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ECC822 Tube OTL headphone amplifier circuit diagram

2015-01-05 00:20  
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ECC822 Tube OTL headphone amplifier circuit diagram
The tubehas the advantages ofgood index and long life. Preamplifier is used for driving headphones by generating sufficient signals. Then it outputs pre-amplifier stage directly through C1、R1. But R1、C1 must provide negative gate bias. Gain is essentially determined by the R8. The maximum input voltage is determined by the R2. R9: The static anode current is chosen in maximum possible part of characteristic curve. The input signals is inversed and enlarged on anode through C2 coupling to second level gate. The second stage cathode resistor is divided into two parts, R5 and R6. R5 and R6 form a load resistor in series.