150v/ 50 amp MOV

[Big Jim]

Hello folks, I am getting the last few components together for my Express
build and I have a question.... (hopefully there wont be too many). The layout shows a 150v 50 amp varistor across the power switch to provide spike protection. I am having difficulty locating this part. Does anyone have an alternate value or part# that will work in this application. I'm new to the TW circuit, (and a relative newbie) to building amps. I appreciate any help that might be offered. Jim

[M Fowler]

Radio Shack sells the 130v varistor if you can't locate anywhere else.

[Firestorm]

Yeah, 130V is the value you want. Don't know where you saw the 50A number; you won't find one with a surge rating that low. More like 5KA or more. (You also don't really need that part unless you plan on being struck by lightning).

[M Fowler]

Yeah but its required for a Trainwreck

[Firestorm]

Proper colored wire, too. But that goes without saying ...

[Big Jim]

Thanks guys,
I kind of figured it was an optional part. However I do live in the lightning capital of the world (Florida) especially in the summer. I run surge protectors anyway. I'll try Radio Shack locally and see what they have. I appreciate the info. Jim