Shure TTR-103 test record

FAQ #3083 Updated June 03, 2015

Question:

What is recorded on the TTR-103? When was it discontinued?

Answer:

The TTR-103 was discontinued circa 1975.  It was a 45 rpm recording on a 12" LP disc.

The TTR-103 contained three trackability and distortion tests:

1) High frequency test - 10.8 kHz pulsed with a 270 Hz repetition rate

2) Mid-frequency test - 1000 Hz plus 1500 Hz

3) Low frequency test - 400 Hz plus 4000 Hz

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