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This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

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There are several hundred people who actively participate here. People come from all different backgrounds and will have different ways of seeing things. You will not agree with everything you read here. Back-and-forth discussions are fine but do not cross the line into rude or disrespectful behavior.

Conduct yourself as you would at any other place where people come together in person to discuss their hobby. If you wouldn't say something to somebody in person, then you probably should not be writing it here.

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Stay close to the original topic being discussed
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To put things in engineering terms, we value a high signal to noise ratio. Coming here should not be a waste of time.
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"PM Sent!" messages (or, how to use the Private Message system)

This forum has a private message feature that we want people to use for messages that are not of general interest to other members.

In short, if you are going to reply to a thread and that reply is targeted to a specific individual and not of interest to anybody else (either now or in the future) then send a private message instead.

Here are some obvious examples of when you should not reply to a thread and use the PM system instead:
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Why do we have this policy? Sending a "PM Sent!" type message basically wastes everybody else's time by making them having to scroll past a post in a thread that looks to be updated, when the update is not meaningful. And the person you are sending the PM to will be notified by the forum software that they have a message waiting for them. Look up at the top near the right edge where it says 'Notifications' ... if you have a PM waiting, it will tell you there.

Copyright and other legal issues

We are here to discuss vintage computing, so discussing software, books, and other intellectual property that is on-topic is fine. We don't want people using these forums to discuss or enable copyright violations or other things that are against the law; whether you agree with the law or not is irrelevant. Do not use our resources for something that is legally or morally questionable.

Our discussions here generally fall under "fair use." Telling people how to pirate a software title is an example of something that is not allowable here.


Reporting problematic posts

If you see spam, a wildly off-topic post, or something abusive or illegal please report the thread by clicking on the "Report Post" icon. (It looks like an exclamation point in a triangle and it is available under every post.) This send a notification to all of the moderators, so somebody will see it and deal with it.

If you are unsure you may consider sending a private message to a moderator instead.


New user moderation

New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.

New users also have a smaller personal message inbox limit and are rate limited when sending PMs to other users.


Other suggestions
  • Use Google, books, or other definitive sources. There is a lot of information out there.
  • Don't make people guess at what you are trying to say; we are not mind readers. Be clear and concise.
  • Spelling and grammar are not rated, but they do make a post easier to read.
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Hewlett Packard 6632A PSU Fan Replacement

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    Hewlett Packard 6632A PSU Fan Replacement

    I recently picked up an HP 6632A PSU, and when I plugged it in, the fan made the most horrible noise.

    I took it out and checked it, and it is a Pabst 12VDC fan. The back of the fan says it takes 2.5Watts at 12V, and is rated to function from 6-15VDC.

    I measured the output from the HP fan header, and it's more like 14VDC.

    What I want to do is to use one of these Noctua fans that is nice and quite: https://noctua.at/en/nf-a6x25-flx/specification . It's 12VDC and 1.4Watts.

    Can anyone here tell me if they think this will be a bad idea or not? The Noctua doesn't outright say that it can handle 14VDC, but I'm thinking it's probably okay. And it's says it takes 1.4Watts input, but I'm assuming that's just a rating of what it's going to draw, and that the fans are not expecting a current-limited supply or anything.

    Can someone tell me if I should be getting a beefier fan?

    Thanks

    #2
    It may run for awhile, but it'll probably burn out sooner.

    An easy fix would be to get one of those cheap LM2596 buck converters and put it between the fan and the HP power connector to reduce the voltage. You could also use 3 general purpose diodes in series, which would drop the voltage about 2 volts.

    Comment


      #3
      Or, if high volume air wasn't a big deal (the 6632A is rated at, what 20V 0.5A? (10W), you can stick in a 24VDC fan, which will run quietly.

      Comment


        #4
        Okay. Thanks for the ideas. The Noctua fans only come in 5 and 12 VDC varieties, so I will have to look for something else or use the diode-drop idea to ease the stress on the Noctua.

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