Bruel Kjaer Beat Frequency Oscilator Type 1014 Peteniometer Logarithmic Print | eBay
"This is a Bruel & Kjaer Beat Frequency Oscilator which has many uses. It came out of the ALTEC Lansing Accoustic Lab in Anaheim California during ALTEC's hey day. It's in great condition. My father used it to test restored microphones. It comes with a Poteniometer & logarithmic printer with many rolls of paper. My father used the graphing capabilites to record the restored microphone's response to a known standard."
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