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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

I've seen an inline filter with a cotton ball in a glass sleeve so you could see when it needed changed. I've save a bunch of my empty insulin bottles, to see if I can cut the bottom off to use like

Rick, if I have a long message to post, I type it into something like Open Office Writer, or whatever word processing software you prefer. Once I'm happy with it, and have checked it for spelling

How about using a compressor from an old window air conditioner? I have several that still run but ice up. Michael A. Terrell

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 valves of the

Harvey, After spending some additional time with the service manual. I see there is a way to cause the microcomputer to cycle through the full range of memory addresses on a repetitive basis. This is

Rather than having to provide compressed air for a venturi, it's quite easy (and much quieter and efficient) to use an old refrigeration compressor to provide vacuum - they are very good at it. Using

Did that pot have a short trace of silver between the end of the resistor to the terminals? It can oxidize, and open. I've seen a lot of that type that failed, but they were mostly other brands. I