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Post by mcirish on May 30, 2023 8:58:12 GMT -6
During two sessions this last week, I've lost two channels of my Daking Mic Pre IV. Channel one is completely dead and channel three is noisy. Any of you have schematics or any knowledge of common issues?
On a good note, the Stam that I had so much trouble with held up just fine during done vocal sessions.
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Post by mcirish on May 30, 2023 14:54:37 GMT -6
Contacted them to get an RMA. Too many problems once we got it on the bench. All four channels have various issues: oscillating, noise or dead.
Odd that all the problems began in the last week. No power spikes of anything like that so I'm a bit puzzled.
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Post by ironinthepath on Jul 3, 2023 9:48:51 GMT -6
Were the problems resolved? It would be interesting to know what failed and possible root-cause
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Post by mcirish on Jul 4, 2023 8:25:16 GMT -6
Were the problems resolved? It would be interesting to know what failed and possible root-cause Two transistors and a fuse on channel 1. They didn't find any problems with the other channels, which is a bit odd, but I have used it on a couple sessions and it's ok so far. I don't know where those transistors are in the circuit. It's not an easy preamp to work on. It's packed pretty tight and I was unable to obtain any schematics. Turn around was three weeks. I'm glad to have it back. It's my best preamp for ribbon mics. It has plenty of gain. |
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Post by ironinthepath on Jul 5, 2023 9:22:04 GMT -6
I have been eyeing the two-channel version for a while, mainly the "T" version with output transformers. I think these are standard on the IV though. If your unit has been in use over a long period of time it's not impossible that an aged transistor just bit the dust, taking another with it and the channel's fuse isolated the problem.
Do these pres get pretty hot with the four channels? If so, it might be good to leave space above and/or below it for more airflow.
Does yours have the concentric pots for the adjustable HPF? (I think this is the most recent release of the IV)
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Post by mcirish on Jul 5, 2023 11:02:07 GMT -6
Mine is the first version. It has the transformers but no HPF. I always HPF as the first plugin on most every channel, so the filter is of no interest to me. It does get warm, but I think it uses the chassis as it's heatsink. Nothing outrageous. Could have been age/heat related or just a flaky component that finally gave out.
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