Howdy y'all! I've danced around this subjecty a few times but never did a full-on blog about it so here goes! There is a little confusion out there, and even some downright wrong info, so listen up A pot simply inserts a variable amount of resistance into a circuit, dead simple! There are three lugs on the typical pot with which to solder your leads to, the center lug is the "wiper" arm which travels towards or away from the lugs on each side, the closer it is to a side lug, the less resistance there will be; inversely the further the wiper is away from one of the side lugs, the more resistance there will be. Make sense? If not, re-read this paragraph and check out this diagram until it is crystal clear
Dating volume pots
And so, the 3 ohms or so of resistance in a fully "up" K pot results in a brighter tone than the 7 ohms of a K pot.
The Take-Away : K pots are generally used as volume controls on single-coil guitars like Strats and Teles where you need to keep the already bright pickups from getting too bright; K pots are generally preferred on the darker humbucker designs to keep them from getting too dark.
A side-note: 25K pots are usually used with "active" pickups which contain a built-in pre-amplifier which converts the high impedance of the pickups K-ohms to low impedance ohms ; if you were to replace the pickups in a standard guitar with active pickups and failed to also replace the pots with 25K If you want to really make your Tele bright, switch to K pots Oh, and if you like to live on the fringe Originally, all pots were what we refer to a linear with a smooth run up to full value, meaning a K pot would rea ohms K of resistance when turned all the way down, the afore mentioned ohms when turned all the way up, and at the half-way point it would provide about K of resistance From an electrical perspective, this makes perfect sense, problem is our ears do not hear on a linear scale, they hear on a logarithmic scale!
A super-quick refresher here: linear is 1,2,3,4,5 and so on whereas logarithmic is 1, 10, and so on.
The Take-Away: K pots are generally used as volume controls on single-coil guitars like Strats and Teles where you need to keep the already bright pickups from getting too bright; K pots are generally preferred on the darker humbucker designs to keep them from getting too dark. A side-note: 25K pots are usually used with "active" pickups. Low blood volume POTS: Reduced blood volume can lead to POTS. Low blood volume can cause similar symptoms that may overlap in neuropathic and hyperadrenergic POTS. Who is at risk for POTS? The majority of POTS patients are women ages years old. About , people suffer from POTS in the United States. On this guitar, the top two are volume and tone for the neck pickup and the bottom two are volume and tone for the bridge pickup. There are a few sets of codes on the back of potentiometers. Look at the one with the least amount of solder on the back, bottom right. The "CBA" isn't helpful for our dating .
Big difference, right! And so, in a perfect world, our guitar volume pots would all be log taper also called audio taper!
For that dating volume pots congratulate, what
Notice how the real world audio-taper pots have a couple of elbows where the taper shifts rather dramatically, as opposed to a nice smooth logarithmic movement. You see, all the manufacturers balance cost to consumers with performance, and they are not all the same! The source-date code found on pots and speakers gives the manufacturer and date roughly when the components were made.
It may have been some time before the part was installed at the factory, but it still provides a good approximation of when the gear was made.
The source-date code will signify the earliest possible date that the instrument or amp could have been made.
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This isn't going to be exact, but it will give you a "ball-park" age. And remember, even the dates indicated by the pots aren't that exact. For example, if you buy a brand new CTS pot today, they are dated a month or two in advance!
It's worth mentioning since a lot of people rely on pot dates. That said, it's not uncommon for pot manufacturers to post date pots anywhere from a few weeks to as much as 18 months.
Stamped on every potentiometer (volume and tone pots) is a six- or seven-digit source code that tells who made the pot, as well as the week and the year. The source dating code is an element of standardization that is administered by the Electronics Industries Alliance (EIA). The EIA assigns. The potentiometers (pots) on the guitar offer a oppotunity to find the production date by a EIA (Electronics Industry Association) code. Assuming that the pots are original and have not been replaced, the production year of the guitar can be determined approximately. The EIA code on pots indicates the manufacturer and date when they are made. Dating volume pots - Is the number one destination for online dating with more dates than any other dating or personals site. Find single woman in the US with rapport. Looking for romance in all the wrong places? Now, try the right place. Join the leader in online dating services and find a .
