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Old 18th February 2011, 09:25 PM   #1
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Default Orion 2500d weak output

Amp's ran fine for 4 or 5 years now, 2 days ago I was playing some tool, when the bass dropped out significantly, Got the amp apart today, cant find any issues with it, the 7812 and 7912 produce there + and - 12v, nothing but the driver cards gets warm, I measure about 15mv dc on the speaker terminals, adjusting the pot on the audio driver card varies this, but produces no change in output or idle current draw (about 2.5amps idle)
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Old 18th February 2011, 09:56 PM   #2
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Did the bass drop and remain clean or did it begin to distort well before it generally does?

Have you checked the speakers?
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Old 18th February 2011, 10:03 PM   #3
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Hi,
Did you tried another input device?
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Old 18th February 2011, 10:11 PM   #4
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It dropped and remained clean, tested a different input device, speaker is a orion hcca 12.2, pulled the soft parts out just now and inspected, no issues with the speaker, tested another amp in the 2500's place, all is well.


I think I can hear a faint humm, but it could be hashing noise from my bench top power supply.
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Old 18th February 2011, 11:42 PM   #5
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Confirm that all of the output transistors have full rail to rail swing on the drains.
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Old 19th February 2011, 12:04 AM   #6
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105v across the rail totals, individual variances from the tranfo's secondary, referencing CT is about 50~55v with a input range from 13.8 to 15.1v
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Old 19th February 2011, 01:17 AM   #7
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Do you have rail to rail oscillation on ALL of the output transistors?
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Old 19th February 2011, 03:12 AM   #8
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Ill check that in the morning!
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Old 21st February 2011, 06:47 PM   #9
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Db-r was not interested in fixing this amp, I was not interested in sending it to amp medics, so he called me a *******.


Ill sit it on the shelf and buy a sundown 4500 to replace it.




And wont bother Db-r again, He's just to busy to help these days.
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