CurtPalme.com Home Theater Forum

**Curt Palme** · Posted: Tue Nov 04, 2008 9:03 pm Post subject: Running a CRT in 90% humity?

I get the coolest emails!

Has anyone had experience running a CRT in 90 degree humidity and 0 to 45 degrees C?

Not too worried about the temperature aspect, but the possiblity of arcing in 90% humidity has me a bit worried.

Any ideas?

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4409 Location: Phoenix

Hello

The humidity would have me concerned. We took an Advent 1000 into northern Michigan one summer for a meeting, 90 degrees and high humidity and no A/C, you could see the water in the air and the Advent made some funny noises when running.

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Electrogeek · Posted: Tue Nov 04, 2008 10:33 pm Post subject:

if this is something you are prepping for someone, the trick to make it happy in those conditions is to make sure the vanish on all the PCBs in in good nick (maybe consider giving them a second coat) and then on the anode wire make sure that the seals are air tight, (you can usually see if they are not) if not give it a good serving of silicon sealant (or you preferred non conductive sealant) and you should be good to go

**Curt Palme** · Posted: Wed Nov 05, 2008 12:00 am Post subject:

THanks! I am not sure of the application or where exactly it is, but I know it's 220, 50Hz.

**AnalogRocks** · Posted: Wed Nov 05, 2008 12:04 am Post subject:

I've run my Sony 1252 at 90%+ humidity. The HV got pissed off and arked. (pun) I opened the case, dried it out ( mainly the HV leads and splitter ) and all was fine again. That was the only time that projector ever failed. I've run it at 40deg C and 90-100% humidity here at my place for hours. It just keeps going.

Wasn't it you Tim that installed a PJ above a swimming pool at one point?

Electrogeek · Posted: Wed Nov 05, 2008 12:16 am Post subject:

Yeah, this is basically true for all CRTs, if it is very wet and the outside of the cathode leads are dirty the outsides of the cathode leads will conduct, if however, they are clean, and the high voltage transformer is well insulated (Silicon sealant or similar) it should be fine - also, it is only a problem if it condenses, therefore, warm crt + warm air + wet = fine, warm crt + Cold air + wet = Bad.

**AnalogRocks** · Posted: Wed Nov 05, 2008 12:24 am Post subject:

greg_mitch · Joined: 03 May 2006 Posts: 5320

km987654 · Posted: Wed Nov 05, 2008 8:58 am Post subject:

The crt would have to be colder than then surrounding air for condesation to take place. This is not likely as the tube temp will change with the air temp. Keep any contacts clean and free of dust you should have no problem. The real problem is low humidity under about 50% you risk static discharge and you can keep things as clean as you like but a static discharge can still take place. You should make certain that all earth contacts are clean.

repairguy · Joined: 30 Oct 2008 Posts: 10

Electrogeek · Posted: Thu Nov 06, 2008 1:53 am Post subject:

Aerosole Varnish Smile

Zebu Fellenz · Joined: 21 Dec 2006 Posts: 2567