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Old 28th February 2013, 07:02 PM   #1
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Default GU50 Screen Driven, DC Coupled

My new idea with GU50. Screen driven and DC coupled. Is that possible?

Very first schematic:
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Old 1st March 2013, 05:10 AM   #2
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It is possible, but screen drive is not very linear and high driving level is required.
With 100 Vpp the output power is some 3,3 W (2k5 OPT), THD = 6 %
With 240 Vpp, 13 W, THD = 14 %. Distortion is mainly 2nd harmonic.
All the above values are from LT Spice simulation.
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Old 1st March 2013, 05:18 AM   #3
AJT is offline AJT  Philippines
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it's been done here....EL36: Applications in Audio
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Old 1st March 2013, 08:10 PM   #4
Ketje is offline Ketje  Belgium
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By connecting the cathode-resistor of the second triode to the first triode's cathode you get a positive feedback.The portion of feedback has to be less then the amplification of the first triode or else the circuit will oscillate.
Mona
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