![]() ![]() master the basics of preamp, power amp, and power supply design. Guitar Amplifier Electronics: Basic Theory Gain at 10Hz, well below audio, is down by more than decibel, which contributes to inter-stage decoupling. attenuation at 82Hz is less than a tenth of a decibel. The large 0.047μF coupling capacitor creates a flat response The load of the 500kΩ volume control attenuates the output by 0.8dB, The unloaded gain and output impedance are 37.8dB and 49kΩ, respectively.Īccording to the Coupling Capacitor calculator, New! Guitar Amplifier Electronics: Fender Deluxe - from TV front to narrow panel to brownface to blackface ReverbĪccording to the Preamp Gain and Output Impedance calculator, This is well beyond the maximum output signal level from a typical pickup. ![]() This makes the input headroom 1.4V peak ( -0.1dBV). The DC grid bias is slightly cooler than neutral: 1.4V from cutoff according to the AC load line. The calculator indicates that the DC current load on the power supply is a modest 0.5mA. The AC load for each channel is a 500kΩ volume control. The 12AX7 calculator shows that the DC grid bias is -1.6V. So its effective resistance per triode is 3kΩ, double its actual value.įor a 275V plate supply and a 220kΩ plate load resistor, Under DC conditions the cathode resistor carries the current of two triodes, ![]() That share a 1.5kΩ cathode resistor and 25μF bypass capacitor. The first stage preamp contains two voltage amplifiers, one for the bright inputs and one for the normal inputs, There are vintage tone monsters and then there's the tone goddess - the AC30." "Few vintage tube amps have attained the gilded reverence heaped upon the Vox AC30.Ĭertainly, the late 1950s Fender tweeds and Marshall's JTM45 and Plexi amps are equally lust-worthy in the eyes and ears of many players and collectors, but JMI's creation is often discussed with an added catch of the breath, an excited charge in the air. ![]()
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