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|3rd February 2008, 10:49 AM||#1|
Join Date: Feb 2008
Help Needed!! Tubescreamer build; Pot noise problems
Just getting together a Tubescreamer from the tonepad pcb. We can't easily get the exact parts here in the UK, so a few substitutions;
one of the 510k 's is a 470k
0.027uf is a o.022
0.22uf's are normal, not tant
51pf is a 47pf
1uf np s are both standard (enormous!) orange jobs
tone pot is 22k not 20k
The problem- low effect output, and when I try to turn up any of the pots, I get a screaching sound- not the 'screaming' I was hoping for!
9v = 9.33
1 = 4.65
3 = 4.56
8=9.33 which sounds ok?
From using a probe Ican detect that the screaching is coming from the pots, esp the level one, and also the second 1uf capacitor
Please does anyone have any ideas?
Are my substituted componants causing problems? If you hadn't guessed, I'm a bit new to this game, and it's all a bit trial and error- any thoughts much appreciated!!
|3rd February 2008, 07:28 PM||#4|
It sounds like the circuit is oscillating. The original TS had a 100mf from the +supply to ground to keep this from happening. I would try adding one.
How do I put the smoke back in this thing?
|10th February 2008, 09:43 PM||#6|
Join Date: Jul 2005
Location: North Derbyshire
I would say that's an essential component, it's asking for trouble atempting to leave it out.
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