![]() If you are having trouble getting your amplifier to work, you can use the load line to determine if the problem is in the voltage or current values. Now that you know how to draw load lines for guitar amps, you can use them to troubleshoot amplifier circuits. ![]() This point is the operating point of the circuit. To do this, find the point where the load line intersects the X-axis. Once you have drawn the load line, you can use it to determine the operating point of the circuit. The line should start at the origin (0,0) and end at the operating point of the circuit. Start by plotting the voltage values on the X-axis and the current values on the Y-axis. Once you have these values, you can begin to plot them on a graph. These values can be found in the datasheet for your amplifier. To draw a load line, you will need to know the voltage and current values for your circuit. The operating point is the point at which the circuit is stable and will not oscillate. Load lines are important because they can help you determine the operating point of a circuit. In other words, it shows you how much current will flow through a given circuit if a certain voltage is applied to it. A load line is a graphical representation of the relationship between voltage and current in an electronic circuit. The first step in learning how to draw load lines for guitar amps is to understand what a load line is. There are many different types of guitar amps, but they all share one common goal: to make the guitar sound louder. They are typically used by rock and blues guitarists. The only thing i really not sure of (thinking about it now) is whether or not the the schematic had 6V6s or if it was the 6BQ5(EL84) version.Īll the ones I found online that with the mains drawn the way Im describing have 6BQ5s, and the amp I was working on had 6V6s.Guitar amps are devices that amplify the sound of an electric guitar. But Im pretty sure I remember it looking like original Fender. Is it possible you're working drom the "unofficial" schematic? And thatcthe creator's example had one of those batshit bare wire fuses but it was mistaken for a piece of wire? The single Fender layout diagram I found did not show anything either. But a third "unofficial" schematic seemed common that was NOT official Fender, that did not show anything. I found two official Fender schematics one of which showed a "CSA Thermal Protector" & the other which showed a regular fuse. But they also look a good bit different from any official Fender schem I've seen, compared to others of thecsame period. Have any of you run into this on this model?ĥ4144Now that's cheap and dangerous of the bean counter.Įdit: seems all of the "homenade" schematics show 6AQ5s. The mains current didn't exceed much more than ≈500mA at full output, so I chose a value of 1A/slow. The cap was removed, and installed an inline cap from the live to the power switch.īefore choosing a value, I ran the amp into clipping at full power, while monitoring the mains current draw. Inside, there was the typical 70's fender tag strip with one of the legs of the incoming mains coupled to the chassis with the blue radial cap. Apparently, fender installed what appears to be a thermal fuse in some other/later models. It has a UL sticker on the back panel as well. I double checked on the schematic and confirmed that it was designed and built without one, which is crazy to me. I mean, there was no mains fuse at all, and there never was in this amp!!. Not like, the fuse was missing from the fuse holder. So, after replacing the mains power cord with a new molded plug, I went to check the fuse and. One of the other routine checks I make, particularly in vintage amps, is confirming the fuse value and rating is the one specified. More often than not, it's a disaster and it gets replaced–as this one did. ![]() We see this a lot, and I always check the condition and wiring inside. The molded plug end had been replaced by an old 3-prong replacement with screw terminals. We had a 70's Musicmaster Bass amp that came in for general cleaning/service (dates to '79, it looks like). ![]()
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