What you do is read the voltage you want from the device, turn the knob to the voltage you want and plug it in!
It was made in 1977. It works like the day it was bought i.e perfectly. I don't imagine a cheapy switch mode supply making it to 35 years old.
With regards to the "sweet DC juice" - it'll be full of noise if it's a switch mode supply. They're horrible devices that cause all sorts of local RF interference, noise and transients on the mains. Sometimes more than chucking an inductive load like a hoover on the line.
The only positive things is that they are small and cheap. They are definitely not good.
Also a switch mode supply does have a transformer! Just a small one.
It's terribly useful.
What you do is read the voltage you want from the device, turn the knob to the voltage you want and plug it in!
It was made in 1977. It works like the day it was bought i.e perfectly. I don't imagine a cheapy switch mode supply making it to 35 years old.
With regards to the "sweet DC juice" - it'll be full of noise if it's a switch mode supply. They're horrible devices that cause all sorts of local RF interference, noise and transients on the mains. Sometimes more than chucking an inductive load like a hoover on the line.
The only positive things is that they are small and cheap. They are definitely not good.
Also a switch mode supply does have a transformer! Just a small one.