Photocell Silonex/Advanced Photonix NSL-7532
Non-hermetically sealed version of the NSL-7530. These meet the published factory spec of 6.7 meg dark resistance; most are about 10 Meg. They work in the 'Vibe, but the depth of the notch is lower than with my made-to-order parts. They are also fine for many other modulation effects.