power supply replacement

[_THEON_]

Hi everyone,

i have an old device with separate power supply which i would like to replace since it does look very worn down and humms.
Since i dont have a datasheet, is there a way to know the max amp rating so that i can find an fitting replacement?
I measured +/- 12 volts at the outputs with multiple +12v and ground connections. Is it safe to assume they are the same?
Further more, there seems to be a floating pin connected to the frame.
Are there any other things that i should look out for?

Thanks in advance.

[ocset]

to replace the power supply.....can you borrow a bench power supply.?..set it up for +12/0/-12  output and hook that up to your device...then measure the current in the wires to it...and then from that work out what power is used...then buy a power supply of that power level or  more

[_THEON_]

Sadly my power supply only has a single output, so i can't provide +12/0/-12 

[Jay_Diddy_B]

Hi,
Does the original supply have any labels on it?

Can you tell us what is being powered by this supply?

Can you tell us the manufacturer of the equipment?

Regards,
Jay_Diddy_B

[radix]

You can try to work out a very approximate upper limit based on components that are in there.
I can see a 2.5 mF electrolytic and a C 5000/3000 bridge rectifier. If I recall correctly, the bridge rectifier is rated for 5 A/3 A and the electrolytic would imply something between 0.5 A - 1 A, or more depending on which rule of thumb you follow (these numbers are for 2-4 mF/A).

[_THEON_]

Thanks for your replies.

I have no information on the device since the manufacturer is no longer around.
The supply drives a CRT.

[vk6zgo]

Thanks for your replies.

I have no information on the device since the manufacturer is no longer around.
The supply drives a CRT.

By "CRT" do you mean the entire monitor ?
"CRT" normally refers to the big glass device that your display appears on.