Mach5

I don't any any experience with those amplifiers, from what I've read you should replace all FETs and driver circuit, which is a PITA and the reason why the repairs are so costly..

DeadlySones

iTrader: (4)

thank you. it does appear my best (safe) bet is to replace all 24 output mosfets. I just need to finish testing the resistors to ensure they are doing their intended job properly. Looks like the ones connected to the output FET's are almost all outside their rated tolerances. So I might as well just replace all them too.

Still will be a fraction of the repair cost and no shipping of big amp... I'm not trying to be cheap... just save money I can't afford and learn something new along the way.

BigRedGuy

iTrader: (11)

Hope it works out Paul....it would be annoying to have to use it for a paperweight.....

Could be a real education in amp design by the time you're done.....

jalat

iTrader: (6)

ya ABFTW when i have two $700 paper weights sitting in my basement.... dear lord.

yo paul, when you get a chance, i got a pair of AB's you can work on too. thanks.

jonesbrooklyn

iTrader: (5)

Blah, blah, blah, blah, blah, blah,blah, blah, blah, blah...Most of the time an amp blows up is due to user error. Paul, you have known better than to post this on here even though I know what you intention was. ****in suck it up, send it to atomic and get it fixed properly. If not then try to do it yourself and hope to God you don't cause more damage. These are not rincky dinck amps that people use for daily. To be honest with you why the **** would you run it at .5homs for daily even if you didn't turn it up? How long have you been on this forum? How many times have you heard stories from vets about NOT doing what you were doing? This is what happens when you don't listen. Take it for what it's worth and send it away to get it fixed properly.

loudgrand

Murilo you haz PM!

DeadlySones

iTrader: (4)

Thanks to all those with positive remarks. I will get through this eventually.

Brother.. I know you got a family and are also back in school... fortunately you and your wife have decent paying jobs... you have stated so previously in some other thread...

I have 3 kids, a mortgage and bills too. Only I'm a full time student and have no job. I still owe almost $2k to tuition for this year... which I must pay myself.

So, regardless of what I did to it (which I never said anyones fault but my own), realistically I won't be able to afford to fix this thing till tax time. Which is sad, seeing as I have no other amp. This is why I'm saying my only option is to fix it myself.

So, hopefully, with some help, I will be able to do that, and learn a few new things along the way. I have many tools for doing this sort of stuff. I've played with electronics for almost 20years taking them apart, troubleshooting and repair. My deceased uncle did this **** for a living and was very good at it.

So as much as I'd love to build a lil crate and ship it off... thats not an option for me.

Father Yuli

iTrader: (17)

ya replacing all the FETS is probably a good idea.

DeadlySones

iTrader: (4)

The twins are sending theirs out for repair... man I wish I had their money, lol.

Tubeamp

Good for you, keep up the good work!

Perhaps take it into your lab and have the prof. check it out?

One thing to note. If this is a common fault to this model number amplifier. Perhaps something in the parts used is ultimately causing it to fail. If this amplifier is a mass produced unit, sometimes the people/person putting these things together sub out different parts they have laying around. It happens for many reasons, if the client company isn't diligent in their own QC things can slip undetected. Check the service manual for all the proper resistor and device values. It's good practice for you anyways...

Hope this helps!