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That’s the same thing I was doing, not specific to anyone’s board (I’ve had issues like this with boards I’ve designed as well, I just revise them to correct before I release them). I don’t have any specific knowledge of issues with “Dez’s boards” (other than this thread) but I do have specific...

Isn't that what this thread is about?

There's some high frequency noise in the X amplifier. Could be caused by coupling from the HV oscillator or some other noise source OR one of the transistors in the amplifier oscillating. That issue in the bottom left if definitely oscillation. Likely the root cause is poor layout of the PCB...

No, the vertical will be incorrect as well. Most scan converters will do frame rate conversion as well, for example 62Hz ---> 59.95Hz. To accomplish this a frame buffer is used to store the input frame then read it out at the output frame rate either adding or dropping a frame when the in to out...

Maybe leaky HV? (could be on one of the grids as well). Try measuring the current drawn by the HV supply for both tubes, see if one is significantly higher than the other. Measure the INPUT current to the HV supply. (the low voltage side).

What meter are you using to measure those voltages? They are very low current supplies and if you are using a cheap meter with a lower input impedance it's possible you are loading down the supplies with the meter.

Which monitor style is it? Does it have the high voltage on the main board or does it use the separate "high voltage box" attached to the monitor frame? If it's the separate Keltron box I know someone that may be willing to sell you an NOS replacement.

I think @HudsonArcade was pointing out that there’s no specific resolution for the lines that are drawn, only the END POINTS fall on a defined grid for Atari games that use a 6100. The “pixels” in between have “infinite“ resolution and are mainly governed by a combination of the spot size/focus...

I think your numbers are off. The 13V and 92V are correct but those would be the PEAK voltages not PEAK to PEAK which would be double that ~26V and ~184V. If you multiply the peak voltages by .707 to get the RMS value you will end up with ~9.2V and ~65V. That being said I second your question...

The high score table is an addition on the kit it can be disabled via dip switch if you prefer it to look exactly like the original. The vertical is flipped, this monitor was likely from a mirrored cabinet. You need to swap the wires on the yoke/vert transformer to correct that. I also think you...

Made my day! I had to deal with someone with a Napoleon complex today.

Not a huge fan of those exposed connector pins with AC line voltage on them, to easy to touch with fingers or metal tools. Do yourself a favor and put some heat shrink on them. Other than that nice work!

Yea, the horizontal and vertical deflection rates are similar on vectors unlike rasters where the horizontal is sweeping 262 or so times faster than the vertical.

If you are going to be working on a lot of vectors OR want to troubleshoot down to component level I would recommend it but it does require some circuit knowledge to get the most out of. If you are going to rely on your DMM to make these AC measurements at least verify it works OK for this. Set...

lol, saved for posterity. I would look at the X and Y out on a scope, then you can track the signals through the amplifier stages in the monitor to see where they go wrong. Make sure the yoke connector and the yoke have continuity. I had one recently where the solder was cracked at the yoke...

Digikey has them in stock and I believe ships internationally. https://www.digikey.com/en/products/detail/central-semiconductor-corp/2N3792-PBFREE/4807606 https://www.digikey.com/en/products/detail/central-semiconductor-corp/2N3716-PBFREE/4807603 You can check Mouser as well, they may have...

I'm with ya man...damn critics are getting "excessively" annoying. As an FYI the capacitance values on the Cinevectron are higher to support the on board audio amplifier for Cinematronics CABs which is on the AR in Atari CABs. I haven't had a single report of a fuse blowing in a CAB with the kit...

Truer words have never been spoken!!!! Is this yours or Bob's? It sounds very much like him, but either way I'm stealing it! I also use simulation as well but I never try to use it as a replacement for prototyping OR common sense. Use the prototype to fix the simulation not the other way around...

Yes, the simulation is quite flawed. The input waveform is obviously a step function not a full rectified signal like the actual circuit. It's also using an "ideal" source with no source impedance which would "limit" the inrush as well (transformers DON'T have ZERO impedance additionally the...

That was my thought as well. But I used the dreaded “prototype” word that seems to draw venom from some in the community. Maybe the increased draw rate led them to the lower dot pitch tube after initial runs?