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From: mikel@ccvaxa.UUCP
Newsgroups: net.micro.amiga
Subject: High res tubes and SMOKE
Message-ID: <26600027@ccvaxa>
Date: Tue, 18-Mar-86 09:10:00 EST
Article-I.D.: ccvaxa.26600027
Posted: Tue Mar 18 09:10:00 1986
Date-Received: Fri, 21-Mar-86 03:27:19 EST
Lines: 39
Nf-ID: #N:ccvaxa:26600027:000:1842
Nf-From: ccvaxa.UUCP!mikel    Mar 18 08:10:00 1986



And they say where there is smoke there is fire.  Well I had some smoke coming
out of my Amiga, but no fire.

I have some graphic tubes here at work and I was going to hook them up to my 
Amiga using the RGB outputs (I already have a VT240 head hooked up and
working with no problems.)  I hooked up the RGB connectors and then the 
composite sync.  I was trying not to have to use the h+v sync separately, but
I later determined that it was needed. (FYI the connections were properly made)

Having no luck with this tube because it required separate h+v sync I decided to
try another tube (Silicon Graphics), as soon as I had turned on my machine, I
smelled smoke! I turned off the machine, took off the cover (my machine is 
out of warranty by a few months) and inspected it.  After looking at all the
components and seeing nothing burnt, I decided to plug it back in and watch for
the fire.  Well, nothing smoked again, but what did happen is that the picture 
on the VT240 is not as sharp as it was  before.  I suspect I fried some of the
filtering for the video.

One of my questions is has anyone else tried to hook up there Amiga to other
graphics tubes and had any problems?  I know lots of people have hooked up to
the Sony monitor and a few others, but I was wondering about tubes used for 
high res graphics ( >= 1K x 1K).  Do these types of tube draw too much juice
for the outputs from the Amiga?  Does anyone have the specs for RGB signals
and output levels?

Another question is does anyone know which chips, caps, resistors, and inductors
make up the filtering for the video?  I don't want to have to reverse engineer
the board.  I will be using the scope and looking at the signals in the mean
time.

Thanks for any info,

Mikel Matthews

Gould Computer Systems Division, Urbana, IL
inhp4!uiucdcs!ccvaxa!mikel
mikel@gswd-vms