Hi!
I'm building Marshall-style 50W PP guitar amp with EL34 power tubes in class AB1.
I already have OT with Primary-to-Secondary_8ohm ratio = 23.13, which means Raa=4280 ohms.
In other words the OPT is 4.2K : 8 and this is a starting point for power amp calculation.
Having read this nice article (loadmatch4-pp-beamtetrodes) I made the calculation.
Here it is.
Please check it, because I'm confused with such small Ea=400V for 50W of output power.
I would be very appreciate for any help to understand my miscalculations.
I'm building Marshall-style 50W PP guitar amp with EL34 power tubes in class AB1.
I already have OT with Primary-to-Secondary_8ohm ratio = 23.13, which means Raa=4280 ohms.
In other words the OPT is 4.2K : 8 and this is a starting point for power amp calculation.
Having read this nice article (loadmatch4-pp-beamtetrodes) I made the calculation.
Here it is.
Please check it, because I'm confused with such small Ea=400V for 50W of output power.
An externally hosted image should be here but it was not working when we last tested it.
I would be very appreciate for any help to understand my miscalculations.
Yes, it seems correct. At full power, the voltage swings from 355V of push to 355V of pull, and the current swings from 330mA push to 330mA pull.
For a sine wave, the rms voltage is 355/sqrt(2), and the rms current (in amps) is 0.33/sqrt(2).
Power output (for a sine wave) is 355/sqrt(2) x 0.33/sqrt(2)= 355 x 0.33 / 2 = 58.6 watts
For a sine wave, the rms voltage is 355/sqrt(2), and the rms current (in amps) is 0.33/sqrt(2).
Power output (for a sine wave) is 355/sqrt(2) x 0.33/sqrt(2)= 355 x 0.33 / 2 = 58.6 watts
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