Seems like I read in this thread of someone who used a high current opamp in their D30 and later the D30 died (too lazy to dig for it). To that person I would suggest checking the negative voltage to the opamp. The D30 has a built in voltage converter that takes +15vdc in and converts to -15vdc so the opamp has +-15vdc which allows for it to run at very good specs.
This voltage converter is built of discrete parts and seems fairly robust except for its diodes. If you don't measure -14vdc to -15vdc or so and instead measure around +1.2, its probably the diodes. They are surface mount but you can take them out and use 1n918 or 1n4148 (Radio Shack) with very short leads and just solder to the pads where the surface mount ones were.
I thought I bricked a new D30 when I was changing opamps back and forth after socketing...it died when I switched it on after a change and when I picked up the naked board there was an allen wrench under it...it had shorted out and I quickly discovered the above described and had it going again in 30 minutes. Excessive current on the negative rail from using a high current requirement opamp could cause the same failure. The audible symptom is low volume, highly crackling sound where you can still recognize what material is playing. Worth a shot to check it.
This voltage converter is built of discrete parts and seems fairly robust except for its diodes. If you don't measure -14vdc to -15vdc or so and instead measure around +1.2, its probably the diodes. They are surface mount but you can take them out and use 1n918 or 1n4148 (Radio Shack) with very short leads and just solder to the pads where the surface mount ones were.
I thought I bricked a new D30 when I was changing opamps back and forth after socketing...it died when I switched it on after a change and when I picked up the naked board there was an allen wrench under it...it had shorted out and I quickly discovered the above described and had it going again in 30 minutes. Excessive current on the negative rail from using a high current requirement opamp could cause the same failure. The audible symptom is low volume, highly crackling sound where you can still recognize what material is playing. Worth a shot to check it.
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