The Phase Linear 400 Guinea Pig

laatsch55 said:
The Pig is fixed.....Both Q7 R and L were gone, both B- pico fuses, and the + rail 47uf 100 volt cap, on the left BP board...
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Did you move the wire while you were in there Lee? The pig is full comp correct?
 
Yes Mr. Joe.....evidence presented herewith..
 

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D14 was suspect, but only because i hadn't swapped out Q7L yet. No outputs wounded, even after shorting the chassis to the B- rail by way of the soldering iron before discharging the caps.....the B- rail on the left BP board upstream of the burnt pico...
 
Kev, send a closeup of the sub amp so I can see if there is anything exotic I'll need....
 
laatsch55 said:
The Phase Linear 400 Guinea Pig
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DSC_8247_zpseed5e657.jpg




sorry, couldn't resist...
 
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That's choice Bud. Does that one snicker behind your back, like this one?/
 
The Pig has this scope trace.....I'm guessing that Q7 and the pico fuse is gone...
 

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Of course, he was the 2nd and subject to a few blowups that one week when you decided to go to the fused B- hook on the backplane..
 
laatsch55 said:
Of course, he was the 2nd and subject to a few blowups that one week when you decided to go to the fused B- hook on the backplane..
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Got to blow shit up to make it right in the end

OR

If it don't blow up, your not really testing it?

:mrgreen:
 
I've got -11.52 volts on the collector of Q9. D9 is good, so i've leakage through Q9?
 
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