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Tube amp power supply dropping resistor. I went with a tube rectifier and a choke-input filter.
Tube amp power supply dropping resistor. Sep 6, 2006 · Hello, I am building a tube amp (for guitar) from bits and pieces I have acquired over the years, including the main power (plate) transformer. For example, a 12AX7 can dissipate about 2ma per triode, but is usually roughly center biased hence the 1. Apr 17, 2016 · The entire process relies on assuming that the rectifier, when conducting, acts like a resistor. Oct 7, 2015 · For an accurate current number, you'd need to establish load lines and bias points for all tubes fed by a particular power supply node. So if you can figure out how this resistance acts at your planned load current, you can get your power supply design just right. The third resistor in the Marshall circuit (56k in your example) is a shunt resistor (in series with bias pot to ground) that prevents the bias voltage from becoming too small when you dial back the bias pot. Without adding any power supply resistance, the transformer will give less than 340v when loaded. Jul 18, 2020 · Value of first power supply dropping resistor with different power transformer? by Spectre » Wed Jan 12, 2022 1:39 pm Hi, After building a few amps from schematics and layouts, this is my first foray into some technical questions. I put the diagram as shown in LTSpice and was working out the resistors and after a little trial and error, voila! Ohm's law is the reason for that, and also the reason the resistor has little/no effect in a power supply which is not actively supplying power to tubes. On my previous build (25 watt), I guessed at it and changed the resistors out until I had the right voltage in my preamp. May 31, 2017 · The dropping resistors help to set the maximum negative voltage required to make the tube 'turn off', which is dependent on tube type. Mar 22, 2019 · In order to get the B+ voltage low enough for the preamp, I'll need to use different (larger) resistor values in my 50 watt power supply. The problem is that it is supplying more voltage than the circuit I am working on requires. 1ma assumption. If you put an ammeter on one and listen to music you'll see it dancing around. I went with a tube rectifier and a choke-input filter Power Supply Drop Resistor by JJH0906 » Tue Mar 01, 2022 1:09 am Hey gang! I am trying to get together my drop resistor network for my build but I'm having some trouble in getting things to work out. I put the diagram as shown in LTSpice and was working out the resistors and after a little trial and error, voila!. I'd really appreciate any advice! I have a schematic that I'm working to that has a PT with 310-0-310VAC. Nov 10, 2018 · Voltage drop across a resistor is a function of current flow through it, and an AB amp like most push-pull amplifiers will use more current as output power goes up. Nov 2, 2021 · I am trying to get together my drop resistor network for my build but I'm having some trouble in getting things to work out. I am going to work through the procedure by designing a supply for a mythical low power stereo amplifier. So 1K before the reservoir cap has ALL of the amp's current pulled through it and will produce a greater voltage drop than a 1K resistor added in between the power tube plate node (OT really) on the B+ rail and the screen grid node. Oct 31, 2024 · 1kΩ Resistor: First in the chain, it provides an initial drop to supply the phase inverter and parts of the preamp, setting the stage for overall power and tone. Oct 24, 2021 · I am trying to build a hifi amp from scratch, and when I studied the tube hifi schematics, I found most, if not all, use a large dropping resistor (B+) right before the 1st input gainstage. bikboletvuuivjgglehuvbbstcbzeyetxbctjabsrgyy