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DCP going south??
- Thread starter roccus
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This is what I ordered for load resistors...
http://www.ebay.com/itm/191527772334?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
http://www.ebay.com/itm/191527772334?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT
- Joined
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- Joined
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- Halfbiass...Electron Herder and Backass Woof
- Joined
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Sorry for the WTF...... But I'm trying to figure out your troubleshooting path. Yer saying you crank the amp to max for hours, blow up a 301 (which by the way, only handles 130 watts ) with a WOPL 400 which can be near 250 plus watts per channel, then you do a drop check to your amp.... I'm trying to figure out why yer trying to figure out why your amp is having issues. Sounds like you already "loaded the crap" outta your amp. I know when I beat the hell outta my first car, I had to disassemble the engine to find the damage. When I had issues with one of my first amps, I disassembled that to do a good inspection. After all, after a sniff test when working on electronics is a thorough inspection. Tear it apart. Inspect (under magnification, check every solder joint, every resistor value, and ohm out every tranny etc...). Don't lead her to a slow death.
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Sure it does. I take every amp I build ....to clip and beyond. I once took a 700 , loaded at 4 ohms to clip , it clipped at 775. I continued upping the input till the AP registered 1kw, which I thought was pretty dsmn cool, had never seen that before. Unloaded testing tells you a lot about how the amp behaves in a high voltage situation, adding a load turns the current up. Which can aid troubleshooting if a problem is current related. Granted, it can be a risk sometimes, and God knows I've blown up quite a few, but things were learned along the way and as a result Joe made some changes and the WOPLs were made more robust In the process.
It can be frustrating for those of us with no formal electronics training or engineering degrees. During 1 400 fix I had actually installed and replaced a total of 72 small signal transistors before I found the problem. That's why I show a lot of patience when helping others, cause I have probably been there and done that. And I have also done testing and replacement between recommendations and failed to inform those helping me of the additional steps taken leading to THEIR confusion.
This "remote help" process leaves a lot to be desired. It is difficult at best to determine someone's ability when they are anxious to get the problem solved and many prerequisites get short shrift. But, it is what it is, and we generally manage to muddle through the problem in spite of the shortcomings.
The one thing I have learned is that shot happens, often repeatedly, and sometimes for the same reason.....
I'm sure he is Ron but you have followed this whole build from start to now and have seen the conflicting advice I have gotten here and there I understand that everyone does things a little different and giving their honest opinion and I really do appreciate their input very much they are trying to help but it is hard to help without having the unit in front of them and I get that at this point I am willing to try anything. But I think what gets lost is previous posts on where I have been with this I have tried to be detailed and when I think I have found something turns out it does not pan out for instance yesterday I thought I had found a way to get the problem to reproduce and I think all will agree if you can't get the problem to reproduce you can not fix a problem you can not find it's like if you hear a noise in your car and go to a mechanic and the noise stops the mechanic can not tell you what is wrong or know where to look if the noise is not there when he listens to it.
I thought I had found a way to make the DCP trip with my TT connected put some bass on and crank it up it did trip first time I was able to get it to trip in 3 or 4 days and I got it to trip a second time right after that so I thought good now that I can get it to trip I can now do some trouble shooting... well I spent the rest of the afternoon trying to get it to trip again and pushed it so hard I blew a speaker never could get it to trip again. It's not like it trips every day or all the time it has tripped using both the C1 and the Pl3000 preamps it has tripped with my FM receiver and my TT so there is no one thing in common that produces the problem.
I was trying to find out some info but I think either it could not be answered or it went over everyones head. It is a logic question the damage seems to have occurred when I plugged the C1 in with bad opamps. So when you put an input into the PL what would be the first component that the bad signal would hit that could be damaged. The problem must be every now and then DC is getting into the output so to me that is 2 big clues as to where a good place would be to look where in the circuit can DC get into the output where is DC blocked from getting into the AC? And this goes back to what could have been damaged from the input that blocks the DC from getting into the AC? The rectifier? But I can not see how the rectifier would be affected from input.
It was suggested I send it out... what they don't understand is I am tapped out going into winter I have a lot of expenses vehicle maintenance, renew registrations, inspection stickers, insurance bill due, fill heating oil tank, a few cords of wood... ect ect. If I had plenty of money I probably would send it out at this point but I don't so I am trying very hard to get it fixed myself I put every spare minute I have into it I am still pouring money into it $5 here $10 there $20 or $30 over there.... I am doing all I can but it is clearly looking like peeps here may be loosing their patience with me. In 2 or 3 weeks I will be closing the shop down for the winter I was hoping I could fix it before then but it is looking doubtful that will happen. I am not ready to give up on it yet but am starting to get discouraged
I thought I had found a way to make the DCP trip with my TT connected put some bass on and crank it up it did trip first time I was able to get it to trip in 3 or 4 days and I got it to trip a second time right after that so I thought good now that I can get it to trip I can now do some trouble shooting... well I spent the rest of the afternoon trying to get it to trip again and pushed it so hard I blew a speaker never could get it to trip again. It's not like it trips every day or all the time it has tripped using both the C1 and the Pl3000 preamps it has tripped with my FM receiver and my TT so there is no one thing in common that produces the problem.
I was trying to find out some info but I think either it could not be answered or it went over everyones head. It is a logic question the damage seems to have occurred when I plugged the C1 in with bad opamps. So when you put an input into the PL what would be the first component that the bad signal would hit that could be damaged. The problem must be every now and then DC is getting into the output so to me that is 2 big clues as to where a good place would be to look where in the circuit can DC get into the output where is DC blocked from getting into the AC? And this goes back to what could have been damaged from the input that blocks the DC from getting into the AC? The rectifier? But I can not see how the rectifier would be affected from input.
It was suggested I send it out... what they don't understand is I am tapped out going into winter I have a lot of expenses vehicle maintenance, renew registrations, inspection stickers, insurance bill due, fill heating oil tank, a few cords of wood... ect ect. If I had plenty of money I probably would send it out at this point but I don't so I am trying very hard to get it fixed myself I put every spare minute I have into it I am still pouring money into it $5 here $10 there $20 or $30 over there.... I am doing all I can but it is clearly looking like peeps here may be loosing their patience with me. In 2 or 3 weeks I will be closing the shop down for the winter I was hoping I could fix it before then but it is looking doubtful that will happen. I am not ready to give up on it yet but am starting to get discouraged
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Therein lies the rub. We also get discouraged and yes, you have gotten conflicting advice, and yes, it ain't perfect, but it is what it is.
At this point I would run it. Rack it up and enjoy it. Of you are running out of shop time and money, a DCP trip every few days isn't that inconvenient.
Some questions we ask MAY SEEM like an insult, but tis better to ask than assume. There has to be a baseline established and a thin skin is not helpful nor warranted, we are not here to ridicule nor gloat nor put down. We REALLY are wanting to help, but we also have other lives and making a living takes precedence ov r r this site at times. So even if things o
Move at a pace you find frustrating, be thankful it moves at all....
At this point I would run it. Rack it up and enjoy it. Of you are running out of shop time and money, a DCP trip every few days isn't that inconvenient.
Some questions we ask MAY SEEM like an insult, but tis better to ask than assume. There has to be a baseline established and a thin skin is not helpful nor warranted, we are not here to ridicule nor gloat nor put down. We REALLY are wanting to help, but we also have other lives and making a living takes precedence ov r r this site at times. So even if things o
Move at a pace you find frustrating, be thankful it moves at all....