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Old 26th January 2007, 11:36 PM   #1
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Default Repair question re: threshold 400a

I just recieved a used broken unit I bought on ebay. The repair quote was $900. I foudn the quote inside; it reads:

24 Outputs $480 (is this a joke? they are like $2.00 each!)
4 Diff Ic's $80
8 drivers $50
10 resistors $10
10 caps $5.50


Labor $300

My question: If I replace all this would the only adjustment be bias? Can I do this?
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Old 27th January 2007, 12:14 AM   #2
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There's a lot you can learn from something like this, but it will take courage, persistence and money.
As for the parts prices, you're looking at buying, say, 100 devices and matching them. There will be a certain number that won't make the cut. For your immediate purposes, they're waste. (Longer term, you might find yourself using them for another project.)
That said, $20 per output device would certainly annoy me.
The final choice is yours. If you fix it yourself, that's fine. If you have someone else fix it, that's fine, too. The crime would be to let it sit gathering dust, unfixed by anyone.

Grey
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Old 27th January 2007, 01:53 AM   #3
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I can install parts.. but as for matching.. no way.. I have no scope for starters.. Maybe I should just solder all the wires back on that the repair guy left undone and bring it in.. just so the guy isnt pissed that someone left it in a mess. I cant imagine it would cost more than $400 to fix.. this guy was a real jerk for wanting $480 for all 24 power transistors.. no to mention how likely is it both sides got taken out???

One side got so hot it burned all the anodization off the the heat sink!!!! One fuse assembly has a huge resitor burned off of it!

My unit has internal fuses as well as external.. this one I do not think has them.. hmmmm
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Old 27th January 2007, 02:11 AM   #4
anatech is offline anatech  Canada
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Hi barchetta,
Grey has a point, a very good point that you missed.

Firstly, do not do anything. The tech wants it in that state. It will cost you more if you play with it. Rightly so.

Second, how do you figure you can price it when you do not know what you are doing?

Third, you should repair it (properly). Buy and match all those parts. Buy the equipment you need and spend the time. Let me know once you are done if the job wasn't worthwhile. That tech has a family and has to eat and live. He can not charge the labour at cost. I'm betting that you spend more if you get it fixed.

I'm not saying the job is a little high or not as I can't see what shape it's in. Pictures will not tell me everything either. I can tell you this amp will take the guy a day to do. He has overhead and he is not taking home the labour. If he's lucky, he'll take home $100 for the day's work less taxes. That's if he's good.

-Chris
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Old 27th January 2007, 02:21 AM   #5
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I can price a power transistor.. 24 of them are not $480.. this did NOT include labor.. I repair computer networks and I have to eat as well.. I dont need to be preached to about labor.. thanks. If someone would like to prove me wrong; fine.. but I saw them for $1.80 each.. If they are $5.00 each it still isnt right.


This amplifier is simply not worth $945. Period. I can buy a working unit for $800 and in fact mine cost $840... So there comes a point where it makes no economical sense.. which pretty much makes your point about it costing more a non-issue. Sorry; but your labor or even Mr. Pass's labor for that matter is not worth any more than I can replace it for.. okay; maybe that was a bad example; as if he repaired and signed it it would indeed be worth more.. Funny thing, my repair guy told me the same thing when we spoke.. cool guy.

Now, if this means it collects dust.. so be it.. I have some potential spare parts if needed; or it may become vintage one day and a repair more economically feasible.. I bought it knowing it may just get shelved and I am fine with that.


I will concede; the labor seems low for all this work.. so maybe he was just padding the parts..
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Old 27th January 2007, 02:31 AM   #6
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I'd rather not get any further into the "what's a fair price" debate. I'll leave that for others. I have Scottish ancestry and everything seems too expensive to me; my viewpoint is biased.
It appears from the picture that the unit has been serviced at least once before. Note that the two main power supply caps are different colors.
As for the heatsink and anodizing, bear in mind that long term exposure to sunlight will do a number on black anodizing. It fades over time.
I'm not trying to be mean or anything...just wondering...if you knew the amp was toast...and knew that you didn't have an oscilloscope...and knew that it would need matched parts to repair it, etc...why did you buy it? Perhaps I missed a post on this somewhere, but I'm not sure I follow what the game plan was supposed to be.

Grey
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Old 27th January 2007, 02:48 AM   #7
anatech is offline anatech  Canada
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Hi barchetta,
Yet another computer guy!

Yes, I am being sarcastic. This is because I recognized your dismissal of any skill required to do this job. I have an acquaintance that sounds just like you. He is a systems programmer and fancies himself a hardware guy. I haven't talked to him in years due to this.

You should give this amp away without touching it and head to BestBuy for a feature filled unit unless you get past the tone and read what information you have been given thus far.

If you are still with me by now, please read.

You need to buy first rate parts, not the cheapest. If they are second source you need to buy the current part. $2.00 they ain't.

