Toshiba 2SA679/2SC1079 Transistor Pair: Complete Technical Guide for Audio Amplifier Applications

16. november 2025

Historical parts record: Photos and notes below belong to this record. Confirm the offered unit’s full model, condition and available test evidence before ordering.

What is the Toshiba 2SA679 / 2SC1079 transistor pair?

The 2SA679 and 2SC1079 are Toshiba's complementary medium-power transistor pair — the PNP (2SA679) and NPN (2SC1079) devices that classic audio power-amplifier designs use as a matched push-pull pair. Each is a TO-66-style metal-can transistor: a round tin cap on a diamond mounting flange with two fixing holes, two leads through the base, and the red Toshiba print on the cap. The caps carry the gain rank O plus an hFE group suffix — the 2SA679 units here are printed O·70 or O·7D, the 2SC1079 units O·7B or O·78. They arrive seated in white foam trays, twenty per tray, with small groups bagged on red foam; every device is factory-original Toshiba with crisp print and unsoldered legs. The intake records cover three batches — six, twenty and twenty pieces, forty-six in all — received between 17 November and 24 December 2025 (about 0.5 kg per record), and the fifteen photos below show them as received.

2 min readContent reviewed 6 October 2026

Part details

Toshiba 2SA679 / 2SC1079 pair, per cap print and record
Field	Value
Manufacturer	Toshiba (red "Toshiba" script print on each cap)
PNP side	2SA679 — gain rank O, hFE groups ·70 / ·7D (per cap print)
NPN side	2SC1079 — gain rank O, hFE groups ·7B / ·78 (per cap print)
Package	TO-66-style metal can on a diamond flange, two fixing holes, two leads
Pairing	Complementary push-pull pair for audio power-amplifier output stages (2SA679 PNP + 2SC1079 NPN)
hFE group suffixes	·70 / ·7D on 2SA679, ·7B / ·78 on 2SC1079 — printed after the type number
Packaging	White molded foam trays, twenty per tray; small groups bagged on red foam
Condition	New, unused (per intake record)
Weight	About 0.5 kg per record
Intake recorded	Three batches: 17 November, 22 December and 24 December 2025

Scroll sideways to see the full table.

Fitting notes

These are the transistors vintage Japanese amplifier designs call for by name, and replacements are matched by more than type number: the hFE group suffix on the cap (·70/·7D on the PNP side, ·7B/·78 on the NPN side) decides how a pair balances in a push-pull stage, so when rebuilding an output stage, sort devices by the same group letter rather than mixing groups. The metal can is the collector — mount it to the heatsink through an insulating washer with compound on both faces, and dress the two leads without stressing the seals at the base. The trays here are factory original with the red Toshiba print crisp and legs unsoldered — unused stock, ready for pairing.

Photos

All images below are original warehouse photos of the exact transistors covered by this record, taken before dispatch. Click any photo to view it full size.

Six devices flange-up in white foam — Six devices seated cap-down in white foam: the diamond flanges with their two fixing holes and leads face up.

Six caps on red foam — Caps up on red foam: three 2SC1079 (O·7B) above, three 2SA679 (O·70) below — the complementary pair side by side.

Three 2SA679 bagged — Three 2SA679 (O·70) in a zip bag on red foam: the Toshiba print and rank mark legible on every cap.

Six caps on red foam, leads through — Another six on red foam: 2SC1079 (O·7B) and 2SA679 (O·70) in two rows, the leads pushed through the foam.

Flanges and leads close-up — Flange close-up: the two leads exit the base through blue seals, plating bright and unsoldered.

Mixed tray close-up — Tray close-up: 2SC1079 (O·7B) and 2SA679 (O·7D) mixed in the pockets, red print crisp throughout.

Twenty flanges in molded tray — A full tray flange-up: twenty devices seated cap-down in the molded pockets, five rows of four.

Twenty caps in tray by column — The same tray cap-up: the left two columns are 2SC1079 (O·7B), the right two 2SA679 (O·70) — sorted by column.

Mixed tray, two flipped — Mixed tray detail: two devices flipped flange-up in front, 2SC1079 (O·7B) and 2SA679 (O·70 / O·7D) interleaved behind.

Tray with empty pockets — Another full tray: 2SC1079 (O·7B) on the left columns, 2SA679 (O·70 and O·7D) on the right, empty pockets at the top left.

Third tray, 2SC1079 with both groups — A third tray: 2SC1079 (O·7B and O·78) on the left, 2SA679 (O·70) on the right; the edge of the neighbouring tray shows at the right.

Twenty flanges, leads up — A full tray flange-up: twenty devices with their leads and blue seals pointing out of the pockets.

2SA679 7D above, 2SC1079 7B below — Close-up, four rows: 2SA679 (O·7D) above, 2SC1079 (O·7B) below — the last device printed upside down.

Tray mixing cap-up and flange-up — Tray mixing both orientations: 2SC1079 (O·7B) at the top, 2SA679 (O·7D and O·70) down the right — both 2SA679 groups in one frame.

Two trays stacked: the upper one 2SC1079 (O·7B) and 2SA679 (O·70) by column; the lower one 2SA679 (O·7D) over 2SC1079 (O·7B), one cap printed upside down.

For power semiconductors of a larger class from the same shelf, see the Fuji Electric 6MBI300V-120-50 IGBT bridge — 300 A / 1200 V screw-terminal module.