Hitachi 2SJ56/2SK176 Audio Power Transistor Pair: Complete Technical Guide and Applications
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This J56/K176 record shows two pairs of Hitachi-marked metal-can devices. The visible short marks are J56 JAPAN 3A1 B and K176 JAPAN 2L1. The supply entry describes refurbished parts that can present as new; that condition remains part of the article.
Identification and delivery details
The four loose devices are photographed face up on foam and from the underside. Two devices carry each short mark. Their flange has two mounting holes, and each underside has two insulated leads. The images provide useful package and marking comparisons, but no installed circuit, powered test or measured matching report.
The delivery entry is dated 17 January 2026 and lists two pairs, Japanese manufacture and a one-month warranty. Its condition wording is refurbished, capable of a new-like appearance. A clean case does not change that wording to factory new.
The article title uses the longer 2SJ56/2SK176 designations. The case photographs themselves use J56 and K176. Keep both forms available when discussing the parts, and resolve the complete identity against the original device documentation before choosing electrical limits or pin connections.
| Item | Evidence |
|---|---|
| Record | J56/K176 |
| Photographed marks | J56 JAPAN 3A1 B; K176 JAPAN 2L1 |
| Title designations | 2SJ56 / 2SK176; shortened marks appear on cases |
| Visible brand | Hitachi-style logo |
| Quantity | Two pairs / four devices |
| Physical evidence | Metal cans, two-hole flanges, two insulated leads per device |
| Condition | Refurbished; described as capable of a new-like appearance |
| Recorded warranty | One month |
| Delivery date | 17 January 2026 |
| Weight field | 0.5 kg; not an independently measured individual device weight |
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Matching this part
Use the markings and underside views to compare the removed component. Check case connection, lead assignment, insulating washers and heatsink mounting against the original drawing. The photographs do not establish a universal drop-in replacement.
Specify whether a repair needs electrical matching within each pair or across an output bank. Those measurements are absent from this delivery record and should be agreed separately from the visual condition.
Photos and recorded media
Related records and products
The J49/K134 record covers a different pair and a different stated condition.
Request this part
Provide the original markings, board reference and matching requirements when requesting these refurbished pairs. Confirm quantity and warranty terms for the current delivery.
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