Humming 9VAC PSU (C060592-11).. safe?

[Br33d71]

Hi,

 

I recently got a C060592-11 (PL028) for use with my Atari 800. I plugged it in (unloaded) and the thing really buzzes / vibrates.

I'm afraid to hook it up now. I measured 10.4 AC on it, so that should be allright.

 

Thanks for any help on this. I don't want to fry my precious 800....

 

Atari#: C060592-11 / CA017964 (box, Europe)
    "AC Power Supply"
    Type: PL028, Made in U.K.
    Input: 220v~37W 50Hz
    Output: 9v~27VA
    Use with: 400,800,810,822,850,1010,1020,1050,XF551,PCF554

 

Kinds regards, John

 

[archeocomp]

They all hum. I never use Atari PS for my 1050 because of it.

[_The Doctor__]

depends on the humm, a certain amount of hum for all transformers is normal... if it's very loud, that isn't good. The laminate around the wires and core could be rubbing off.... you can normally fix this by taking the the entire transformer out of the case and dunking it windings, plates and all in electronics grade lacquer. The hum is usually the metal plates wiggling around or sometimes loose windings and the plates interacting.

Let the thing THOROUGHLY dry.... this normally protects everything and kills the noise.... another words, it make the chatterbox shut up.

Edited May 16, 2020 by _The Doctor__

[Br33d71]

Hi guys,

 

Thanks for replying. 

 

The hum isn't too bad, but the vibrating.... it's just strange. I have a slightly diffferent model PSU that looks the same but its absolutely quiet. I wanted a second one to power both the 800 and 1050.

 

I heard about the laquer method, but this model cpu has no screws to open it. Anyway, I wanted to know if it's safe to use. Any way to find out?

 

[_The Doctor__]

if the voltage is in the ranges folks stated are good loaded an unloaded, you're more than likely going to be just fine.

[andymanone]

On 5/16/2020 at 5:03 PM, Br33d71 said:

I recently got a C060592-11 (PL028) for use with my Atari 800. I plugged it in (unloaded) and the thing really buzzes / vibrates.

I know the problem, I´ve a couple of these humming 9V PSU´s too...

 

To absorb the vibrations a little, I glued 4 soft rubber feet / felt gliders underneath.

 

Gtx.,

andY

[Marius]

I december back in ... 1987 or do there was this review in the Dutch magazine "Atari Magazine" from the Atari Users Foundation (Stichting Atari Gebruikers). It reviewed the xf551. One of the cons of the xf551 was it's humming psu. And that is the same 9VAC psu. So it can be a common thing.

[Gunstar]

I have Trak disk drive PSU that is identical to this Atari "universal" PSU. Sometimes it starts humming louder than normal, I merely tap on it and it quiets down. I've been using it with my 1050 for years in this condition without issue. But I have 7 Atari universal PSU's and they all hum, it's how I know they are working without powering something up. Almost all power packs hum, if you hold them up to your ear, at least the legacy PSU's.

Edited May 21, 2020 by Gunstar