What was the TTR-107 test record?
Created in 1972, the TTR-107 was a 45 rpm recording on a 7" disc. The TTR-107 was designed to test output level and channel crosstalk. Both sides of the record were the same. It was not a consumer test record.
Sine wave signals were recorded at 1kHz with a 5cm/second peak velocity. The record bands alternated between left and right channel recordings. The record label had a strobe pattern for setting turntable speed.
Sorry, the TTR-107 is no longer available.