fuse for Arp 2600 replacement power supply?

[relaax]

Hello there,
The power supply to my Arp 2600 went down, so I am considering powering it with a new bipolar 15v supply from Power One (link below). This one can output 1.5A.
The fuse for the original Arp power supply is rated .5A. Am I correct on the following points:

- I should not allow the Arp to draw more than .5A with the new supply
- To do so, I only need to place a .5A fuse on the AC end

Anything else I should be mindful of?

Any input would be much appreciated. Thanks!

Here is the new supply:
http://www.alliedelec.com/search/productdetail.aspx?sku=70006010

[DES]

I recently repaired my ARP 2600 p/s. The fuse is for the input of the power supply. I suppose you could change the fuse but the new supply should have a recommended fuse size for it. It probably has circuitry to protect itself in the event the 2600 has a failure. I didn't check the specs, but does the new supply have fuses for the outputs?

Wrt your old supply, any idea where the problem is in it? On mine there was a bad tantulum cap ( old tantulums are known for failing), a bad LM723 regulator and the transformer had been damaged, I assume by a previous owner who wasn't careful removing the front panel. Took a while but was finally able to get a replacement transformer.

[relaax]

Thanks - for 120v, it recommends a 1 amp fuse for the input, which they did not provide. No fuse (or recommendations for any) on the output either. It does say there is an over-voltage protection. My concern is that in the event or a problem, the Arp might damage itself by pulling more current than it is rated for since the new supply is capable of more current than the old one.

At the moment I'd rather hook up a new supply rather than dealing with the old one.

[DES]

I personally wouldn't worry about it. You could put a smaller fuse in the AC side if you were concerned, however if something is going to fail causing a short (cap for instance) the component is already damaged and damage to surrounding components would most likely be minimal. Usually what will cause damage across a larger group of components is a failure in the power supply itself. You could, if you felt more comfortable doing so, put a 1/2 amp fuse each on the +15 and -15 volt busses and see if they work. I don't recall exactly how much the 2600 draws....for some reason 600ma sticks in my head...but that may be off. If you power up the p/s and the fuses pop, go up in capacity (assuming you know the 2600 is working ok to begin with)

One issue with using a smaller AC fuse is that there is a certain amount of in-rush current that happens when the supply is turned on. So too small a fuse will pop immediately when turned on. You do want to use fast acting fuses, not slow-blow.