- Resistor Ronker
- Posts: 338
- Joined: 08 Mar 2009, 16:55
- my favorite amplifier: Vox Valvetronix Series
Super Hard On
Aenima/Torn's Peaker (2 in 1 box with toggle switch)
Valvecaster Deluxe (Boost before VC)
Proco Rat (Mod to power jack, and input cap changed)
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Just a quick question on using alternative values for things. We've all had those builds where we need to use substitute values. I've done ones where the substitutes have been really close. Things like 12k resistors replaced with 15k resistors, or 20nF caps replaced with 22nF caps. As i'm sure a lot of you will agree, a lot of the time, if the values are close enough, it won't really make much of a difference a lot of the time.
My question is, what if almost the entire board were substitutes? Obviously, the sound will be noticibly different. This may be tone, volume, fuzz amount etc etc, the list is endless. But, will it always still work provided the values are pretty close?
I'm just about to debug a Green Russian BMP build, but there's a lot of alternative values. Most are REALLY close, as described above. But there's a few i'm not sure about. The furthest one out in terms of resistors is a 470k replaced with a 600k, or a 2.2m replaced with a 3m. It should work really, right?
I'm so confused....
- Breadboard Brother
- Posts: 50
- Joined: 05 May 2009, 18:13
- my favorite amplifier: Kustom K 200 A-4 in red
kay fuzz, clark fuzz, ea tremelo, green ringer, tremelus lune, a few big muffs, fuzz face and factory, sft, woolly mamoth, a bunch of tonebenders and many more that need to be boxed
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- Transistor Tuner
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Metal Simplex, Fuzz Factory, two Fab Echos-modded, Noisy Cricket, Earth & Space Wah, TS-7-modded, passive xover/splitter box, opamp fuzz
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rocklander wrote:hairsplitting and semantics aren't exactly the same thing though.. we may need two contests for that.
- Diode Debunker
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Completed builds :
MXR MicroAmp in a volume pedal
TubeDriver (w/ NoS russian tube and big muff tone contol) + Phase 45 (w/ univibe cap ratio)
Dallas Rangemaster (w/ noisy OC75, negative ground)
SubCaster tube booster (w/ NoS russian tube, PtP)
Music From Outer Space SubCommander in progress
Crackle Not OK
Simple bass blender in a 1590A
Bazz Fuss with a photo-darlington
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For example, a 10k 10% resistor will more efficiently replace a 12k if it's close to the max value (i.e. 11k) rather than the min.
[Slightly off topic : i remind an experienced engineer saying that back in the day, a 10% resistor was always more than 5% off the specified value, as these were factory-sorted ... nowdays i'll expect a nice gaussian curve.]
Anyway, for a Big Muff it doesn't matter much, as there were quite a lot of variation in the official schematic along the years ...