What effect?

[BassWaffle]

What fuzz/overdrive do you guys think he used for this recording?

I Haven't Got My Strange- Arctic Monkeys

Arctic Monkeys - I Haven't Got My Strange - YouTube

[SoonerMatt]

He doesn't use effects - his grit comes from driving either his Ampeg or Hiwatt head. As luck would have it, there's a German/Germanic hipster comparing the same amps O'Malley uses:

Hiwatt DR103 -72 played with a bass - YouTube

[BassWaffle]

thanks! would a pedal would be able to replicate that sort of sound though?

[SoonerMatt]

If you wanna copy the Ampeg you can use a Tech21 VT Bass or Catalinbread SFT. I don't know one that'll copy the Hiwatt.

[chronolynx]

A Tech21 Leeds will cover the Hiwatt.