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24th October 2008, 02:25 PM
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#1 |
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diyAudio Member
Join Date: Oct 2008
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<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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24th October 2008, 02:33 PM
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#2 |
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diyAudio Member
Join Date: Apr 2004
Location: Plainsboro, NJ
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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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Eli D. |
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