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Stooo 18th September 2004 05:58 PM

Xtant 1001DX Output transistors needed
Hi I have an xtant amp that powers on but produces no sound. I know some of the transistors are blown from them being charred. Would it be best to replace all of them or just the ones charred and ones with carbon residue? I went to and found the IRFZ44 part but also do not know which values to get. Also I have to get some SMT resistors for it also and do not know if they are 1205 or 1206 I assume they would come on tape and be fairly cheap. Any help is really appreciated.

clayton 18th September 2004 11:57 PM

I would change them all. More than likely the others are weak and will go before long anyway. Besides the ifrz44's are not expensive. Check out for the parts you need.

Stooo 19th September 2004 03:23 AM

I tried mouser and they only have two in stock I'm thinking mre in the line of 25-30... Tried digikey and they are not in stock there

mike.e 20th September 2004 02:52 AM

check up the transistor reference book to see if you can use equivalent parts
This is often the case.

Stooo 22nd September 2004 01:42 AM

Where can this cross reference guide be found? thank you

mikee12345 22nd September 2004 09:59 AM

Local city library- or technical library

We have one at polytech (electrotechnology courses)

Or you could buy one i guess

hy311dro 24th September 2004 04:30 PM

The surface mount resistors will be 1206 that's pretty standard now

2pist 3rd October 2004 05:44 AM

Go to they have a cross refrence program you can down load. Nte parts are expensive but they are readily available. It also links to pdf tech sheets so you can find your own equivalents. Another good source for parts online is

bkoopman 6th October 2004 03:30 PM

Did you already get this fixed? Let me know - if you haven't, I can answer whatever questions you have, and walk you through testing/replacing (do you have a multimeter, or one you can borrow from someone?) any transistors or resistors. If you need parts, I can also help you with that - we order them in massive quantities, so we can send you some from our stock for much less than you would be able to order them for. We have just about everything, so no worries there - we definitely have IRFZ44 & IRFZ44N (which I believe are also in this amp), as well as just about any resistor, and the quantities you'll need are no problem.

I just have one question - I found a 1001dx here in the shop and took a look in it, but I'm not sure we're looking at the same board. I'm not too familiar with Xtant, so I don't know if there was another run with different boards, but this one doesn't have any surface mount components. Would you happen to have a picture of the inside, or be able to hunt down a picture of it so I can compare?

- Sara

bkoopman 7th October 2004 02:45 AM

Wow, my game is really off. I really just wasn't thinking, didn't become clear until I put it away, so scratch on the resistors thing. Are any of them toasty on your board? If not, you probably won't have to replace them, even if so, I doubt it's more than two or three (we have plenty if you need some). Just whip out your multimeter and give them a measure - the ones on the top side of the board, that are with the transistors, they're 10 ohms, so as long as they read between 9 and 11, they're fine.

I was fairly certain earlier, but didn't want to post without verifying w/ Sergey, but you'll only need 44Ns. The parts are very, very similar, and we've always replaced them as such (in at least 6 or 7 of these) and never had problems. Just make sure that you replace them ALL even if you replace one.

I'm taking pictures and going to be posting all the initial info you need shortly. :)

- Sara

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