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| The Compact Tube Hybrid Amplifier |
Epsilon 12 Muting Circuit with Indicator Lights
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| Part |
Quantity |
Description |
| Resistors |
| R1E, R2E, R6E |
3 |
1/8W 1% Metal Film Resistor 33kΩ |
| R3E |
1 |
1/8W 1% Metal Film Resistor 100kΩ |
| R4E |
1 |
1/8W 1% Metal Film Resistor 2kΩ |
| R5E |
1 |
1/8W 1% Metal Film Resistor 470kΩ |
| R8E |
1 |
1/8W 1% Metal Film Resistor 62kΩ |
| R7E, R9E |
2 |
1/8W 1% Metal Film Resistor 2kΩ |
| R10E |
1 |
1/2W 1% Metal Film Resistor 1kΩ |
| Transistors |
| Q1E, Q2E |
2 |
BC550C |
| Q3E |
1 |
MPSA14 Darlington |
| Q41E, Q5E |
2 |
BC560C |
| Capacitors |
| C1E |
1 |
Metalized Polyester/Polypropylene Film Capacitor 1u 63V |
| C2E, C3E |
1 |
Non Polar Aluminum Electrolytic 100u 16V |
| C4E |
2 |
Metalized Polyester/Polypropylene Film Capacitor 100n 63V |
| Diodes |
| D1E, D2E, D3E |
3 |
Small Signal Diode - 1N4148 |
| LE1, LE2 |
2 |
2.1V LED |
| Integrated Circuits |
| ICE |
1 |
TL081 Opamp |
| Relay |
| K1E |
1 |
Miniature 12V Relay - NEC 551-EC2-12NJ |
Resistors
- 1/8W Resistors are 1% Metal Film type - 7mm lead spacing.
- 1/2W Resistors are Vishay CCF55 or same size.
Capacitors
- C1E is Polyester/Polypropylene Film - 5mm lead spacing 5mm width.
- C2E, C3E are Non Polar Aluminum Electrolytic - 3.5mm lead spacing 8mm diameter.
- C4E, C5E are Polyester/Polypropylene Film - 5mm lead spacing 2.5mm width.
Diodes
- All 1N4148 or equivalent.
- LEDs are 2.1V 3mm Green and Red or a 3mm Dual LED to go under the tube.
Transistors
Integrated Circuits
- ICE is TL081 single opamp, but any high β, jfet input opamp with the same pinout can be substituted.
- WARNING: Do not use BJT input opamps as they may not work properly.
Relay
- The relay is NEC EC2 or exact equivalent in specs, size, and pin spacings.
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Copyright © 2007-2010 Cavalli Audio. All rights reserved.
Commercial use of these designs is strictly prohibited without prior written permission.
Use of the Cavalli Audio Logo for any purpose is strictly prohibited without prior written permission.
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