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Old 24th October 2008, 02:25 PM   #1
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Question <WTA>Tube biased by LED

i wanna build Tube pre-amp. im using 5687 tube.
i have found The Pre-amp circuit but that circuit biased by LED...
what is the profit if i using LED for biasing..??
thanx..
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Old 24th October 2008, 02:33 PM   #2
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Using LEDs for bias eliminates the cathode bias resistor bypass capacitor. That cap. has caused its share of consternation.
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