Announcement
Collapse
No announcement yet.
Search Result
Collapse
18 results in 0.0054 seconds.
Keywords
Members
Tags
-
thanks guys. I couldnt find a schematic as this is one of the more obscure MXR pedals, the predecessor to the microamp I think. I got a 47pF cap - the closest...
-
Help identifying a capacitor
Hi,
Does anyone know what the value of this cap might be? It's a small disc with 50 on it, no decimal or anything else. It's from an old...
-
both caps look original - c11 says 103; c12 is hard to see but it looks like 681.
I uploaded a video that shows what happens when I turn the...
Leave a comment:
-
yes, I was looking at the chip from the backside rather than the front so all my numbers are reversed.
All the connections coming from r28...
Leave a comment:
-
I've also checked the board all over for other damage. the only thing I keep wondering about is a mark where the orig 'modder' snipped the R28. Looks like...
Leave a comment:
-
ok here's what I found but one question first -
should the voltage of all three prongs for the rate pot change? I notice that only two of...
Leave a comment:
-
Hey thanks for the tip - I checked the voltage and it looks like the oscillator and TL062 chip are okay. It must be a short or bad part somewhere further...
Leave a comment:
-
yeah it definately does something - but the squeal is still horrible.
Leave a comment:
-
hey thanks for the tip. I tried what you suggest as turning the rate knob does change the sound of the squeal slightly.
Rotating that r27...
Leave a comment:
-
Yeah I figure there's a short somewhere or someting fried when he tried mod it. I see no other signs of replaced parts and I'm not skilled enough to test...
Leave a comment:
-
I've tried a 24k (original) and with a jumper. Both cause the horrible screeching.
Leave a comment:
-
my apologies - you are right, I get the slight swishing with no R28 resistor in. The proper R22 is in there.
I have a cheap multimeter but...
Leave a comment:
-
With no R22 resistor in I do get a slightly boosted tone with a very faint swishing effect.
Leave a comment:
-
okay - tired reinstalling proper R22 resisotr and same problem. Anyone have any ideas or suggestions on what to test with multimeter?
Leave a comment:
-
nice. be sure to use a socket for the transistors for easy testing of different combinations. I found quite a lot of tonal variations with ones that look...
Leave a comment:
-
yeah I forgot to mention I tried that and got the squeal. I havent tried reinstalling a 2.1 resistor yet though.
Leave a comment:
-
if it helps, I also notice that the original "modder" replaced the R22 2.1m ohm resistor with a 1.2 m ohms one.
here's a schematic:...
Leave a comment:
-
Help with squealing MXR Phase 90
Hi all,
I bought a reissue Phase 90 that wasnt working (the guy sad he botched the r28 mod and couldnt be bothered to fix it).
...
Leave a comment: