![]() ![]() Totem pole and SRPP tube amplifiers require high impedance loudspeakers. The maximum power into 8 ohms is thus 0.63 Watts not 16W. This allows a maximum signal of 0.28 A RMS. Therefore with your HT voltage the maximum allowable standing current is 0.4 Amp. The maximum dissipation allowed in a 6C33C is 60W per tube. Main question is how stable it is, wrapping GNFB around such "inter-stage transformer".Īttaching the asc and inc (changed to txt) file, i am hoping someone with better skills in LTSpice could simulate a more real-life condition and check the stability. ![]() The toroid model is also still too perfect, with no winding resistance, inter-winding capacitance and leakage inductance. You can, however, use the more ubiquitous LM1875 or TDA2030 family since the chipamp itself is making more than 24dB gain. Maybe it's the 6C33C model i'm using but some say at Vg=0 and Vak=150v, 6C33C might give 2.5A current, which translates to 25W to 8 ohm.Ĭhipamp shown is OPA541 which is unity gain stable. It gives you 16W output while dissipating about 220W for single channel. Want to spend more on your electric bills? Need a way to make a chipamp have much worse efficiency and lower output power? Attached schematic might help you achieve those goalsīasically a chipamp fed to a dual primary toroid transformer (24V to 110V+110V, 24v secondary as input from chipamp) driving totem-pole 6C33C output stage, wrapped in super-triode connected GNFB. ![]()
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