What size screws for a vintage Bi-phase?

[sammy-arfie]

I was wondering if anyone knew what size the screws are on the top panel of a vintage Mu-tron Bi-phase? The ones on mine are pretty chewed up and one is missing so I was looking to replace them, but having a hard time finding the right size and thread.

[WonkoTheSane]

Generally the top screws on mu-tron stuff is 4-40

[sammy-arfie]

Thank you!