MOVs

[lowell]

Anyone know if this is a good MOV for tube amps power transformer protection?

http://www.mouser.com/Search/Product...g87taL8A%3d%3d

[Earl]

The thing about MOV's is that they degrade every time they take a 'hit'.

If you're nned spike protection, you can use a cap.

[Don Moose]

... or a good bipolar tranzorb (Google TVS protection and read the application notes on sizing for your local voltage)

Vishay makes some nice parts.

Hope this helps!

[lowell]

guys, I appreciate the advice and will definitely look into those bipolar tranzorbs (funny name), but will the mouser part i listed suffice? i have a bunch and need something quick for temporary fix.

[Don Moose]

According to the Selection Guide, this is not a good choice. You need an MOV good for at least 170V.

Hey, wait - the datasheet says your part number is OK to 200V (suitable for 120VAC), but the Mouser description says 130VAC ... I guess your choice was good in the first case.

Sorry for the confusion.