I would suggest checking the solder joints - are they clean? I'm hoping someone can point me to the right manufacturer. Again dating does not seem to be possible with these pots. It ensures that on a volume control marked 0 to 10, for example, a setting of 5 sounds subjectively half as loud as a setting of 10. I suppose the '4' after the first two digits has a coded factor of 10X???? Actually, it's not a source code but is a manufacturers code for all National, Valco, Supro products. Usually on the back, as shown in the picture here, or sometimes on the side.
The numbers on the pots read 250K 923 Does anyone know what 923 says about the date? Electronic symbol for pre-set potentiometer Multiturn potentiometers are also operated by rotating a shaft, but by several turns rather than less than a full turn. This is especially the case for guitars that were only ever shipped in tiny numbers. I simply had never seen '254B' or '504B' codes. Tortoise shell pot cover included along with mounting screws. The only point of ingress for contamination is the narrow space between the shaft and the housing it rotates in. Conversely, guitars were also built, but not wired and shipped immediately, resulting in newer pots in older guitars. Or would it be 105???? There's a good guide at that includes the following table: Being from an electronics supplier rather than from an old piece of equipment I'd say the A is logarithmic and the B is linear, but it may also vary by region.
Codes have the following configuration mmmyww or mmmyyww The first three digits mmm indicate the maker of the pot. The suffix code letter identifies the quality of the speaker. I'm not trying to find a replacement for the pot that I have; I'm trying to buy a different pot that shares some of the same mechanical characteristics. Is that what is going on there? Another is that the sensor requires occasional calibration to match touch location to the underlying display. Various components for amplifiers and makes Mallary Electronic Products 251- Ohmite Mfg. Multiturn potentiometers, both user-accessible and preset, allow finer adjustments; rotation through the same angle changes the setting by typically a tenth as much as for a simple rotary potentiometer. Potentiometers are commonly used to control electrical devices such as volume controls on audio equipment.
Make sure you are looking at the correct system, sometimes a code reader will convert to decimal our normal 0-10 system and it may be confusing. Our sensor innovations have helped to streamline and optimize the daily processes of customers across a wide range of industries. 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. Contamination can potentially enter anywhere along the slot the slider moves in, making effective sealing more difficult and compromising long-term reliability. I'm not trying to find a replacement for the pot that I have; I'm trying to buy a different pot that shares some of the same mechanical characteristics. The repeat accuracy is typically between 0.
If you mean vintage guitars, there are numbers on the pots that can be dated if you can read them. Check out my other items for other vintage guitar and accessory items -- selling a bunch of stuff! The source-date code found on pots and speakers gives the manufacturer and date roughly when the components were made. . I was familiar with the decoding system. I am sure that you can find something suitable off the shelf. A logarithmic potentiometer can also be simulated not very accurately with a linear one and an external resistor. In manufacturing it is important to have part numbers for the builders of the guitars or amplifiers.
Spectra Symbol has left its particular mark on the industry by engineering linear position sensors that are smaller and lighter-weight than those of other linear potentiometer manufacturers. Note: A series of numbers greater than 53 can not be a week dating code as it would be longer than the weeks in a year. The source-date code will signify the earliest possible date that the instrument or amp could have been made. Gathering the wheel rotation data, and comparing it is accurate enough to identify differences in tyre tread wear, but its main use was as part of a tyre pressure monitoring system. Potentiometers are often used as volume controls and are available in Audio or Linear tapers. They are also available in different types such as sliding and rotary potentiometers and are sometimes referred to as trimmers, trimpots, or variable resistors. Hi All, I've never been an expert on pot codes, but now find myself on the search for some replacement parts for old guitars.
These results are derived from various public and private data sources. And finally, what exactly do these numerical codes represent? Well I'm not one to leave you out in the informational cold, so here's something that I use quite often in dating amplifiers and electric guitars. I don't see how it will help identify the mfr, but anyway: 12mm pot; 9Mx. The linear versions can range from 9 mm to 1000 mm in length and the rotary versions range from 0° to multiple full turns, with each having a height of 0. Membrane potentiometers can be used for position sensing.
Pots in an older guitar may have been replaced, and this should be considered, especially if the date suggested does not fit with other features of the guitar. If the last 2 numbers are higher than 52, it is not a pot code, but is probably a part number. The two resistive tracks overlap at approximately 50% of the potentiometer rotation; this gives a stepwise logarithmic taper. You can look up Gibson potentiometers by their part number in the on this site. I am certain that the maker of the equipment that this pot came from did not purchase more than 5,000 or so pots - not 100,000 by any means. In this case, the speaker is made by Rola 285 in the 9th week of 1957 709. Assuming you know the resistance and can guess from its function whether it is linear or log law, the best you can do is to look through all the various items you can find on the web from parts suppliers and see if you can see something similar.
So reading them will require opening control cavities, removing scratchplates, or in the case of a semi acoustic, removing the pots entirely. Through digital input signals, the resistance between two terminals can be adjusted, just as in an analog potentiometer. A motor-driven potentiometer may be used as a , using a non-linear resistance card to supply approximations to trigonometric functions. What's more, guitar companies sometimes took a very long time to use the potentiometer in question, and they may be considerably older than the guitar itself. Many also put a country of production.
When a percentage is referenced with a non-linear taper, it relates to the resistance value at the midpoint of the shaft rotation. In these cases all pots are often from the same batch, with identical codes. Makes various hookup wire and cable. Please view our large selection of potentiometers below. The code used also varies between different manufacturers.