kato
Well-known member
Well worth the 6 minutes it will take you to watch:
http://recordinghacks.com/2012/10/25/making-of-an-aea-r44-video/
http://recordinghacks.com/2012/10/25/making-of-an-aea-r44-video/
The resonance decides the LF cutoff of the mike. It's done by measuring the impedance and looking at the ribbon with a microscope. Resonance is determined when current & voltage are in phase which is the straight line on the scope. Yes, ribbon vibrates more at resonance. You can't put too much voltage into the ribbon cos it will stretch. The microscope is probably checking for that rather than the resonance which is much more accurate from the scope display.dmp said:.. talk about an electrical test to check the tension of the ribbon. In the Royer video, check the frequency of resonance. What should the frequency of resonance be? Does the ribbon vibrate noticeably more at the frequency of resonance?
The ribbon has resistance less than 0R2 so any generator will have MUCH greater resistance and be effectively a current source.dmp said:I'd like to try this - but how to measure the voltage and current?
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