Offered today is a Bruel & Kjaer Vintage Microphone attached to an Environmental Noise Classifier Model 166. This appears to be an analog instrument although it does have what looks like an RS232 port. It seems to work as the light goes on and the the number change although I am not sure if it works properly. It was last calibrated in 1982. I've reviewed the technical data sheets on B&K's website and have not found this specific model described. It does look a lot like the B & K Statistical Distribution Analyzer Type 4420 which connects to the Level Recorder Type 2305,  1964 (link). I believe this device was discussed in "JAES Volume 22 Issue 7 pp. 528-532; September 1974 An Environmental Noise Classifier and Its Use" (abstract)

    Bruel & Kjaer has been an innovator in Sound, Environmental Noise and Vibration monitoring and calibration (link).  They bought Western Electric's calibration microphone division shortly after Altec took control.


    Postal Policy:

      The only postal option offered is the United States Postal Service, Priority or Express mail.   

      International postage will likewise be provided solely by the USPS but surface mail options are not provided as the delay in delivery often results in disputes and anxiety on both ends. For all international orders using Express Mail, the buyer must supply a phone number.


    eBay Policies:

      No Excessive Negative Feedback.  I participate in the eBay community by honestly giving feedback. I you have 0 Feedback or Private Feedback, Please contact me prior to bidding.

      I reserve the right to cancel any bids for any reason.

      Email for questions and/or customized transactions.  

      Payment options include PayPal  from verified accounts only, otherwise a Postal Money Order may be requested.

      I do not accept personal checks.

      International bidders may pay using PayPal only.

      Payment is expected within 5 days of sale.

      After 7 days of non-payment, the transaction is voided and a non-payment is registered with eBay.

      Returns are honored within 5 days of receipt if the item has been misrepresented. Insurance may be required on returned items.

      I do not respond to after auction offers.

The buyer is permitted to use any of my photographs for any commercial or noncommercial application