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MTC 9000 died in sleep

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big10p View Drop Down
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    Posted: 12 Aug 2017 at 8:37pm
I have a 9000 chassis I fixed up a good while ago, which I connected to a tube a few weeks back, and it was working great. Put it to one side while I fix up the cab it's going in, and now it doesn't want to play. Confused

No neck glow but B+ is a steady 143v. Is that a tad high? Some googling suggests fault could be in heater circuit on neck board. Any idea what components I should test? Any other ideas what the problem might be?

Cheers!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gunblade Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 2017 at 10:47pm
b+ should 130v
does it work if you turn h.hold fully one way or the other
dummy load the b+ and then the HOT

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Post Options Post Options   Thanks (0) Thanks(0)   Quote big10p Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2017 at 11:02am
I tried it with H Freq turned fully both ways, but still the same. Sorry, I don't know how to dummy load the B+. I'll pull the chassis out later today and see if I can spot anything suspect.

Cheers.


Edited by big10p - 13 Aug 2017 at 11:03am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote big10p Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2017 at 12:47pm
Well, think I've found the problem. Went to remove the neck board to take out the chassis, and this happened. Confused



No idea how this has happened, as I put it out of harms way and am pretty sure I haven't knocked the neck at any point. Bugger! This was a nice burn-free videocolor tube, too. Angry
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gunblade Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2017 at 12:48pm
bummer
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ace` Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2017 at 12:51pm
Time to find yourself a 19/20" tv on freecycle and do a tube swap.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote big10p Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2017 at 1:38pm
Luckily, I've got a spare tube - just has a couple of small scratches in it that I can probably live with. Just fired it up and all seems fine, so at least I know the chassis is good, still.
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