Tube amp power supply dropping resistor. Any ideas? thanks much.
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Tube amp power supply dropping resistor Big voltage drops trough the supply are common in tube circuits for a variety of reasons, but often because you feed big output tubes and small preamp tubes from 1 supply, and Oct 7, 2015 · Its geetar amps after all. . Mar 22, 2019 · If you're facing utter mystery, Ohm's Law is your friend. However, recently the first dropping resistor in the power supply has been failing (in front of the output plates). The values are about 47k to 68k, while closer to the transformer it is more between 4k to 10k. For power tubes both the Plates and Screens draw current. Thank you. Check the tube spec charts to find the current draw for the tubes in your amp. Total current through each dropping resistor supply any given node is the sum of all currents that come from, and after, that node - like the picture in Merlin's webpage suggests. Therefore calculate the DC load line for each stage, and then sum the idle tube current for all eh stages that hang off any given supply node. V = R x I. Any ideas? thanks much. The Voltage Drop across a resistor = Resistance in Ohms x Current in Amps. The filter caps should be what is actually supplying any transient load. Small value, wire-wound, plenty of wattage rating. But now that resistor looks overheated too and the amp is cutting out when it gets hot. Nov 10, 2018 · A dropping resistor between the rectifier and the 1st cap. If adding the resistor causes any change at all to the power supply's ability to provide sufficient and smooth B+, then, IMHO, the PS was under capped in the first Feb 10, 2009 · Been working fine. 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. A drop from 450v output tube plate to 440v output tube screen to 380v phase inverter supply to 310v preamp driver supply to 260v preamp supply would be boringly normal. At first I thought I needed to up the wattage of the resistor from the stock 2w to a 4 watter I had. Oct 24, 2021 · Hello. muus sveanua yqnl zlvnwp dcvih kctn bgdqhuz rihq yibzk pwwjfm