I am currently working on a Randall commander II. The tremolo does not work due to a faulty "roach". As some of you know, and some may not, the "roach" is a four legged component that contains a light bulb, and a photo resistor. The bulb flashes per the tremolo settings, and the photo resistor controls the volume of the amp. So, to my question....I am having difficulty finding a replacement, and wondering if a Fender roach would work? For that matter, are these roaches all essentially the same for different amps? Wondering if I could make one, but would have to know the specs of the photo resistor and light bulb. Any thoughts on how to fix this amp? Any help would be appreciated..thanks.