Amplifier - Input Stage, Buffers, and Rail Splitter
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| Part |
Quantity |
Description |
| Circuit Board |
| - |
1 |
Compact Tube Hybrid - Complete Circuit Board |
| Potentiometers |
| Volume |
1 |
Dual 50k Audio Taper - Alps RK097 |
| Resistors |
| R1L, R1R, R5L, R5R |
6 |
1/8W 1% Metal Film Resistor 1MΩ |
| R2L, R2R |
2 |
1/8W 1% Metal Film Resistor 300Ω |
| R3L, R3R |
2 |
1/8W 1% Metal Film Resistor 1.5kΩ |
| R4L, R4R |
2 |
1/8W 1% Metal Film Resistor 10Ω |
| R6L, R6R |
2 |
1/8W 1% Metal Film Resistor 30.9kΩ |
| R7L, R7R |
2 |
1/8W 1% Metal Film Resistor 18kΩ |
| R8L, R8R |
2 |
1/8W 1% Metal Film Resistor 2kΩ |
| R9L, R9R, R10L, R10R, R2S, R3S |
6 |
1/8W 1% Metal Film Resistor 22Ω |
| R11L, R11R, R12L, R12R |
4 |
1/8W 1% Metal Film Resistor 220Ω |
| R13L, R13R |
2 |
1/2W 1% Metal Film Resistor 1k5Ω |
| R14L, R14R, R15L, R15R |
2 |
1/8W 1% Metal Film Resistor 100kΩ |
R16L, R16R, R17L, R17R,
R5S, R6S, R7S, R8S |
8 |
1/8W 1% Metal Film Resistor 6.8Ω |
| R18L, R18R |
2 |
1/8W 1% Metal Film Resistor 0-150Ω - See Notes |
| R1S, R4S |
2 |
1/8W 1% Metal Film Resistor 2.7kΩ |
| R9S |
1 |
1/8W 1% Metal Film Resistor 100Ω |
| Capacitors |
| C1L C1R |
2 |
Aluminum Electrolytic 10u 10V |
| C3L, C3R, C7L |
2 |
Metalized Polyester/Polypropylene Film Capacitor 100n 63V |
| C2L, C2R, C5L, C5R, C6L, C6R |
6 |
Non-polar Aluminum Electrolytic 10u 25V |
| C4L, C4R |
2 |
Metalized Polyester/Polypropylene Film Capacitor 220n 100V |
| C1S |
2 |
Mica Capacitor 10p 300V |
| Diodes |
| D1L, D1R |
2 |
2mA Current Regulating Diode |
| D2L, D2R |
2 |
4.3mA Current Regulating Diode |
| Transistors |
| Q4L, Q4R, Q1S |
3 |
BC560C - See Notes |
| Q5L, Q6L, Q6L, Q6R, Q7L, Q7R, Q2S |
7 |
BC550C - See Notes |
| Q8L, Q8R, Q3S, Q5S |
4 |
BC337/25 - See Notes |
| Q9L, Q9R, Q4S, Q6S |
4 |
BC327/25 - See Notes |
| Integrated Circuits |
| ICL, ICR, IC1S |
3 |
High Beta, Jfet Input Single Opamp - TL081 |
| IC1 |
1 |
High Beta, Jfet Input Dual Opamp - TL082 |
| IC2S |
1 |
Rail Splitter - TLE2426 |
| Vacuum Tubes |
| V1L |
1 |
Dual Triode 12AU7 or 6922 - Or similar tubes |
| Miscellaneous |
| Tube Socket |
1 |
9 Pin PCB Mount Tube Socket |
| Opamp Sockets |
4 |
8 Pin Dip Socket |
Resistors
- 1/8W Resistors are 1% Metal Film type - 7mm lead spacing.
- 1/2W Resistors are Vishay CCF55 or same size.
- R18L and R18R are for reducing gain when low Z headphones are used. The prototype users have felt that 56Ω is a good compromise value.
Capacitors
- C1L, C1R are Aluminum Electrolytic - 2mm lead spacing 5mm diameter.
- C2L, C7L, C7R are Polyester/Polypropylene Film - 5mm lead spacing 2.5mm width.
- C3L, C2R, C5L, C5R, C6L, C6R are Non-Polar Aluminum Electrolytic -2mm lead spacing 5mm diameter.
- C4L, C5L are Polyester/Polypropylene Film - 5mm lead spacing 5mm width.
- C1S is a Mica Capacitor - Approximately 2.5mm lead spacing 2mm width.
Diodes
- D1L, D1R are 2mA Current Regulating Diodes 1N5305
- D2L, D2R are 4.3mA Current Regulating Diodes 1N5313
Transistors
- Q4L, Q4R, Q1S are BC560C. These MUST be the "C" HFE class devices.
- Q5L, Q5R, Q6L, Q6R, Q7L, Q7R, Q2S are BC550C. These MUST be the "C" class devices.
- Q8L, Q8R, Q3S, Q5S are BC337. These MUST be the "25" HFE class devices.
- Q9L, Q9R, Q4S, Q6S are BC327. These MUST be the "25" HFE class devices..
- Warning: Don't, Do not substitute transistors unless you know what you're doing. Do not substitute other classes of the BC devices. Use the "C" class and the "25" class.
Integrated Circuits
- ICL, ICR, IC1S are TL081 single opamp, but any high β, jfet input opamp with the same pinout can be substituted.
- IC1 is TL082 dual opamp, but any dual high β, jfet input opamp with the same pinout can be substituted.
- IC2S is the TLE2426 rail splitter. I am not aware of any substitutes.
- WARNING: Do not use BJT input opamps as they will not satisfactorily zero the offset.
Tubes
- The design center is the 12AU7 tube. But, because of the flexible front end design, many other tube types are possible.
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