16 ohm then.Speaker reads 13.3 ohms on my old Beckman. So maybe 16 ohm. Or 15.7
when I have time later this week take board out and if it's an ic find reference to what is connected to the pins .
Pin 1 is B+ pin 8 is B-
Pin 5 output wired direct to the speaker
The unit is made in 1977
I have had this for a while..
I have not turned it on.
I open old electronics up do a visual then power up slowly..I'll replace the speaker with a 15 ohm resistor on initial test.
I did test the speaker on another audio unit works good.
Most likely caps are bad.
I notice the 2 large caps have Grass name on them