37-series

In 1960, RCA announced the Compact 33 double and singles. In January 1961, these discs hit the market. The Compact 33 discs were released simultaneously with their 45 rpm counterparts. The long-term goal was to phase out the 45 rpm. This campaign eventually failed by early 1962.

Range	Front	Back	Details
No 1 . to .
	Cut straight/notch	Inside glued