Jack, in response to your email of 1:33 pm: I think it's possible that your "excessive trace brightness" problem could be an issue with HV circuit component failure (as others have suggested), and/or

I am cheap, so I took a chance on a CCC (Cheap Chinese Crap) ZD-985 Vacuum desolder station @ about $119.00 (about 2 years ago) delivered in 2 days. Amazon has a great return policy, so when I got

Arduinos can dump serial stream data direct in to a pc the micro can handle all the pc interconnect as well.

Hello Mr Walter, can you be more specific with the bad rectifiers please. If I understand correctly you mean that in some cases someone can find a partially bad rectifier? Panos.

Getting the data digitized is the easy part. Can someone write the software interface between the USB and the computer screen? Arduinos and PICs probably have USB driver functions, its the graphics

Bert, my drum beats hail and hearty for anyone who can do a job with el-cheapo tools and the results are no different than using the super expensive "I wanna have one too" tools. I jest a bit but

I have an old 575 like the one your brother has. I think I might do a little exploration into the circuitry to see how one might drive a pair of A/D converters to get the horiz & vert data.

The 2mV vertical range on the 2235 is a triumph of marketing over technology, as it really pushes the performance of the scope to a place where it doesn't willingly want to go. virtually all 2235's

Hi Jack, Now that you confirm that you made a sign mistake (question in my previous response) the fault is certainly not in the Z-axis board, diagram <16>, or in the CRT itself. In y opinion it must

If you have the information, you can find a way of using an external programmer to put the info into the new ic. The GPIB is not necessary. You have to proactively capture the contents before any

Matt, Correct, No USB or other ports on the 576. It is from an age before USB was even a dream. There is a person who has accomplished this, yes. Where and How they tap in to get the data??? That

Hi Dave, Not sure if your question is directed my way. The FR300 has 3 controls, 1) an on/off switch to heat up or turn off the gun, 2) a temperature dial, and 3) a trigger to engage the vacuum

I have no knowledge of the 576 circuits but it is conceivable if the voltages are within limits an analog transmission gate could replace an electro-mechanical relay. Of course the "on" resistance

I assume that the 576 Curve Tracer doesn't have a USB interface and this guy has somehow added one? Any idea how/where he tapped off of the 576 to digitize the data on the CRT?

I'm sure it could be done, however, you'd need to use some sort of isolator-gate-driver for each set of contacts you want to replace. Such devices do exist.

Update, everyone I am a complete idiot. I had my leads wrong, the grid is actually around 150 volts ABOVE the cathode, which explains everything. Thank God it isn't a broken grid, but... the Z axis

Tnx Jean-Paul! Your bench seems to be well equipped, too! I love these plug-in oscilloscopes, which I dreamt to play with when I was attending high-school! Having space enough, nowadays they are a

The problem I see with a micro-ohmmeter, and indeed, any low resistance measurement, is that it needs to be done in Kelvin mode.  If you can do that, then that's ok. I prefer a constant current

How do you operate it? I see a button - does pressing it energize a pump? Does it come with instructions? Thanks, Dave ________________________________________ Sent: Tuesday, January 07, 2020 11:45

Through strong recommendations from others in the group I bought a desoldering gun about 8 months ago. My Hakko FR-300 eBay purchase came with various sized nozzles. It works great and has saved me