The Phase Linear 400 Guinea Pig

Gepetto

Gepetto

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Gepetto said:
Hi Lee
I think you are looking at an A or C board. Both of those boards had the trace on the topside.

There has been only one run of RevD boards ever produced and there is one topside and one bottomside trace in this location on the RevD board and artwork.

Are you experiencing a problem?
Click to expand...

Can you double check Lee? Every Rev D board I have has the connector trace topside on the R channel and bottom side on the L channel. Twilight Zone...
 
laatsch55

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So, the Pig got toatsed tonight, I HAD NOT, fixed it to Joe's latest iteration of moving wire #3 from pad 3 to the fused B- tie point and damn sure when it popped a rail fuse it took Q7 with it, along with the Pico. Joe, I think we can pretty well put that failure mode to bed. I will finish the Pig in the morning and let Timdalf have his way with it again so I can upgrade his Quasi 400 with new 96's. My god I looked at the back of his 400 and it still had the XPL's in it. And we were treating it like it was bulletproof and no DC protect. Got lucky and nothing went....

Wounded the big Carver somehow, it clips at less than 400WPC now so some outputs had to be gone.

His Soniphase S6's are now driven with one amp and running Al K's universal crossovers, sounds much better. Thise folks who said getting a tri-amp setup to sound right is hard weren't just whistling dixie. The problem with this setup was the fact that once you had things setup to sound good at one level and you kicked it on up a hundred DB things would not be proportional as the level increased. It's a case of matching sesitivity, amp response and efficiency, and it's damn tough. I don't think we were even close at times and it kept changing every time the output level changed. Too big an amp on the mids, a quasi 400 and just as you got the woofs woke up the mids were parting your hair. very frustrating.. The answer is there somewhere, just gonna take a ot more work, and IT AIN'T EASY. A lot more factors than I had thought are involved and I still don't know what to do to solve some of those problems.
 
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Gepetto

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laatsch55 said:
Vented the 47uf caps on the backplane board too...
Click to expand...
I don't know how you do that Lee...those are just bypass on the +/- 80V rails. That indicates that you had a severe overvoltage event OR that these small caps absorbed all your ripple current.

Do you have photos?
 
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I can have Joe. I've got some packing to do for stuff I have put off way to long. Got a package going t Ed, Mark and a couple other fellers. When I'm done with that Joe, I'll open the Pig up. I think it's a reverse voltage event...
 
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laatsch55 said:
I can have Joe. I've got some packing to do for stuff I have put off way to long. Got a package going t Ed, Mark and a couple other fellers. When I'm done with that Joe, I'll open the Pig up. I think it's a reverse voltage event...
Click to expand...
Take your time Lee, no rush.
 
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Gepetto said:
I don't know how you do that Lee...those are just bypass on the +/- 80V rails. That indicates that you had a severe overvoltage event OR that these small caps absorbed all your ripple current.

Do you have photos?
Click to expand...
Quoted from Werner von Braun. Anything manmade can be destroyed by man.
 
NavLinear

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Only you could blow those Lee. :laughing1: Did you have to cut the leads of the caps and then remove the rest of the lead from the board? That would seem a lot easier than the alternative.
 
laatsch55

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Indeed that is the procedure, done it once before...It also took out Q7 on the right and BOTH B- pico fuses..
 
laatsch55

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The Fine golds in the middle?? Don't know yet Joe. Just got the Q7 out and the pico and cap holes cleaned up. Headed north...

Q7 was shorted B-E, and B-C
 
laatsch55

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I think so Joe, with the b rail fuses pulled I'm showing 86.75Uf which would be right if both are good...that is betwee, the hegative lead on the hegative lead of the poly cap beside it and the B+ rail test point..
 
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