I can help look up the exact electrical parameters and find a safe substitute for your circuit. Share public link
| Original Germanium | Suggested Modern Sub | Modification Required | | :--- | :--- | :--- | | AC128 (PNP) | 2N3906 + 1N5711 on base | Add diode, re-bias collector to 50% Vcc. | | OC71 (PNP) | BC557 (low gain) | Reduce base resistor by 30-50%. | | 2N107 (NPN) | 2N3904 | Increase base resistor to reduce collector current. | all transistor equivalent book
If you are looking to find a substitute for a specific component right now, please let me know: What is the printed on your transistor? What type of equipment are you repairing? I can help look up the exact electrical
Popular among vintage audio repair technicians, the Jaeger guides offer exceptional coverage of European and early American transistors. It remains highly prized for restoring classic high-fidelity amplifiers and radios. 4. Philips/NXP and Motorola Semiconductor Data Books | | 2N107 (NPN) | 2N3904 | Increase
Similar to NTE, the ECG line (later acquired by Sylvania and NTE) was a staple in TV and radio repair shops. The ECG Master Replacement Guide is still found on the shelves of vintage gear restorers worldwide. Key Parameters for Finding an Equivalent Transistor
: This book is specifically designed to help users find replacements for hard-to-find transistors. NTE Electronics is well-known for its component cross-reference guides.
: Use major component distributor websites to filter by voltage, current, and package style to discover identical parts.