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Re: HP5335A fan replacement

 

I've read that HP sized its fans to cool the instrument even when operating at maximum outside air temperature. If that is true, one might get away with less airflow if ambient temps stay closer to "normal room temperature." My two 5245-family counters are definitely in need of quieter fans. I've thought of replacing the stock 4-inch fan with a 3-inch fan mounted on a heavy rubber sheet. The sheet would provide mounting, air control, and vibration isolation. Obviously that would not work on smaller, newer instruments that use a 3-inch fan to begin with.?
---Jeremy


On Sun, Mar 24, 2019 at 2:34 AM Andy ZL3AG via Groups.Io <zl3ag=[email protected]> wrote:

Would this be a situation where the best option would be to use some CPU cooler fans to direct local airflow to the hot components, allowing quieter fans to do the job in the back frame?

On 24/03/19 6:12 PM, Dan Nessett via Groups.Io wrote:
> I have looked high and low for a 80x80 fan that has equal airflow and lower noise specs that the fan already installed in my HP5335A without success. Given the comments by Joe / KN5U that many of the units he has repaired had replacement fans with lower airflow specs and failed Schmitt amplifiers (parts that are no longer available), I have decided to stick with the (noisy) installed fan.



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