Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

Problem with sweet thing

8/1/2000 12:33 AM
Problem with sweet thing
Ok when i crank the Drive pot on it i get a squeal that changes pitch as i turn it up.  
It only goes away when the drive know is turned down very low.  
Any help?  
Morgan miller
8/1/2000 4:17 AM
Ed Guidry

the sweet thing has a lot of gain. Make sure your input and output wires are short and away from each other, that includes the wires to the switch.  
You may want to check Doug's new mods to the pedal, he lists a way to decrease the oscillations by putting a small cap between r14 and r15 to ground, because his mods actually increases the overall gain to his pedal.
Book Of The Day The Ultimate Tone, Volume III by Kevin O'Connor
Have you ever wondered if there is a better way to build a Bassman, Champ, Plexi, an 800, AC-30, Bulldog or Portaflex? Or you wanted to build an SVT with off-the-shelf parts? How about a master-volume amp that doesn’t change tone with the master setting? Everything you need to know is right here, including: proper grounding techniques, wiring methods, and mechanical considerations. Eighteen chapters cover the “iconic” amps everyone knows and loves, with schematics and layouts for each, along with the technical history of the product. Eyelet-board and chassis-mounted tube socket construction is used throughout, for easy servicing and modding. TUT3 is very accessible even if you cannot fully read a schematic and is a "must have" if you are going to build an amp for your self.

Note: The Ampage Archive is an Amazon Associate site. A small commission is paid to the site owner on any qualified purchase made after clicking an associate link such as the one above.
8/2/2000 12:37 PM

Oscillation has been an ongoing issue with this pedal. Aron says he has corrected all the osc problems with his Booster2.5's by tweaking his wiring-making sure the input and output wires are as far away from each other and as short as possible.  
If that doesn't work, try the capacitor trick on my site:  
Scroll down to the "new & improved" Sweet Thing and check the note on the schematic. Putting a cap to ground in front of the follower seems to help.  
   Page 1 of 1