bags of germaniums out of Eastern Europe from eBay, and was expecting a reasonable rate of failure due to leakage/poor gain - and to my shock, there was only a single bad transistor! I've got: *half a dozen GT402B's (100-150hfe, <150uA of leakage) *handful...

I feel like I am going crazy here. I've used Kicad 5 through 9, and a lot of the PCB editor changes have been particularly frustrating. My newest problem is that no matter what I do, my silkscreen layers disappear under any copper layers making it very hard to see what's going on. PCB created...

Been trying to see when this bad boy is gonna be in stock. Sent off a couple of messages to find an ETA and gotten no reply. Anybody know roughly when they're going to available? Postage to Australia sucks so trying to get a couple of boards together. Cheers!

Howdy, Built a King Nothing. Everything works fine, voltages are spot on (254v on the plate resistors, and 29v heading into the J201), but there's significant amounts of oscillation that decreases as the gain is turned up. Low switch has no impact on the noise, but the left position of the mode...

Howdy, Doing some fundraiser builds for somebody in my extended friends circle dealing with cancer, and the artist doing all the artwork for the builds really enjoys glitchy/super wild sounds (he owns a bass with a pedalboard literally built into it). I suggested we go for a suboctave build...

Had a couple of wah enclosures sitting around that I've been slowly rebuilding for a while. Had a couple of days off over Xmas and finally decided what I wanted to do with one, and I think it turned out pretty well. This was a test to see how laser cut bamboo would work for pedal enclosures...

Had a guy bugging me for weeks about building him a tube preamp/distortion pedal, and to my absolute shock he actually paid once I steered him towards this! Using one of the C2CE PCB's, and a pair of Shuguang 7025s (probably the best new, non-stupidly priced 12A*7 variants I've found). B+ is...