CurtPalme.com Home Theater Forum

HogPilot · Last edited by HogPilot on Tue Aug 03, 2010 2:10 am; edited 2 times in total

Guys,

Someone posted this about CRTs over in the "other" forum. He has an alarming propensity to make crap up when it suits him, and since I know nothing about CRTs, I figure someone here would have to know if this were true, quasi-true, or total B.S.:

Quote:
When watching video in even semi-darkened room, some means of suppressing the flicker must be used. For decades the main technique used to make CRT TV displays viewable without flicker was to power the CRT B+ plate voltage from a high voltage power supply which imposed a 120Hz "ripple" that basicly caused a 120Hz brightness change in sync with the 60Hz room lighting.

As I understand it, flicker isn't even an issue unless you have some sort of pulse-driven display (like CRT or plasma) in a room with lighting that's also pulse-driven (like fluorescent lights), and the lights are operating on a different refresh frequency than the display. But either way, is the above description anywhere near correct? If anything is incorrect, would you mind correcting me or him and helping to get the facts straight?

Tom.W · Joined: 09 Mar 2006 Posts: 6368

Are you asking about vertical refresh rates ?

http://en.wikipedia.org/wiki/Refresh_rate

**AnalogRocks** · Posted: Mon Aug 02, 2010 4:29 pm Post subject:

I don't remember hearing anything about this for North American CRT RPTV's but Europe had some that were 100Hz. As far as I can tell that was only when you ran a 576i signal into them

Phil Smith · Joined: 08 Mar 2006 Posts: 4096 Location: Irving, TX

Is this off topic? Wink

**AnalogRocks** · Posted: Mon Aug 02, 2010 4:39 pm Post subject:

No actually it should be in the Direct view section Laughing

HogPilot · Posted: Tue Aug 03, 2010 2:08 am Post subject:

Ha, dammit, I should probably re-post this over there. Thanks for the point in the right direction Smile

**AnalogRocks** · Posted: Tue Aug 03, 2010 2:17 am Post subject:

Why didn't you just ask me to move it?

EDIT: Done!

HogPilot · Posted: Tue Aug 03, 2010 2:37 am Post subject: