GlennP Posted July 4, 2016 Report Share Posted July 4, 2016 Stripdown of an AKG CK91 Blueline cardiod capsule. I bought tge CK91 and SE300b off ebay for a good price but in receiving it the output was very low and with little or no HF in the signal. It was also very susceptible to pops and breaths. The capsule seemed to charge up giving reasonable output but then fading away. Not much inside the thing. Thought I d post just for interest. I quite like the blueline series but low output and self noise very apparent. Prefered to the Oktava Mk 012 I also have but even that seems like a 'hot' mic compared with the AKG. The membrane part is not taught and has some ripples in the surface. Possible cause of issues. I ve not tested the pcb yet but will do when time allows. Quote Link to comment Share on other sites More sharing options...
Eric Toline Posted July 4, 2016 Report Share Posted July 4, 2016 Seems the capsule has lost it's ability to hold a charge most likely due to age. Don't think AKG still supports the Blue Line system. Quote Link to comment Share on other sites More sharing options...
thunderfm Posted July 4, 2016 Report Share Posted July 4, 2016 AKG should still be doing the blue-line. It's still a current range on their website and I bought a couple of omni capsules brand new about a month ago. Quote Link to comment Share on other sites More sharing options...
NBJersey Posted July 5, 2016 Report Share Posted July 5, 2016 You can still buy the capsules and they are well priced. Thomann.de keeps stock but I don't know about a US supplier. I'm sure they would ship internationally. I have a pair with the cardioid capsules that I use for stereo music recordings and they sound great. They are my favourite acoustic guitar mics too. Quote Link to comment Share on other sites More sharing options...
ramallo Posted July 6, 2016 Report Share Posted July 6, 2016 You need a new capsule, just the capsule (not all the assembly) part: 2439Z0001. My advice, never touch without rubber gloves the brass rod, this might result in a permanent discharge of the electret element. Sometimes the low output are a problem with the fet board (part 2439M1101) http://cloud.akg.com/8393/ck91_92_93_service.pdf Quote Link to comment Share on other sites More sharing options...
GlennP Posted July 7, 2016 Author Report Share Posted July 7, 2016 Thanks for the replies and advice. I did touch the brass post with bare fingers but the mic was already bad at that stage. Obviously I ll use latex gloves next time. I ll try AKG UK to see if they have the element in stock somewhere. I have the CK93 and CK91 capsules on another mic and wanted a cardioid stereo pair. Got a refund for the capsule from the seller. So I have 2x SE300b pre amps and the ck93 and ck91. I actually was after a ck94 figure 8 for MS recording with my 416 although I feel I may well be disappointed by the noise/output of the AKG in combination with the Sennheiser. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.