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Discussion Forum for Mesa Boogie Products
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PostPosted: Sat Sep 29, 2018 8:35 pm 
Bottle Rocket

Joined: Mon Jan 12, 2015 8:47 pm
Posts: 5
Hey there,

I've found myself in need of switching between R1 and R2 again - I haven't needed to in years. So, I'm building another footswitch for the R1/R2 for my Blue Stripe (it has the R2 vol mod). I've built and fixed a few pedals, changed pots on guitars, etc. but I'm pretty much an electronics noob. So the issue I'm having is, I'm using a green LED instead of red (it's what I have on hand plus it'll be different than the lead/rhythm switch) so what resistor value do I use in series with the green LED? My lead/rhythm switch has a 3.3k for its red LED but that ain't cuttin' it with the green. Thanks for any insight.


PostPosted: Wed Oct 10, 2018 3:32 am 
Mark I

Joined: Wed Jun 15, 2016 1:18 am
Posts: 28
Any resistor value from 1.5k up is fine as a current limiting resistor for an LED.
The thing is that LEDs range in value of brightness as measured in Lumens.
What you need to do is try different value resistors until you get it to a similar brightness to your Red one.

Did you know you can shave resistors with a file to get exact resistances? Crazy (and fiddly) but true. Cover the filed part with nail polish.

Blue Stripe MKIII head
MK IVb long head
Vox AC30TB
Mesa cabs

Gibson, Fender, PRS and vintage EHX.

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