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Augustica Corvette, Manual

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Corvette

®

Headphone Amplifier With

Two 6922 (6H23P/6N1P) Tubes

Augustica

®

T e c h n o l o g i e s

w w w . a u g u s t i c a . c o m

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Summary of Contents for Corvette

Page 1: ...Corvette Headphone Amplifier With Two 6922 6H23P 6N1P Tubes Augustica T e c h n o l o g i e s w w w a u g u s t i c a c o m ...

Page 2: ...ed to slowly power up the power supply of the kit as it is better to have a misoriented electrolytic capacitor or a mislocated resistor blow at low voltages rather than at high voltages Once the power supply is powered up be cautious at all times In fact even when the power supply is disconnected or shut down assume that capacitors of the power supply will have their high voltage charges retained ...

Page 3: ...stic and low crosstalk between the left and the right channels The headphone amplifier Corvette employs a cathode follower design suitable for use with a single or dual headphone with each headphone element having impedance between 15 and 300 Ω for the total of 30 to 600 Ω AMPLIFIER THEORY OF OPERATION The circuit of the headphone amplifier Corvette is shown in Figure 1 Corvette s schematic also a...

Page 4: ...The capacitors connected in parallel with the diodes of the rectifying bridge D1 D4 suppress high frequency noise generated by the diodes of the rectifying bridge The high DC voltage then is applied to a MOSFET transistor that serves as a voltage regulator and AC filter Resistors R24 and R25 are responsible for a 15 second delay during which the high B plus DC voltage reaches its maximum level of ...

Page 5: ...ttach the MOSFET transistor IC1 to its heatsink This transistor is extremely sensitive to electric static therefore you must use ESD safe soldering station and you also must ware an ESD bracelet Once you attached the MOSFET transistor to its heatsink you can insert heatsink leads and the MOSFET transistor leads into the PCB Solder the leads of the MOSFET transistor to the PCB At this point do not ...

Page 6: ...e low voltage bus of the power supply as a whole If you applied 8 Volt AC to the terminal block K3 the power supply should deliver about 11 Volt DC Measure AC component that is present in the filament DC voltage after it is regulated and filtered by the IC2 LD1084V The AC component of the filament DC voltage should be about 0 6 millivolts AC If your measurements show substantially higher value of ...

Page 7: ...h B plus voltage transformer or variac windings to the terminal block K2 and slowly bring up the high AC voltage while looking for smoke or part discoloration or bulging Fifth measure the B plus voltage provided by the MOSFET transistor IC1 If you applied 220 Volt AC to the terminal block K2 the power supply should deliver about 320 Volt DC without any load measured at the MOSFET transistor If the...

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