Common Parts That Are Not So Common :/

[puretube]

how about 571 instead of 570?
https://www.futurlec.com/Linear/NE571Npr.shtml

Equivalents to the NE57x are SA57x

and then there is the mysterious MC33111:
https://www.digipart.com/part/MC33111
https://www.nxp.com/docs/en/data-sheet/MC33111.pdf

[amz-fx]

Stompboxparts has the V571D from Coolaudio, which is an equivalent part

[steveyraff]

How about the 2N4416. Anyone know of a reputable place to find any?

Used to get them cheap and plentifully. Hardly any around now. Mouser has them. I have to pay like 20 bucks for delivery if I don't want to spend over £90 or something. Meh.

Someone once recommended an equivalent - but for the preamp I use them in, the output volume was considerably lower.