The circuit sounds pretty good...except when I connect lug1 to ground from the Fuzz Knob. I am really perplexed. I've tried two different pots with the same behavior. Any ideas. Circuit seems to run great other wise.
I have lug 2 going to the negative side of the 22uf cap which goes to ground.
Lug 3 goes to the emitter of Q2 and 100k resistor.
(http://tapatalk.imageshack.com/v2/15/01/09/079fd44fb78c52423f52e4df29a768fa.jpg)
Here's the vero I'm using. I've also compared it against Sabrotones vero
(http://tapatalk.imageshack.com/v2/15/01/09/5a040b379067f5137af35abbaa2c3f28.jpg)
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Just realized I didn't describe the issue! The signal cuts out completely when I connect Fuzz 1 to ground.
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Turns out it was a transistor issue. Bought the 'Continental' set from small bear which they labeled the measured hfe and leak. I built the transistor tester from GeoFx and they measured between 10 and 20 hfe.
I had purchased some bulk trannies and put in ones I measured to be within spec. Now it screams!!
With all the great reports about Smallbear transistors I'd have to say the made an honest mistake.
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I'm glad you got it going PhiloB. Was it the OC77's that were out of spec? Steve.
Yes. Is this THE Steve? ;)
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LOL....no....I wish. I could use the parts. ;)
LOL. I talked with one of his guys prior to receiving shipment because of an error I made when ordering and the guy was super helpful. I've got no beef with Smallbear. I guess the moral of the story is build yourself a transistor tester. Don't take others word for it (cause everybody makes mistakes) if you want to avoid wasted time and headaches.
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I need to build this tester, too. I just got a ----load of germ trannies and will need to measure all of them.
Where'd you buy yours from Antknee?
I'm looking for a good source of unsorted bulk. Id like to do this one time in my pedal building 'career'. Buy bulk, measure, sort and catalog for future builds. I have several Ge projects if like to now that I've had a taste. I'm blown away with what you can do with just the volume knob between 7-10 on the guitar. It is killer!
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Quote from: PhiloB on January 12, 2015, 05:28:54 PM
Where'd you buy yours from Antknee?
I'm looking for a good source of unsorted bulk. Id like to do this one time in my pedal building 'career'. Buy bulk, measure, sort and catalog for future builds. I have several Ge projects if like to now that I've had a taste. I'm blown away with what you can do with just the volume knob between 7-10 on the guitar. It is killer!
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I got mine from a guy in Bulgaria.
http://www.ebay.com/usr/bg2014-manue (http://www.ebay.com/usr/bg2014-manue)
He is known here on the forum. He always tend to send extra parts to fill the space in his packaging, pretty cool! Last time I got like 100 capacitors of various values with my germs.
see this thread:
http://www.madbeanpedals.com/forum/index.php?topic=19240.0 (http://www.madbeanpedals.com/forum/index.php?topic=19240.0)
Quote from: PhiloB on January 12, 2015, 05:45:01 AM
Turns out it was a transistor issue. Bought the 'Continental' set from small bear which they labeled the measured hfe and leak. I built the transistor tester from GeoFx and they measured between 10 and 20 hfe.
I had purchased some bulk trannies and put in ones I measured to be within spec. Now it screams!!
With all the great reports about Smallbear transistors I'd have to say the made an honest mistake.
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Hmmmm.
These sound very, very close to the hfe you'd likely get if you had the transistors backwards. Did you try flipping them 180 degrees?
I'm pretty sure i did Jon. There is also a red dot on the can which indicates the emitter on the O77's if I'm not mistaken.
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Just rechecked and they measured 3 and 2 hfe
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