Universal Frequency Recorder D61A

The new pressing of the D61A frequency check record offers "double value" over the old, being recorded on two duplicating sides. Designed for direct checking of the response characteristics of phono pickups, lateral disc recording and reproducing systems, it is populary used also for checking amplifiers, loudspeakers, room acoustics, etc. On a 12 inch Vinylite 78 RPM disc, it covers from 50 to 10,000 cycles in three volume steps, each identified, then produced 1000 cycles in 6 steps of 2 db, and finally 400 cycles at steady 18 db.

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