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Crown DC300A Oscillating
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Have you taken notice of this little ditty about C119/ C219?
DC-300A-C119_ C219.pdf
"Used Only If Oscillation Occurs During Test"
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The parts list shows different caps for C107/ 207, depending on the output transistor grade.
(Crown is big on graded outputs)
Certainly Not an easy amplifier.
I would contact Crown.
They have been most helpful to me in the past.
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Crown DC300A Oscillating
I have a DC300A on the bench that one channel was folding the top half early into a load. I couldn't get the original 2N5804 driver transistors, so I used a pair of MJ21194 transistors as replacements. I adjusted the bias for that channel, and it has no DC on the output. Now the amp goes into a big oscillation as soon as it clips into a load. I added a 200pf compensation cap as C119, which is shown on the schematic, but that didn't help.
Do I need to pay big bucks for 2N5804's to make this work correctly?
Or should I replace all of the output devices with MJ21194's on that channel?
Or just try compensating caps elsewhere?
Service ManualTags: None
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