For pot experts

Tommy Roten · Post by **Tommy Roten** » 24 Jul 2005 8:55 am

He he by the way, I'm talking about volum pedal pots (goodrich). I found some cheap pots on the net, and the info I found was this: LOG potmeter, RV4SAYSD504C mil code, 1.2 cm high, 2.8 cm diameter. I know the physical size is right, but what about the code? And whats the difference between Log and Audio taper? And yeah they are 500k.

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Franklin D-10, MSA D-10, Goodrich volped, Mesa Boogie Quad preamp, ProfexII, Mosvalve 1500, 2xEminence 12", Nashville 400,
www.tommy-steel.com
pertrot@frisurf.no

John Tipka · Post by **John Tipka** » 24 Jul 2005 9:11 am

Steve Hinson · Post by **Steve Hinson** » 24 Jul 2005 9:45 am

Pot experts?

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http://home.comcast.net/~stevehinson

Graham Lathrop · Post by **Graham Lathrop** » 24 Jul 2005 11:37 am

a[This message was edited by Graham Lathrop on 11 June 2006 at 09:54 AM.]

Earnest Bovine · Post by **Earnest Bovine** » 24 Jul 2005 11:45 am

I think log taper and audio taper are the same. They both work fine.
Nobody knows how long pots will last these days, so I say if they cost less than $10, but them.

Jim Florence · Post by **Jim Florence** » 24 Jul 2005 2:46 pm

Log and Audio tapers are not the same. They will both work, but audio taper is especially designed for the performance curve of the human ear. Most people would not be happy with a foot pedal with a Log tapered pot.

Bill Bosler · Post by **Bill Bosler** » 24 Jul 2005 6:39 pm

I always used log taper pots. You want the most gain in volume in the shortest amount of pedal travel.

Dave Grafe · Post by **Dave Grafe** » 24 Jul 2005 7:34 pm

had to give it up - it made me sound real bad (to other people, at least).

Tommy Roten · Post by **Tommy Roten** » 25 Jul 2005 1:14 am

And the code on it is RV4SAYSD504C. What does that tell You?

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Franklin D-10, MSA D-10, Goodrich volped, Mesa Boogie Quad preamp, ProfexII, Mosvalve 1500, 2xEminence 12", Nashville 400,
www.tommy-steel.com
pertrot@frisurf.no

Charlie McDonald · Post by **Charlie McDonald** » 25 Jul 2005 4:35 am

I am unclear about how the Fletcher-Munson curves relates to log or audio pots. I see how they relate to loudness contours in amps. What is the conclusion that can be drawn with regards to log or audio tapers?
Just curious.

Karlis Abolins · Post by **Karlis Abolins** » 25 Jul 2005 6:00 am

Tommy, here is the rundown on your pot

RV4SAYSD504C

RV4 = MIL style RV4
S = panel & shaft steel Bushing
A = without switch
Y = as per MIL-R-94 temperature & moisture characteristics
S = slotted Shaft Style
D = 7/8" Shaft Length
504 = Total resistance value in Ohms: first 2 digits significant, third digit = number of zeroes (500000 = 500k)
C = logarithmic 10% Taper & Tolerance

web site is http://www.precisionelectronics.com

Karlis[This message was edited by Karlis Abolins on 25 July 2005 at 12:48 PM.]

Ray Minich · Post by **Ray Minich** » 25 Jul 2005 6:37 am

Suddenly I'm hungry....

Dave Grafe · Post by **Dave Grafe** » 25 Jul 2005 11:32 am

Charlie, I think the reference is in the rate at which humans perceive changes in volume, which comforms to neither linear or logrithmic curves.