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Main => Monitor/Video Forum => Topic started by: Popcorrin on July 17, 2008, 09:45:47 pm

Title: How warm is too warm for the horizontal output transistor?
Post by: Popcorrin on July 17, 2008, 09:45:47 pm

I broke the neck on my monitor tube so I replaced it with a spare tube that I had. 

Grantspain informed me that the tube I was replacing had a low inductance and that the tube I had replaced it with might be of higher inductance causing the chassis to run a little hard. 

With this in mind I checked the hot and noticed it was running pretty warm. 

 I guess I don't know how warm is too warm and I was wondering if there was a way to judge.

Title: Re: How warm is too warm for the horizontal output transistor?
Post by: grantspain on July 18, 2008, 12:57:01 pm

the horizontal transistor will run warm,if it runs too hot then it will burn out.
if it burns out in a month or two then you have a problem,see how it goes

Title: Re: How warm is too warm for the horizontal output transistor?
Post by: Popcorrin on July 19, 2008, 03:03:23 am

Okay thanks

Title: Re: How warm is too warm for the horizontal output transistor?
Post by: Ummon on July 19, 2008, 03:20:29 pm

grant, have you ever seen a component light up? I notice that a certain, I think, resistor on the chassis will get red hot, as well as some artefacting in a particular part of the screen (for example, the lower right quadrant in Ms Pac there will be a patch where the scanlines blur) if I run a certain scan rate. Just above it, or just below this scan rate and no apparent problem.

Title: Re: How warm is too warm for the horizontal output transistor?
Post by: grantspain on July 19, 2008, 03:40:04 pm

only time i have ever seen a component glow brightly is with the hantarex mtc9000 chassis,there was a heavy duty load resistor which would glow like an electric fire if the hot and power supply transistor went short
for a resistor to glow then it is being put under some serious load,for the chassis to still work is strange
what chassis is it?

Title: Re: How warm is too warm for the horizontal output transistor?
Post by: Ummon on July 21, 2008, 03:48:37 pm

Um, I don't know what chassis. It's the Billabs B0P monitor, the discontinued penta-mode. Yeah, it still works. I don't run that mode, and only stumbled upon it through using advancemame. I guess there's a range there where the monitor will actually do the scanrate but not like, yet not outright blow or shut down.

Title: Re: How warm is too warm for the horizontal output transistor?
Post by: grantspain on July 21, 2008, 04:02:41 pm

i guess it could be just above the frequency range of the chassis,my bet this component is in the horizontal output stage