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<WTA>Tube biased by LED
<WTA>Tube biased by LED
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Old 24th October 2008, 02:25 PM   #1
arwan_zoel is offline arwan_zoel  Indonesia
diyAudio Member
Join Date: Oct 2008
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..??
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Old 24th October 2008, 02:33 PM   #2
Eli Duttman is offline Eli Duttman  United States
diyAudio Member
Join Date: Apr 2004
Location: Monroe Township, NJ
Using LEDs for bias eliminates the cathode bias resistor bypass capacitor. That cap. has caused its share of consternation.
Eli D.
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