CurtPalme.com Home Theater Forum

km987654 · Posted: Fri Jun 06, 2008 8:29 am Post subject: Tube Munching Machine

Is there any mod that can be done to stop Barco 1100 munching tubes???

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

No.
Well, if you succeed, you would be the first.

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

Are they notorious for eating tubes? Are any of the other Barco models the same way?

**AnalogRocks** · Posted: Fri Jun 06, 2008 5:21 pm Post subject: Re: Tube Munching Machine

km987654 · Posted: Fri Jun 06, 2008 10:33 pm Post subject:

Hopefully its not about having the best projector but about CRTs. Yes they are known for eating tubes but surely some tech head knows why!!

**AnalogRocks** · Posted: Fri Jun 06, 2008 11:43 pm Post subject:

OH I know why. Curt and I talked about this a couple of years back. On the 1100 series the HV comes on instantaniously instead of powering the projector and then a few seconds later turning on the high voltage. It's comparable to someone pulling you out of bed and slapping you into your work day in .5 of a second. Too much of a shock too many times 'till you crack.

If someone could engineer a HV delay circuit I'm betting, from my understanding, the tubes would last much longer.

km987654 · Posted: Sat Jun 07, 2008 12:02 am Post subject:

That makes plenty of sense. Has anyone tried or am I a pioneer. Also Analog Rocks how is your Ampro 4000g does it throw a good image? Does it chew tubes?

**AnalogRocks** · Posted: Sat Jun 07, 2008 12:07 am Post subject:

km987654 · Posted: Sat Jun 07, 2008 12:12 am Post subject:

So the 4000g have a weak PSU. Are they a good PJ to own?

jkruger · Joined: 24 Oct 2007 Posts: 2435 Location: Carlsbad, CA

What's the difference between that and leaving my 1209s in standby until firing it up? Doesn't it still get hit with HV from a cold start when I turn it on? Are the tubes hot in standby? It doesn't use much power in that mode.

km987654 · Posted: Sat Jun 07, 2008 12:18 am Post subject:

I don't know if standby keeps the tubes heaters going or not. If yes then standby could be OK.

**Curt Palme** · Posted: Sat Jun 07, 2008 1:32 am Post subject:

Keith, what analog said about the HV is true. Without massive reworking, you're more or less stuck with the chance of imploding tubes. Nothing you can do about it. Have you gotten a hold of the guy parting out the Ampros here? He's got 5 of them in Australia that should have good tubes. That can keep you in tubes for a long time.. Smile

That set is either on or off, standby does not keep the heaters going, so that won't change anything.

**AnalogRocks** · Posted: Sat Jun 07, 2008 1:43 am Post subject:

stefuel · Posted: Sat Jun 07, 2008 7:54 am Post subject:

"Tube munching machine"
That's what I used to call my wife BEFORE we got married. After we got married, the problem seemed to rectify it's self Rolling Eyes

r.bauer · Joined: 08 Apr 2006 Posts: 280 Location: The Netherlands

I don't know if the sudden rise in EHT when starting the projector is the cause of the SD146A dying prematurely.
The later model EHT board has indeed a slower rise of the EHT on startup. It starts very gently, you can actually hear the difference. http://www.curtpalme.com/docs/BarcoServiceBulletin_R762716_New_EHT.pdf

You can probably mod the earlier model EHT for a slower rise in EHT.

Joust · Posted: Sat Jun 07, 2008 1:24 pm Post subject:

nettwerkjohn · Posted: Mon Jun 09, 2008 5:16 am Post subject:

why not just leave it on, projecting a blank image?

**AnalogRocks** · Posted: Mon Jun 09, 2008 5:32 am Post subject:

That would be trading Cathode use for a lesser chance of tube failure. It's a bit of a compromise. Is the 1100 a noisey projector?

Mark_A_W · Posted: Mon Jun 09, 2008 5:56 am Post subject:

**AnalogRocks** · Posted: Mon Jun 09, 2008 5:57 am Post subject:

I knew that was comming ^