Need help with guitar tube pedal schematic. - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Instruments and Amps Everything that makes music, Especially including instrument amps.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 22nd February 2009, 08:45 PM   #1
diyAudio Member
Join Date: Feb 2009
Default Need help with guitar tube pedal schematic.

I have some knowledge of electronics and in the past I've built 2 solid state guitar pedals from existing schematics.

I've been looking around the web for a low voltage tube pedal schematic but I ended up putting some ideas together and drawing a schematic myself (highly influenced by other schematics).
Could someone please have a look at the schematic and tell me if it will work and what needs to be changed?
(I'm a first-timer with tubes)

Note: As the file was too big to upload, I made a website to post the schenatic.

Thank you
  Reply With Quote
Old 22nd February 2009, 09:48 PM   #2
diyAudio Member
Join Date: May 2005
Location: Stittsville, Ontario, Canada
I dont want to sound totally nevative or anything, but there seems to be more and more of these circuits using 12 volt supplies and tubes posted here lately. Is this some kind of trend or cult or something ? I just dont understand it.

Anyway, with the resistance values shown your tubes are going to be drawing in the microamps, if at all. The plate resistances need to be in the 10's of K ohms, the cathode resistor maybe ohms. With hundreds of volts of power supply 100k plate and 1K cathode resistor make sense.

The 1Meg resistor to ground should be on the other side of the coupling capacitor, and should probably be lower in value.

I know the circuit is for distortion and not accurate amplification, but still you cant totally cut off the tube otherwise it is just a glorified capacitor of a few pF.
Robert McLean
  Reply With Quote
Old 22nd February 2009, 10:13 PM   #3
diyAudio Member
nigelwright7557's Avatar
Join Date: Apr 2008
Location: Carlisle, England
I looked at the distortion cct, if your gonna go for diodes then a simple op-amp fuzz box would do the trick.

You can also get hold of soft limiter ccts that do as good a job as a valve but for much less money.
Murton-Pike Systems PCBCAD51 pcb design software.
  Reply With Quote
Old 23rd February 2009, 02:21 PM   #4
diyAudio Member
Join Date: Feb 2009
Thanks for the advise. I posted the changed schematic on the website:

Hope its correct now and ready to build.

Please reply if you have any further advise.
  Reply With Quote
Old 23rd February 2009, 09:13 PM   #5
diyAudio Member
Join Date: Nov 2007
Location: Dallas
I think your circuit may need two separate plate resistors.

Else the currents are forced equal and opposite, and not
much happens in the way of a voltage swing at the top.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help on DIY Wireless Guitar Pedal flava Parts 1 18th June 2009 12:06 AM
DIY Wireless Guitar Pedal - Help....... flava Instruments and Amps 1 31st May 2009 04:14 PM
Curious how to put a volume pedal between tube guitar amp head and speakers of same. nova62400 Instruments and Amps 11 30th May 2006 09:03 PM
looking for a new spin on guitar fx pedal psu rockstudio Instruments and Amps 2 7th April 2006 03:29 PM
Guitar Pedal Glowin Plates Instruments and Amps 7 9th March 2005 05:16 AM

New To Site? Need Help?

All times are GMT. The time now is 04:03 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2