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I think that the idea is that the rushing air is used to create an electrostatic charge.? There are furnace filters like that.? No idea if it works.? I think what Tek used just made it sticky.

This is probably why a lot of outdoor power equipment that uses a foam-type of filter calls for adding oil to that filter, to catch the dust... -- Member of the toughest, meanest, deadliest, most

At LSSM we've been using this product: https://www.supplyhouse.com/sh/control/product/~product_id=QT2700 Of course the "Turns an Ordinary Filter into an ELECTROSTATIC Filter!" claim is complete BS; a

The later manual does exist, here are a couple of the changes including the A2 board without R7 and A1 board with Si regulator. David

The 140As usually have the first filter, but the military C52 spec 140B here has the second type of filter shown below. The top/bottom covers are solid, side covers are perforated, fan has to cool the

I've seen that second type referred to as "sleeve bearings". I think it was in an older edition of "Upgrading and Repairing PCs" that they talked about this, and they also pointed out that alleged

Humor? -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A.

After washing and rinsing the filter with soap and hot water, several people have told me they coat it with PAM non-stick cooking spray. ?? Bruce Gentry, KA2IVY

It used to be that for the older tek equipment (500 series scopes), you washed the filter then sprayed it with something that acted like a dust magnet. Harvey

Is there supposed to be a dust filter in addition to the metal screen "filter"? The screen is good for keeping fingers and larger animals out but for dust, not so much. The manual states to wash and

Pulling air out of an instrument means sucking air and dirt into the instrument, all around the edges. Not a good thing. Jeremy

It is easy to think that since HP equipment is designed for worst case environments such as overcrowded racks, high ambient temperatures and infrequent filter cleaning that it would be no problem to

Thanks, Chuck. The manual gives a procedure for lubricating the motor but, so far, I cannot find the places where it states to apply the oil. Apparently there should be holes to do that but I don't

Thank you so much for this. Lots of very good information. Interesting that you mention airflow direction. That's one thing that has puzzled me about this scope. There has been a lot of discussion

Good idea - I should have thought of that.

Hi. There are now three bearing types available:- Ball bearing. Sleeve bearing (often sintered bronze* sometimes a plastic material.) And Magnetic. (* With care, these can last a very long time.?

Hi, I also had a horrible noise from the fan in my hp5335A counter. What I did was to place 15 ohm, ? W resistors and 10 of them on a circuit board, in series with the fan, a total of 150 ohm. I

Greetings, Anyone having a clue to the last date of manufacture of the HP 3580A ? Thanks ! ----- Best regards, Goran Finnberg The Mastering Room AB Goteborg Sweden E-mail: mastering@... Learn

Hello Razvan, Thanks for reply. I will wait for your EEPROM files, if is possible.?I don't expect to get the initial accuracy, but could find a compromise. In meantime I identified the memory areas

Hi, I also had a horrible noise from the fan in my hp5335A counter. What I did was to place 15 ohm, ? W resistors and 10 of them on a circuit board, in series with the fan, a total of 150 ohm. I