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Resistor Value Hack
- Thread starter Cybercow
- Start date
Harry Klippton
Well-known member
Hmmm maybe it would be fun to not seal the cut and let the pedal do what it wants as humidity affects it
KR Sound
Well-known member
Who can… resist that?
Bricksnbeatles
Member known well
I actually have a series of sound installation pieces planned to do essentially that, just by different means
Harry Klippton
Well-known member
I almost tagged you when I posted thatI actually have a series of sound installation pieces planned to do essentially that, just by different means
Kroars
Well-known member
Very interesting. I always preferred the ol’ scrape off the color codes and paint your own to match preferred resistance
peccary
Well-known member
This man mojos.
Alan W
Well-known member
You can go pretty deep into resistors. Vishay has “naked foil resistors” that cost in the low $30s each a decade ago, when I used a few in a project. Caddock has something similar. The main advantages are in low self noise and low capacitance. (These were ~ 1/2 watt resistors; I think they made larger ones, that got quite a bit more expensive.)
Erik S
Well-known member
Geez! I thought I was fancy spending the extra $.003 for the metal film ones.
JTEX
Well-known member
What resistor can possibly be so critical, in a guitar pedal context, that it can't be found, closely enough, in the widely available, el-cheapo, 1%/E96 series? 
And who still uses carbon resistors? (asking for a friend who has a vintage, B&W, all-tube, standard-def, CRT TV he's trying to sell to someone like that).
And who still uses carbon resistors? (asking for a friend who has a vintage, B&W, all-tube, standard-def, CRT TV he's trying to sell to someone like that).
Cybercow
Well-known member
I was thinking such a hack might be useful for getting the precise value used in testing Ge BJTs for gain and leakage ala the the Keen Germanium Transistor Testor which calls for a 2K472 value resistor.What resistor can possibly be so critical, in a guitar pedal context, that it can't be found, closely enough, in the widely available, el-cheapo, 1%/E96 series?
And who still uses carbon resistors? (asking for a friend who has a vintage, B&W, all-tube, standard-def, CRT TV he's trying to sell to someone like that).
JTEX
Well-known member
You made me look it up. What about the meter's input impedance? Assuming it's as high as 1Meg, that would already turn the 2.472k resistor into more like 2.466k.
JTEX
Well-known member
Make a blow hole on the pedal and blow on the resistor for modulation
Passinwind
Well-known member
A buddy of mine worked as a tech in the precision resistor business a zillion years ago, mostly for telecom and miltary applications. He would hand trim metal film resistor sets frequently, using a few different methods. A Dremel tool and epoxy was often involved, but for more critical applications they had some kind of helical grinder, which ported to laser trimming at some point.
My personal experience was mostly with being given thousands of out of spec but very closely matched pieces, sometimes in nice neat multiples of values as well. Resistors with 0.1% or better tolerance were not common back then, and definitely not for small money.
