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I have successfully made a CT-6 replacement by taking apart an ethernet transformer (Bourns SM51108), cutting off the old windings and winding 10 turns of thin wire on the toroid. This transformer

I have not read all the other responses so apologies if this is a repeat. I owned a 744 once with the same hiccup behavior. The CRT driver circuit was bad. You report that you have (had) good VGA from

I was thinking the same thing, make a kit out of it?

BW upgrade works equally well, either via GPIB or Network. Raymond

Short question: Is the BW upgrade on a TDS3034 only possible with GPIB or is ethernet also possible?

That doesn't make sense? Show the display with the calibrator as input. Set trigger to Auto.

Yup, a balun (CM choke) could be in the rather long section of the mechanical mounting structure between the small core and the cable connection. It would help with CMRR.

Joe, the board seems very simple to build. If the processor was programmed is there any reason we can't assemble it? Pretty sure we have the skills and tools to succeed! And it seems it would take a

Followed the SM instructions for 'No Display' but haven't made any real progress, other than getting a dot to appear on the screen (as opposed to merely glowing off-screen) by adjusting the R587

So the flicker only shows up at slower sweep speeds it goes away as I slow the time base down.

Hi all, In addition to the obvious current transformer, there’s likely to be a balun, to make the probe less sensitive to electric (capacitive) coupling. Thats’ probably in the longer tail, away

Check the CPU's reset line. It's driven by an optocoupler on the power supply board, as I recall, and the resistor that drives the LED side of the optocoupler can open up. -- john KE5FX

Hello everyone, First of all, I apologize for being absent from the forum for so long. Some time ago, I ordered the capacitors and have already replaced them. However, I made a mistake: instead of

If you go to our website and search for demo board, you find the description. eBay listings disappear when sold out. https://vintagetek.org/vintagetek-demo-board/ Dave

Here is the link to the board description. It contains a link to a zip file that has some instructions, a Digikey BOM, schematic, and hex file. I assume the hex file is to load the ATMEGA328P.

Given the fact that these 25 boards were sold out rapidly I'd assume there is demand for the next 250 boards rather than the next 25! I hope I will be quick enough next time! Thanks to you volunteers

?ann sun., 2. mar. 2025 kl. 15:49 skrifa?i Larry McDavid via groups.io <lmcdavid@...>: Follow the white rabbit (from the first post): https://www.ebay.com/itm/116498624308 >

Please point to where this demo board is described. What does it do? I could not find it on the Tek museum website.When you say? "Watch the store," what store? Do you mean the Tek Museum eBay store?

We have inventory for another set of 25 and will begin building. Watch the store. We didn't expect this amount of demand and have a lot of shipping to tend to this week.

That should work. You can experiment with different cores easily and see how they measure up. Ed