All Transistor Equivalent Book [best] «Free — Series»

Major semiconductor manufacturers still produce their own cross-reference guides:

| 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

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Vintage repairs and comprehensive cross-referencing. 2. NTE/ECG/SK Cross-Reference Guides all transistor equivalent book

Comprehensive technical digests that categorized semiconductor parameters.

While technically manufacturer catalogs, these massive volumes historically included cross-reference sections mapping competitors' parts to their own product lines. Understanding Transistor Numbering Systems

: A classic by B.B. Babani, this guide is a staple for hobbyists. You can view the Babani Transistor Equivalents and Substitutes on World Radio History. Second Book of Transistor Equivalents