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Topic: Bigsby Tone & Volume Pedal Pots |
Joe Burke
From:
Toronto, Canada
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Posted 15 Oct 2020 6:45 am |
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I have this great old Bigsby volume & tone pedal, but the pots are starting to go. I spray them with Deoxit, but that only lasts a couple of jams.
Does anyone know the values of these?
Maybe 250k for the tone and 500k for volume?
Thanks. |
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Stephen Cowell
From:
Round Rock, Texas, USA
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Posted 16 Oct 2020 10:40 pm
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Measure across the outside terminals with an ohmmeter and you'll get closer than we could. Probably about what you guessed.
_________________
New FB Page: Lap Steel Licks And Stuff: https://www.facebook.com/groups/195394851800329 |
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Joe Burke
From:
Toronto, Canada
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Posted 18 Oct 2020 3:47 am
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| Thanks Stephen. I’ll try this. |
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Mike Auman
From:
North Texas, USA
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Posted 18 Oct 2020 1:08 pm
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+1 on measuring the resistance. Found a couple of photos that may help, I'm seeing tone pot as 100k and volume as 500k. Not sure about the taper, though. Mike
_________________
Long-time guitar player, now wrestling with lap steel. |
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Landon Jarrel
From:
Space
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Posted 18 Oct 2020 8:35 pm
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The taper for the tone pot will be logarithmic - this produces a "doo wah" effect. For really dramatic and quick effect, use a linear pot. The volume pot will be logarithmic to ensure an even-sounding change in signal output.
Cool pedal!
Last edited by Landon Jarrel on 19 Oct 2020 2:42 pm; edited 1 time in total |
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Stephen Cowell
From:
Round Rock, Texas, USA
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Posted 19 Oct 2020 11:17 am
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| Landon Jarrel wrote: |
The taper for the tone pot will be logarithmic - this produces a "doo wah" effect. The volume pot will be linear to ensure an even change in signal output.
Cool pedal! |
Audio taper was created just to combat the situation you describe... linear taper pots don't work well for volume.
_________________
New FB Page: Lap Steel Licks And Stuff: https://www.facebook.com/groups/195394851800329 |
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Thomas Stone
From:
San Francisco
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Posted 19 Oct 2020 2:25 pm
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| You should ideally have the pots out of circuit when you make your measurements, otherwise you will be measuring some parallel combination of the two pots. |
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George Biner
From:
Los Angeles, CA
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Posted 20 Oct 2020 3:01 pm
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Preferably with one side of the pot disconnected, just turn it to halfway and if the resistance is half of the total, it's linear; if it's way off from half (like 1/3), it's log.
_________________
Guacamole Mafia - acoustic harmony duo
Electrical engineer / amp tech in West Los Angeles -- I fix Peaveys
"Now there is a snappy sounding instrument. That f****r really sings." - Jerry Garcia |
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