MS9-29 Solid-State "High Life" capacitor replacement

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    • MS9-29 Solid-State "High Life" capacitor replacement

      I've created a Digikey BOM for a special MS9 cap kit. Wherever possible, solid-state capacitors (Aluminum Poly, Ceramic, etc) are used in place of electrolytic caps. This covers all of the signal section, with the intent of guaranteeing more linear response curves for the RGB inputs, and long-lasting stable geometry that isn't as temperature sensitive. Because of limitations of capacitor technology, much of the primary power supply section remains in the form of electrolytic caps. All are rated for 105 degree temperature, and are based on the BOM of my normal MS9 electrolytic cap kit.

      Here's a Digikey cart:

      BOM attached in a ZIP file.

      The downside is that it's quite expensive (about $55 USD) but I hope the (ostensible) long term stability offsets the cost in the long run.

      I replaced the caps in my MS9 this way the other night, and ran it for about 4-5 hours. I could detect no adverse effects on my monitor's image.

      Capacitors have reference designators defined, so each cap should arrive in a nice clear baggie with the capacitor location written on it.

      Please excuse my poor tube geometry and convergence; adjusting the yoke and doing convergence strips is a royal pain in the Egret II since the monitor is frameless.


      The post was edited 3 times, last by Hatsune Mike ().

    • I just want to say that I strongly support this. A lot of capacitor replacement websites and kits use cheapo stuff.

      Electrolytics are known for their poor characteristics and short life. The only reason we see them everywhere is because they're cheap to make and usually "good enough."

      Just this week I repaired a less than 2 year old HD monitor because of crappy electrolytic capacitors.

      Aluminum polymer is the way to go for stuff like this. It's a newer technology and vastly improved. Of course, the drawback is cost. But when were talking about irreplaceable vintage Japanese monitors (that are gorgeous, I might add) I think it's well worth it :)

      Thanks for sharing!