The standard today is no more than 18 months, but back in the s and s, who knows? Some large parts distributors would even return parts if the date code was "expired" and want "fresh" parts in return. This seems silly, as we're talking about electronic parts not eggs.
But if you think about it, parts like electrolytic cacpacitors, this could be an issue. Then the parts maker like CTS would have to eat the returned inventory, or sell it off to someone that didn't care about date codes, and probably at a discounted amount.
What I'm saying is that pot and capacitory date codes are not a reliable indicator of guitar build dates.
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Though they are one piece of the puzzle and something to consider, don't put too much faith into a pot date. The source-date codes are under the framework of the "Electronic Industries Association", which is a non-profit organization representing the manufacturers of electronic parts.
It can be stamped or marked on any product to identify the production source vendor and date of manufacturer. Source-date codes have been published by the EIA since But I have seen them used on Stackpole pots on electric National guitars as early as The first time date-source codes were published wasso I guess you could see them as early as the late 's.
Most Fenders from to have dated CTS pots.
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On popular Fender models, the pot date can be very close to the actual date of the instrument. On less popular Fender instruments, such as LapSteels, pots can be as much as two years earlier than the actual date of the instrument. Gibson didn't start using pots with source-date codes till or Of course this all assumes the pot or speaker is original.
You have to make that call. I would suggest checking the solder joints - are they clean? Are the wires of the right era cloth insulation for older stuff? If so, you can check the pot or speaker for the source-date code, and determine an approximate age from that.
How the Source-Date Code Works. The source-date code on a pot is a 6 or 7 digit code impressed into the casing of the potentiometer. For speakers this code can be 5, 6, 7 or 8 digits long, and it's ink-stamped or paint-stamped on the "bell housing" of the speaker.
In either case, the code works the same. The first 3 digits on a pot, or the first 2, 3 or 4 digits on a speaker are the source or manufacturer code. The remaining 3 or 4 digits are the date code.
Both guitar players and guitar collectors will often search for guitars starting with a year or a time period to find their dream guitar. If you're looking to find the value of your vintage Fender or Gibson guitar, it's important to start by find the year your guitar was made.
Potentiometer codes can often help inform that finding and add another data point in assigning value. Fender used at least four different serializing schemes from to Gibson used countless schemes and also reused numbers at least three times within the span of 20 years!
The best way to assign a year of manufacture to a guitar is to date each part individually then see how the guitar as a whole lines up to established dates. The potentiometers, or variable resistors that are turned to vary the volume or tone, have codes on the back that indicate the week and year they were manufactured. Let's look at the control cavity of this Gibson Melody Maker D.
Here we can see the braided leads coming from the pickups, an output jack, two orange ceramic disk capacitors, and four round metallic things with codes on the back. The round metallic things are called potentiometers.
On this guitar, the top two are volume and tone for the neck pickup and the bottom two are volume and tone for the bridge pickup. There are a few sets of codes on the back of potentiometers.
Pots used by Fender. The middle one is a CTS pot (Chicago Telephone Supply, manufacturer #) from the 30th week of The pots on the left and right are Stackpole pots (manufacture #). Note the different position of the markings, even on pots from the same maker. Left: The source-date code on a speaker. In this case, the. Dec 21, Basically, dating the pots only confirms the earliest time the guitar could have been produced. Since your guitar has pots dating from and they appear to be original, we know it was produced in or later. Now comes the identifying part. Your guitar has cosmetic features and specifications similar to a Les Paul Standard. vintage / 62 cts audio taper 1 meg pot for vintage amps almost all fenders use 1 meg audio for volume controls This pot is unused the shaft was cut to appropriate length and it was disassembled, inspected, cleaned, lubed and reassembled. It is like a new pot but it is from it has a side stamped date code of meaning that it.
Look at the one with the least amount of solder on the back, bottom right. The "CBA" isn't helpful for our dating purposes.