Kate--Lyle's 700 Ser 1 is back..

MarkWComer

MarkWComer

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#22
Gepetto said:
Now you know why I provide the shorty screws in my Backplane Kit Lee...exactly for that reason.
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I left those screws out of my WOPL400 upgrade- too much chance of piercing a wire, especially the AC line to the thermal protect switch.
 
laatsch55

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#24
Joe, I've got a problem with the low negative voltage regulator on a quasi comp Rev C board. I'm getting -30 volts DC with rail voltage of 76. I'm getting + 20 on the other side. I had hi DC offset which took me to the regulator...
 
laatsch55

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#25
The negative TL 431 is acting funny on the diode test, like shorted..(imagine that) the positive tests well on both jct's...


These regulators do test like a bi-polar correct??
 
laatsch55

laatsch55

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Changed out the TL-431 negative regulator, regulated voltage is now - 20.72, and + 20.64 Offset went from 48MV to 10 mv...
 
laatsch55

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Thanks Navo, I get a pretty sinewave through it but I'm not happy with it.My Q10's are running what I think are a little warm. Bias won't go below 330mv either. There is still a problem. I have an out of tolerance resistor someplace...
 
Gepetto

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#29
laatsch55 said:
The negative TL 431 is acting funny on the diode test, like shorted..(imagine that) the positive tests well on both jct's...


These regulators do test like a bi-polar correct??
Click to expand...
No they do not Lee, they are an integrated circuit, not anything like a normal transistor.
 
Gepetto

Gepetto

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#31
laatsch55 said:
Well, they can show a short.....
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You were seeing 30V because the fail safe diodes kicked (D80, D81) in to protect the rest of the circuitry. Those 2 diodes do nothing in normal operation. They protect in the event of the VR1 and VR2 regulators failing to do their job.
 
Gepetto

Gepetto

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#35
laatsch55 said:
????????
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Failure Mode Effects Analysis. You see what will happen in the event of a component failure and try your best to mitigate the failure and keep it from propagating into a cascading failure event. This is SOP for us in HA design.
 
MarkWComer

MarkWComer

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#39
Gepetto said:
Failure Mode Effects Analysis. You see what will happen in the event of a component failure and try your best to mitigate the failure and keep it from propagating into a cascading failure event. This is SOP for us in HA design.
Click to expand...
Further evidence that I have the best amplifier on earth.

What a brilliant person you are!
 
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