Parts · Diodes

RD9.1E

Si Zener 9.1 V.1 circuit uses this part.

Substitutes same voltage

Zeners of the same voltage. The figures are read off each part's datasheet (this one's from page 5), typical where the sheet gives a typical value, otherwise the maximum. Closest first; the last column says what differs. A different part can change the sound, and a circuit may lean on one particular figure, so read the build document's notes before you swap.

This part

Part	Vz	Power	Package	Boards
RD9.1E	9.1 V	0.5 W	DO-35	1

500 mW zener; the B1-B4 suffix only picks a narrower slice of the voltage spread.

Alternatives

Part	Vz	Power	Package	Boards	Differs
1N4739	9.1 V	1.3 W	DO-41	40	DO-41 body. 1.3 W zener in DO-41, ±5 % tolerance.
1N5239B	9.1 V	0.5 W	DO-35	10	500 mW zener in DO-35; B suffix is ±5 %, C is ±2 %.

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Zoom Trimetal 2SC2712 · 2SK208-Y · 4558 · NJM4558M	—	Distortion	Experimentalists Anonymous	—	—	—	76