TLC555P

CMOS Timer DIP-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 4), 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	Supply	Boards
TLC555	2–15 V	3

CMOS 555 drawing at most 250 µA, with far smaller supply spikes than the NE555; output sources only about 10 mA, and 15 V is the limit.

Fits the same socket

Part	Supply	Boards	Differs
ICM7555	2–18 V	6	CMOS 555 drawing about 60 µA, with no supply glitch at each output edge, so it ticks less in audio circuits.
NE555	4.5–16 V	71	Bipolar timer drawing about 10 mA at 15 V and putting current spikes on the supply when it switches; the SE555 grade runs to 18 V.

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Light Metal Effects Penfold Ring Mod 4001BE · 4016BE · 741 · BC549	—	Distortion	Experimentalists Anonymous	—	—	—	89