Re: AKG C60 valve mic
Hi
I assume your C60 has N60A power supply. The valve heater is powered from a regulated 4volt power supply. As mentioned in the previous post, and given the age of this unit there are quite a few electrolytics that may need replacement. Attached circuit for reference. I hope it is legible.
A later AKG SolidTube microphone and power supply came in for repair recently with very severe hum problems. In this instance both HT electrolytics had not only failed but also oozed electrolyte over the PCB.
Cheers
Rich
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