Federal Signal NYC EMS Federal signal PA170

I don't know if I'm doing something wrong. When watching this video, the audio cuts out at 0:04 and resumes at 0:50.
 
I think you have it confused with the PA70 and PA100, both of which were introduced around 1972-1973. They were control heads with remote amplifiers.

The PA170 was introduced in 1979. It's a 'flush mount' version of the PA200.
 

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