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Old 7th August 2012, 11:28 AM   #11
SBD is offline SBD
diyAudio Member
Join Date: Jul 2012
First, I'll try and disconnect the connection between the heater supply ground and the High voltage supply ground (currently tied together) - Maybe ground loops.
Mains voltage earth is currently tied to both heater supply and HV supply .

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Old 8th August 2012, 07:07 AM   #12
diyAudio Member
Join Date: May 2010
Location: Hawkes Bay
I don't see any smoothing in your heater supply. You appear to have a very large reservoir cap but no subsequent smoothing filter. As it stands I reckon you will get a sawtooth waveform (4 volts peak to peak riding on the DC component) which will be noisier than 6.3 volts AC. Hope I'm wrong.

Last edited by djgibson51; 8th August 2012 at 07:09 AM. Reason: Clarity
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Old 23rd April 2015, 09:58 AM   #13
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Join Date: Sep 2014
Just curious. Did this circuit go anywhere from here? I got really interested on the concept and would like to give it a try in some point if the circuit was verified. Cheers!
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Old 23rd April 2015, 01:07 PM   #14
SBD is offline SBD
diyAudio Member
Join Date: Jul 2012
Yes, the circuit was built and tested. Fuzz effect was very "round", even at full throttle.
For some reason my friend who is a heavy metal player really liked the sound, I thought it needed at least one more gain stage to give the required headroom I like in an effect.
I changed the last stage from a follower to CC for the extra gain I thought needed. It did help, but for some reason I think I would have liked a bit more.
I did have some hum noise, but did not get into trying to insulate the problem.

I will post a picture of the built circuit later on today.
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Old 23rd April 2015, 01:10 PM   #15
diyAudio Member
Join Date: Sep 2014
Originally Posted by SBD View Post
I will post a picture of the built circuit later on today.
Thanks alot! Ive been getting more and more into tube circuits recently, but I would like to start from a bit less demanding and especially try out some pedal circuits.
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Old 23rd April 2015, 01:32 PM   #16
SBD is offline SBD
diyAudio Member
Join Date: Jul 2012
Here are some pictures of the effect proto board... It's somewhat dusty, so you know when was the last time a played with it




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