Reply to thread

Message

<blockquote data-quote="Grinder1989" data-source="post: 6245555" data-attributes="member: 573303">You can&#039;t replaced 9 or 8 fets in a 4kw.&nbsp; If one section of the powersupply goes, it takes out 14 fets and possibly the drive transistors (which should always be replaced).&nbsp; As long as the parts are the same, (in a 4kw, 28 064N&#039;s are usually replacements for the factory parts) then you can replace that section of the powersupply and the amp will last as long as it&#039;s not abused.&nbsp; You should always replace all the fets when a powersupply goes, I&#039;m just stating that you don&#039;t *have* to.&nbsp; I have yet to find a good argument that says you have to replace fets in a matching set.&nbsp; Parts are parts.They all function the same (as long as they are identical part numbers) and I doubt a different batch is going to yield enough of a difference to negatively affect the amp.&nbsp; You have to keep in mind that parts are already made to match up as close as possible.&nbsp; When a powersupply is rebuilt, you should replace all the fets, bad or not.&nbsp; That&#039;s what I do, and that&#039;s what you do, and every other amp repair shop that has a good guy running it does.&nbsp; I just don&#039;t buy that matching part set thing.&nbsp; It&#039;s not that it&#039;s a bad idea, I just think it&#039;s not a necessity.&nbsp; Now if it&#039;s a Stetsom, that&#039;s a different story lol.</blockquote>

[QUOTE="Grinder1989, post: 6245555, member: 573303"] You can't replaced 9 or 8 fets in a 4kw. If one section of the powersupply goes, it takes out 14 fets and possibly the drive transistors (which should always be replaced). As long as the parts are the same, (in a 4kw, 28 064N's are usually replacements for the factory parts) then you can replace that section of the powersupply and the amp will last as long as it's not abused. You should always replace all the fets when a powersupply goes, I'm just stating that you don't *have* to. I have yet to find a good argument that says you have to replace fets in a matching set. Parts are parts. They all function the same (as long as they are identical part numbers) and I doubt a different batch is going to yield enough of a difference to negatively affect the amp. You have to keep in mind that parts are already made to match up as close as possible. When a powersupply is rebuilt, you should replace all the fets, bad or not. That's what I do, and that's what you do, and every other amp repair shop that has a good guy running it does. I just don't buy that matching part set thing. It's not that it's a bad idea, I just think it's not a necessity. Now if it's a Stetsom, that's a different story lol. [/QUOTE]

Verification