TS321

Single BJT-Input Op-Amp DIP-8 / SOIC-8.1 circuit uses this part.

Datasheet · from ti.com

Substitutes same socket

Parts that fit the same socket: the same function, pin count and pinout. 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	Input	Supply	GBW	Slew	Noise	Iq	Boards
TS321	bipolar	3–30 V	0.8 MHz	0.4 V/µs	50 nV	0.6 mA	1

Single-supply LM321-style op-amp sold only in SOIC-8 and SOT-23, so a DIP socket needs an adapter.

Fits the same socket

Part	Input	Supply	GBW	Slew	Noise	Iq	Boards	Differs
OP07CP	bipolar	6–36 V	0.6 MHz	0.3 V/µs	9.8 nV		1	Precision but slow (0.3 V/µs); its offset trim uses pins 1 and 8, not the 741's 1 and 5.
741		10–30 V		0.5 V/µs		0.13 mA	256	rated from 10 V. This 2026 revision lists pins 1 and 5 as no-connect on the DIP, so an offset-trim pot there does nothing.
LM308	bipolar	10–36 V				0.3 mA	96	needs a compensation capacitor across pins 1 and 8; rated from 10 V. Needs a compensation capacitor (30 pF typical) between pins 1 and 8; the cap sets slew rate and tone.
LM301A	bipolar	10–36 V		1 V/µs		1.8 mA	23	needs a compensation capacitor across pins 1 and 8; rated from 10 V; draws 1.8 mA per amplifier. Externally compensated: needs a capacitor (30 pF for unity gain) between pins 1 and 8, and the value sets its slew and treble response in fuzz and distortion circuits.
TL061	JFET	10–30 V	1 MHz	3.5 V/µs	30 nV	0.2 mA	34	JFET input; rated from 10 V. Low-power JFET op-amp at 200 µA; the pin table gives offset null on 1 and 5 though the drawing marks them NC.
LF355	JFET	?–36 V	2.5 MHz	5 V/µs	20 nV	2 mA	1	JFET input; draws 2 mA per amplifier. Lower-power, slower sibling of the LF356.
CA3140	mosfet	4–36 V	4.5 MHz	9 V/µs	40 nV	4 mA	12	MOSFET input; draws 4 mA per amplifier; much faster, may oscillate in a slow part's place. MOSFET input that reaches 0.5 V below the negative rail, internally compensated; draws about 4 mA.
TL071	JFET	4.5–40 V	5.25 MHz	20 V/µs	37 nV	1.4 mA	178	JFET input; much faster, may oscillate in a slow part's place. JFET input; this revision shows pins 1, 5 and 8 as no-connect on the DIP, so no offset trim.
TL081	JFET	4.5–40 V	5.25 MHz	20 V/µs	37 nV	1.4 mA	20	JFET input; much faster, may oscillate in a slow part's place. JFET input; this revision shows no offset-null pins on the DIP.
LF356	JFET	?–36 V	5 MHz	12 V/µs	12 nV	5 mA	14	JFET input; draws 5 mA per amplifier; much faster, may oscillate in a slow part's place. JFET single drawing about 5 mA; specified at ±15 V.

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Belton 2h digital reverberation module 74HC14 · PT2399 · TS321	—	Reverb	PCBWay: Glory to Ukraine	—	—	—	68