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One of my beloved 414 EB's - with the brass diaphragm ring, has developed a hum in the cardioid position.

I can use it in hyper cardioid and omni without any problems, but both Fig 8 and Cardioid are producing what must certainly be a ground issue.

I don't think that this is a diaphragm tension - related issue, as it sounds crystal clear in hyper cardioid and Omni... I'm thinking it could be the polarity switch ?

Does anyone here know anyone who works on vintage mics - and who can be trusted to not send this Vintage EB back to me with one of the newer teflon-ringed diaphragms?

Comments

dvdhawk Fri, 07/18/2014 - 06:19

No need to PM I see he's got a public website these days.

[="http://www.akgmicrepair.com"]Land[/]="http://www.akgmicre…"]Land[/] [[url=http://="http://www.akgmicre…"]Audio[/]="http://www.akgmicre…"]Audio[/] in the Nashville area is owned and operated by a guy who was top dog at AKG for years when they were headquartered in Nashville. Highly, highly recommended for all things AKG.