Distortion pedal build - Page 9

shanx · 24th April 2012, 12:43 PM

By the way razorrick, I went over to my friends place to show him some of the settups of the pedal I made for him, and he really liked the diode connected mosfets sound. It sounded quite smooth with their body diodes clipping, put a bit of the soft clipping in there too..sweet. His amp is tube preamp, with SS output. The LED/Ge diode works for my setup but there are quite a few other combos that are nice.

razorrick1293 · 24th April 2012, 01:21 PM

sounds interesting but wouldnt that just be clipping the same side of the wave after its been inverted?

shanx · 25th April 2012, 02:31 PM

yes in theory at least that is the way one would assume would work. but depending on the clip point at first stage,if it is slightly clipped at first stage, then brought to post clip after some filtering..if the post clip is a higher voltage threshhold, it imparts a different sound. That is the staging I hear on it when setup that way. more 3 dimensional sound. I will sketch up something, but it will follow the same sort of ideas as I described.

razorrick1293 · 25th April 2012, 10:36 PM

i see, im looking forward to seeing this.

shanx · 17th May 2012, 03:52 AM

Hi Razorrick, hope the studies are going well.. whenever you are ready to start a new thread let me know. I need to get a few things out of the way first too.

razorrick1293 · 17th May 2012, 10:51 AM

Hi Shanx, I've got exams now, theyre all out of the way end of june, but im making a PCB for a pedal on friday, nothing too complicated but I'l use it to test how the eb91 clips.

shanx · 17th May 2012, 03:52 PM

That will be great, I had some parts on order that came in now so I will start looking at that soon.
Good luck on your exams.

razorrick1293 · 17th May 2012, 04:39 PM

ok good, thank you, i just need to get the eb91, as for the rest of the pedal we said make it all tube right? well i've decided to go the whole way with a 12at7 PP output. might make teting a bit easier too. a chasis has already been drilled out, ive got a transformer with a HT of about 220v, but ive got a 12-240 im considering putting in a more stompbox package at the end of it.

shanx · 17th May 2012, 05:55 PM

Nice, you could probably get a sweet 1 watt out of it. That would be great on a ''pedal'', because most tube based pedals are only preamp type distortion. This way, you get the whole amp distortion and can use it as a practice amp, or run the output through an attenuator into a bigger amp. . The 12 AT7 could also be paralleled with a common tail and run class A SE.

razorrick1293 · 17th May 2012, 06:10 PM

From what ive tried before, it peaks at about 2 watts in PP, i did try a parallel SE with 12AU7s but there was alot more hum, i would try it again though. and you probably wouldnt need alot of attenuation, at full output you only get about 3v at 4 ohms, so maybe -6dB would be fine into a 4 ohm dummy load.ive still got a 12k5 12v power tube i may try for low voltage power tube distortion, but thats another project.

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24th April 2012, 12:43 PM	#81
shanx diyAudio Member Join Date: Dec 2010 Location: Quebec	By the way razorrick, I went over to my friends place to show him some of the settups of the pedal I made for him, and he really liked the diode connected mosfets sound. It sounded quite smooth with their body diodes clipping, put a bit of the soft clipping in there too..sweet. His amp is tube preamp, with SS output. The LED/Ge diode works for my setup but there are quite a few other combos that are nice.

24th April 2012, 01:21 PM	#82
razorrick1293 diyAudio Member Join Date: Nov 2010 Location: England Hertfordshire	sounds interesting but wouldnt that just be clipping the same side of the wave after its been inverted?

25th April 2012, 02:31 PM	#83
shanx diyAudio Member Join Date: Dec 2010 Location: Quebec	yes in theory at least that is the way one would assume would work. but depending on the clip point at first stage,if it is slightly clipped at first stage, then brought to post clip after some filtering..if the post clip is a higher voltage threshhold, it imparts a different sound. That is the staging I hear on it when setup that way. more 3 dimensional sound. I will sketch up something, but it will follow the same sort of ideas as I described.

25th April 2012, 10:36 PM	#84
razorrick1293 diyAudio Member Join Date: Nov 2010 Location: England Hertfordshire	i see, im looking forward to seeing this.

17th May 2012, 03:52 AM	#85
shanx diyAudio Member Join Date: Dec 2010 Location: Quebec	Hi Razorrick, hope the studies are going well.. whenever you are ready to start a new thread let me know. I need to get a few things out of the way first too.

17th May 2012, 10:51 AM	#86
razorrick1293 diyAudio Member Join Date: Nov 2010 Location: England Hertfordshire	Hi Shanx, I've got exams now, theyre all out of the way end of june, but im making a PCB for a pedal on friday, nothing too complicated but I'l use it to test how the eb91 clips.

17th May 2012, 03:52 PM	#87
shanx diyAudio Member Join Date: Dec 2010 Location: Quebec	That will be great, I had some parts on order that came in now so I will start looking at that soon. Good luck on your exams.

17th May 2012, 04:39 PM	#88
razorrick1293 diyAudio Member Join Date: Nov 2010 Location: England Hertfordshire	ok good, thank you, i just need to get the eb91, as for the rest of the pedal we said make it all tube right? well i've decided to go the whole way with a 12at7 PP output. might make teting a bit easier too. a chasis has already been drilled out, ive got a transformer with a HT of about 220v, but ive got a 12-240 im considering putting in a more stompbox package at the end of it.

17th May 2012, 05:55 PM	#89
shanx diyAudio Member Join Date: Dec 2010 Location: Quebec	Nice, you could probably get a sweet 1 watt out of it. That would be great on a ''pedal'', because most tube based pedals are only preamp type distortion. This way, you get the whole amp distortion and can use it as a practice amp, or run the output through an attenuator into a bigger amp. . The 12 AT7 could also be paralleled with a common tail and run class A SE.

17th May 2012, 06:10 PM	#90
razorrick1293 diyAudio Member Join Date: Nov 2010 Location: England Hertfordshire	From what ive tried before, it peaks at about 2 watts in PP, i did try a parallel SE with 12AU7s but there was alot more hum, i would try it again though. and you probably wouldnt need alot of attenuation, at full output you only get about 3v at 4 ohms, so maybe -6dB would be fine into a 4 ohm dummy load.ive still got a 12k5 12v power tube i may try for low voltage power tube distortion, but thats another project.