Posting a link to your website might be helpful

It sounds like you have a too low corner frequency in a high cut filter somewhere. Try removing c3 and c4, and see if the issue persists. THANKS for the assist. I removed C4 and high pitched squealing all around, but when I replaced it used a different cap which solved the issue just fine. I measur...

Did you maybe mix up C3 and C4? Nah, those are correct. I should mention that i've checked my build a few times now. Accuracy to the layout, and that all the parts are of the correct value. I started with 2N3904 transistors and had the problem, then tried replacing them with MPSA18 (the reissues ca...

Howdy All, Been messing around with the MXR Blue Box circuit and i'm running into an issue. Basically i'm getting a decrease in volume the higher the note is that i'm playing. Notes played on the low E string are loud and clear and as I move up in frequency the volume drops to the point where an ope...

cspar wrote: ↑07 Oct 2022, 21:29

Dr Tony Balls wrote: ↑07 Oct 2022, 13:53 Wasnt the original Small Bear guy named Steve Daniels? Is it the same one?

Yes, one in the same.

Neat! Didnt know that.

Wasnt the original Small Bear guy named Steve Daniels? Is it the same one?

I can't edit the original post, it seems, so here are the images from it: https://live.staticflickr.com/4436/36271102161_f027043964_c.jpg https://live.staticflickr.com/4357/35572790714_63735a4fb9_c.jpg https://live.staticflickr.com/4393/36271100741_09e8c319ed_c.jpg https://live.staticflickr.com/4405...

Those Blencowe books cost $40 new.

Build circuit point to point in 3D as to fit a vacuum tube Make sure all external connections (in, out, pots) are on one side Make a mold using an EL34 Suspend circuit inside mold and pour clear epoxy resin Mount epoxied circuit to tube base, connections soldered to tube pins. Get Hammond box, moun...

I've built a tube driver in the BK Butler / Baja / Madbean Archibald vein and just noticed something that i've not come across before. I'm getting hum (120Hz) when using linear power supplies such as a Boss PSA-120T, but i'm not getting any hum when using a switch-mode power supply such as the Boss ...

Thanks for the information, but unfortunately this didnt seem to do the trick (unless i'm now missing something different). I reconfigured the charge pump to provide +/- 12V and got the same results. U It's not about negative voltage reference, but a cathode resistor/cap combo which you've butchere...

This is a misconception, you cannot replace this split power supply with a single 24 VDC supply, which results in completely different operating points of the tube stages. The negative voltage together with the cathode resistor forms a so called pseudo constant current source. This means that half ...

Hi all. I'm trying my hand at a BK/Baja Tube Drive kinda thing and running into issues. I'm wondering if there's something i'm not getting. The original units ran off 120VAC, with a transformer to step down to 12VAC. 12VAC went to the tube filaments, and some rectification happened to provide +12VDC...

... was asked to provide Marshall amplifiers. Now, in typical Dutch fashion, Jan thought them to be a bit expensive for what they were and decided to contact a local electronics repairman and musician Piet van Schaaf to build him some Marshall clones ... Amusing that's essentially how Marshall came...

So yeah....the curious point still remains to me. How are they getting 240VDC from a 9VDC supply? Hi Tony, The usual way to obtain relatively high voltage at low current is by means a step up converter. Several tube implementations employs a gadget named "nixie power supply" as per the fo...

Interesting, but they dont show the power supply for B+ or the filament voltages, which i'd think the most interesting part. Couldn't you calculate your way back from the 115V plate voltage? Top right is the filament wiring, I think, running off DC (why not?) Isn't the distortion coming from the tu...

Interesting, but they dont show the power supply for B+ or the filament voltages, which i'd think the most interesting part.

Bononoob wrote: ↑11 Jul 2021, 23:30 based on a silicon Fuzz Face

I dont see any part of this that's based on a Fuzz Face, imo. Im sure its a cool circuit, just an odd reference.

Branimir wrote: ↑02 Jun 2021, 19:40 might build a neat amp with it.

I did this for one of the Tronographic guys with a gutted pedal PCB and a Sunn/Dynaco backend:

Hi. Looking at a fuzz for a friend and it's got a strange problem that i've not encountered before. It's a MK1 Tone Bender type (Maestro FZ-1, Zonk, etc) made by someone that's not me and it sounds pretty good but when you really dig into a chord, especially a low one it seems, there's a brief volum...