You are not buying 24 transistors. I can't remember what the part number is off hand, please refresh my memory. Anyway, you are buying in excess of 48 transistors. Then you are matching these by hand.

You are ordering these parts from probably two to three vendors. You have to figure out where. You have to match other parts as well

Once you have got everything you need to clean the old boards and heatsinks up, then remount the new matched parts with ............
Oh yeah. Proper new heatsink grease and new mica insulators. Once the new parts have been assembled and the correct torque (you didn't know ??) and soldered in the proper order, you can install the other bits. Now it's time to test and make sure there are no other problems. Hate to see all those new parts get fried. Oops!

So now you have it running. You do not know if it's oscillating and can't troubleshoot because you have no 'scope. Do you have a good meter? I mean actually good for electronic servicing, not testing batteries?

Now assuming you've done a good job and it's running, how long did all this take you? What is your time worth if you were fixing it for someone else?

Now for that old $800 amp you were going to buy that needs service. It's no spring chicken and this one would be like new pretty well. What did you pay for this one BTW?

One last thing. I do networking as I'm the VoIP guy. I program and install telephone systems. I also repair computer networks. Dead easy compared to some amp problems. Dead easy compared to a good telephone system install and program. Do not sell a tech's skill and knowledge short. That is my "button" and you're pushing it.

-Chris
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Old 27th January 2007, 03:47 AM   #8
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It's kinda odd. If I go back and trace the individual posts, I can see the actual process of people getting heated up about this, but if I just read the last few posts my eyes blur and I'm no longer clear about how this got to be so emotional. It's a perspective thing, like the box drawn on a piece of paper--does the box go into the piece of paper or does it project up out of the piece of paper?
Oh, well. Things are where they are and that's that.
As I see it, these are the options:
1) Get rid of the amp. If no one else will take it, I've got a couple of Thresholds that would like the company.
2) Keep the amp and let it collect dust.
3) Keep the amp and dismember it for parts.
4) Have the amp fixed for the $900 asking price.
5) Shop around for a cheaper tech.
From my perspective, #3 is a crime. Option #2 is a somewhat lesser crime.
Options #4 and #5 are going to get back into the "how much is fair" and "is this tech any good" arguments. I'm going to stay out of that.
Option #1 depends on who ends up with the amp. It's like a puppy...like it or not, you have incurred an obligation to pass the amp to a loving home should you decide to put it up for adoption. This isn't some POS receiver you've picked up in a pawn shop, it's something with a bit of history about it. Something a cut above.
Sleep on it. Several nights, if that's what it takes. Think before taking further action.

Grey
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Old 27th January 2007, 01:06 PM   #9
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"If you are still with me by now, please read."

I stopped right there and didnt read another word.. All your typing, thought was a waste.. looked like several paragraphs. Post again, but I will look for your name and skim right past.. see, I have learned over the years that I do not waste my time with useless information.

I've already answed the question as to whether I knew this was a broken unit.. this will be the 4th time.

I have decided I will attempt fix the unit myself.. albeit with no help whatsoever from this group.. I am very tenacious and tend do do things people say I cannot.. example: the 1969 Porsche 911t I am fully restoring myself.

If I cannot fix it; it will be a parts bin.. and it doesnt matter to me if you guys like that or not.. not even on little bit. The $300 I paid for it is nothing to me.. Might as well have been $3.00.

Anyway, this is an odd group here.. sounds like a bunch of old ladies with nothing else to do. Some is entertaining however; like this thread... Actually this thread was a complete waste of time for me.
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Old 27th January 2007, 01:55 PM   #10
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Quote:
Originally posted by barchetta
"If you are still with me by now, please read."

I stopped right there and didnt read another word.. All your typing, thought was a waste.. looked like several paragraphs. Post again, but I will look for your name and skim right past.. see, I have learned over the years that I do not waste my time with useless information.

I've already answed the question as to whether I knew this was a broken unit.. this will be the 4th time.

I have decided I will attempt fix the unit myself.. albeit with no help whatsoever from this group.. I am very tenacious and tend do do things people say I cannot.. example: the 1969 Porsche 911t I am fully restoring myself.

If I cannot fix it; it will be a parts bin.. and it doesnt matter to me if you guys like that or not.. not even on little bit. The $300 I paid for it is nothing to me.. Might as well have been $3.00.

Anyway, this is an odd group here.. sounds like a bunch of old ladies with nothing else to do. Some is entertaining however; like this thread... Actually this thread was a complete waste of time for me.

I think that in every language exist adequate pronounce for your too touchy attitude

re-read thread;
re-read your first post ,and you'll certainly conclude (if you can stay to be objective) that you give only facts that you are clueless in most important areas in fixing that sort of amp.



regarding 911 refurbishing- in my neighborhood - even little child can do this.........with same amount of childish behaviour

if you wanna help-sometimes you must be prepared to be given with various opinions . that's life.
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