Hi, is there any advantage to tying the hard clipping diodes after the first opamp stage to 1/2V (Vref) instead of ground? Does this affect the distortion in a different way? The circuit is DC coupled between the two op-amp stages, which means the signal is biased around Vref. Hard clipping here mu...

Hi, is there any advantage to tying the hard clipping diodes after the first opamp stage to 1/2V (Vref) instead of ground? Does this affect the distortion in a different way?

now sold!

thanks for the interest all!

Hi All, I'm selling my wah enclosure. It's just been gathering dust, and it may as well go to someone who will use it! It was used about 3 times before I took the PCB for another project, then it became a distortion pedal for a while, hence the two holes drilled on the front. The pot included is a H...

Hey guys. Had an idea there recently while replacing an output transformer for the Epiphone Valve Junior. The owner wanted a load box with a line-out tap installed too, so no speaker would be required. I got to thinking.. could the output transformer not have been replaced with a 5k resistor (thats ...

This channel has a few vids, including the Tech21 esque pedals. https://www.youtube.com/user/slidemeisterstore

Can anybody help me with this? I've always wondered how. I love the coloration it adds, and would love to implement it!

thanks!

Im not building it until I hear how it sounds through a 65 amp SoHo. PGS needs in on this

excellent, thanks dude! anybody been working on a single sided layout? i would love to fire this up!

This looks like an incredible project.
has anybody created a single sided pcb version? also what sort of current drain does this have? for finding a transformer.

all these links seem to be down? all images come up as links. a lot of kmg's articles are down too.

Hi, I'm experiencing a strange distortion on this preamp. It looks like asymmetrical hard clipping..very harsh sounding; especially when boosted, so I decided to investigate. All scoping was done using a 440Hz Sine wave. V1a (gain stage 1) is perfectly fine, no distortion. A little bit of compressio...

Excellent work lutor! How does it sound? Any clips?

Thanks for your advice, I took a similar approach with my jamman. It was a dodgy coupling cap, also the valve was playing a part in it too. both were replaced and all is well!

Came across this today when looking at the stompboxes.. http://www.daphon.com.cn/english/ProductDetail.aspx?id=365 I wonder how much it costs? :twisted: http://www.daphon.com.cn/Manage/uploadfile%5C20100517064349GT15HA.jpg GT15HA Output power:15w Impedance: 4Ω 8Ω 16Ω Effcets: Distortion Functions: H...

Hi, I've converted my windsor pre-amp into JCM800 2203 specs and im noticing its quite fizzy. without being driven the fizz is triggered by most notes on the fretboard, except really high ones on the thin e string. the fizz isnt overdrive, it is the same note/tone no matter what is struck. I have li...

I've actually found something that might be the problem. When I turn the presence knob, nothing happens except a bunch of strange, cloudy noise. I need to check the board again :hmmm: I'm getting a similar problem to this, I've checked everything. The presence knob seems to crackle and add a lot of...