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The Metcal has a cotton or felt cube that filters this also. I'd imagine after years of use it might be wise to either clean or replace the venturi (IIRC it can be popped out and a new one slotted

I said the CRT cable (thinking of where the cable leaves the HV unit) but Harvey said it straight forward: in the vicinity of the HV unit . This way you measure the HV transformer switching frequency

The Hakko desoldering station I have has two sets of inline filters.? One, a kind of springy thingy for stopping the solder bits and pieces from flowing into the pump, and the other a fiber disc for

The failures I saw with the Beckman pots were in telemetry receivers being built for NASA. They were the ones in use when we lost that last shuttle. The media was waiting for information, but when you

The silver was a very thin film that was applied to the substrate before the resistive element was printed on top of the substrate. The the terminals were crimped over the other end of the silver

Yup, you could be right, I just looked at a copy of the datasheet I found on the web. The strap line in the sheet is "Now you can specify Bourns for cost-sensitive applications" the sheet is marked

Hi Michael, You know, I've just been looking at that and you could be right, but I *really* can't tell how those connections were made! Comparing it with the apparently identical one on the old board

About 6-7 years ago, I used Bourns 3352 Cermet open-frame potis as a standard for replacements on amplifiers. I figured that open-frame would dissipate heat better. After about 2 years, I started

The compressor itself sits in an oil bath, under atmospheric pressure (the compressor shell is the inlet side), so no drain there. You do need to drain the receiver tank, as with any compressor. Ed is

I have never seen a bad Bourns trimpot that wasn't physically damaged, but I had Beckman removed from out approved vendor's list at Microdyne because they were damaged in the board cleaning process.

Thank god it was not the quality enclosed Bourns pots - I use them all the time! Replace the pot and hopefully you'll be back up and running! I don't trust open frame pots over 1M! Cheers! Pete

Insulin bottles are easy to remove the seals. The aluminum cap is crimped on, but it is so soft that a small screwdriver under the edge will pull it away from the glass, and then it will peel off the

The box would be steel, and just enough foam to reduce the noise. When I'm not using the bench, the power is shut off with the lights. Even the wall warts for chargers are powered down when I turn out

For a filter I used two small pill bottles one nested inside the other, hose from de-soldering head in large one with a? tube from the top to near the bottom, Cotton balls fill the smaller, which has

That could have fire safety problems. If it is too silent, and set to run via a vacuum switch, either continuous sucking, or a failed switch could let it run continuously and heat up inside the

The air conditioners are junk, but the mini fridge still works. If I was desperate, I could always use my vacuum pump made for A/C work. I would put the compressor in a foam lined box under the back

I've also had the email program fail at times, and REALLY hate to re-type long answers. easier to cut and paste. Harvey

Yes, This is the signature analysis mode. It causes the pr

Yes Michael, a window AC compressor would work too, but is kind of big for the application. I've found that mini-frig compressors are the handiest size for small dedicated P/V applications. BTW most

John wrote "Another thing to consider is the smoky output of desoldering. I recently repaired a Hakko 470, that has an on-demand vacuum pump, and found the smoke had gummed up the rubber flap reed