![]() Although many others were used, these are by far the most important, as they were widely used by the likes of Gibson, Fender, Guild and Epiphone. American pot manufacturers had their own numerical EIA (Electronic Industries Alliance) codes, for example 134 = Centralab, 137 = CTS and 304 = Stackpole. There are very many electronic companies worldwide producing potentiometers, but most American vintage guitars of the 20th Century used pots by just a few manufacturers. You can look up Gibson potentiometers by their part number in the Gibson pot index on this site. Many pots do not have part numbers, but the larger guitar manufacturers did list pots by part number in their spare parts manuals. Once decoded, the writing on the back or sides can be very informative in dating your guitar Part numbers ![]() But read on, dating a vintage guitar with pot codes is sometimes more reliable than dating with serial numbers!Īn early 1960s pot from a Gibson guitar. There are many exceptions and variations to the general rules described below, some of which are highlighted in the examples at the end. Finding them is not always easy this is obviously not something for the faint-hearted, but once performed a few times, nowhere near as daunting as it might at first seem. Codes can be faded, worn, obscured by solder and other components, or simply very small. So reading them will require opening control cavities, removing scratchplates, or in the case of a semi acoustic, removing the pots entirely. So where are these codes? Normally they are stamped or inked onto the back or sides of the pot. Many pots don't carry all of this information, but the better quality guitars produced in America usually do. Better quality pots are often stamped with a number of codes typically part numbers, date of production, manufacturers codes and resistance values. The pots, or potentiometers to give their full name, are the variable resistors that control volume and tone. Really, just reducing the power supply hum would make me happy.If you've been reading articles about dating a vintage guitar, you may well have come across mention of pot codes, and the concept of using pot codes to date your guitar. More questions to come but this really would address most of what I want to change with this amp. I ordered a complete set of F&T caps,havn't arived yet.ģ- Question # 2 why has the 220ohm restistor been replaced with those green ones? The large one is 640ohm and it is in series with another one that is unmarked? This is not original and I have a 250ohm block type on hand to replace those, but I would like opinions first as maybe there is a reason that 640ohm was chosen with the new PT? Question #1:Is this a good,suitable PT for this amp?Ģ- Electrolytic caps. Looks to be the same specs as stock but its much thicker for better cooling? There is a new PT in this thing,I'll include a photo of the specs. I'm hoping that new filter caps will help here. There is some power supply noise that remains constant regardless of the vol/tone settings. But I kinda doubt it now.Really a great,clean little handwired Fender amp. I thought I would be doing a bunch of the recommended mods like the tone control mod,hasselbrock mods,jumpering the RF blocking cap etc. Ok, the amp arrived and she works great.Instantly greeted me with a beautiful Fender clean tone. To me the DC blocking aspect of it is important, especially in this day and age of a huge pile of effect pedals on a "pedal board" in front of the amp, especially if older FX pedals are used. As I mentioned earlier, the real RF problem with amps like this is that which occurs because the input jack loses a solid ground connection. The amp really doesn't have the bandwidth for RF to be much of a problem. But pardon my being a smart Alec, but might as well install garlic cloves to ward off elephants. If you wasn't to stick one in there anyway, yes it will not hurt anything. it won't affect anything the amp is likely to do. If you remove it, I see no benefit adding the bead. never mind that the effect would be outside the audio range or some such. ![]() Someone rationalizes that such and such effect would be diminished by some mod. ![]() A lot of mods are common, and a lot of those common mods are done for specious reasons. You can tack a wire across it when you get there just to see if it affects the sound of the amp.
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