Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Thank you for your manual It has the basic things to and i use the Oszi for Longer Time.
THX
Text excerpt from page 3 (click to view)
MD 421-II
Dynamic microphone with cardioid-shaped directional characteristic. Suitable for vocal transmission and miking up instruments in all fields of live sound transmission.
ITS FEATURES
� � � � � � Good feedback and handling noise rejection Transparent sound reproduction Pronounced directional characteristik Robust 5 step roll-off filter Lockable stand holder
TECHNICAL DATA
Frequency response Acoustical mode of poeration Directional characteristic Max. rejection at 180º Open circuit output level Electrical impedance Minimum load impedance Insentivity to magnetic field at 50 Hz Dimensions in mm Weight Delivery 30 - 17,000 Hz pressure gradient transducer cardioid 18 dB - 2 dB 2 mV / Pa (= -54 dBV) ± 2,5 dB 200 � 200 � < 5 µV / 5 µT 215 x 46 x 49 approax. 385 g 1 microphone, 1 stand holder 1 adaptor 3/8" 5/8"