Where to get a replacement CRT

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Joined: Mar 6 2006
Posts: 15

Hi

I'm looking for a replacement CRT for my colour classic. I recently won an auction for one on ebay but the seller (ebay user ID: jms.esp) did not honour the deal, possibly because the auction closed at £2.50 Very annoying...but what can you do.

Anyone have any ideas?
Maybe someone out there has a spare hanging around?
Thanks for any suggestions.

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Offline
Joined: Dec 20 2003
Posts: 180
Me also!

Only alternative is to get a dead CC and hope the CRT is OK.

I 'won' a CC a/b from the same seller. Same total lack of response. Let's both post -ve feedback, to protect others from him.

Stuart

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Stuart Bell,
Developer of the PowerCC site a long time ago.

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Joined: Mar 6 2006
Posts: 15
Ebay timewaster - jms.esp

Don't worry, I already posted the appropriate feedback: "Will not respond to any of my emails. Did not honour deal. Not to be trusted."
This guy had no problem replying to my questions proir to the auction ending - he even mentioned you by name Stuart and suggested that I look at this forum (which I was aware of anyway).

jms.esp

Someone to avoid ebay-wise!!

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Joined: Mar 6 2006
Posts: 15
Maybe not a CRT fault?

Maybe the problem with this CC is not the CRT but the video card?
Having had another look it's nowhere near as bad as I remember it being - but there is a sort of shadowy line running just to the right of centre: http://web.ukonline.co.uk/gdmorris/Classic_Screen.jpg

Could this be something to do with loose cables or poor solder joints somewhere? Maybe it needs deguassing? or is this sort of thing normal for colour crts?
I initially was thinking burnt out phosphors - hence bad CRT, but now I'm not so sure.

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Joined: Dec 20 2003
Posts: 180
Most likely

problem is indeed an a/b issue. In my experience, apart from screen burn, CC CRTs either work or they don't. Where are you geographically? I have a spare CC CRT in the garage, but I hate the idea of entrusting it to the PO!

Stuart

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Stuart Bell,
Developer of the PowerCC site a long time ago.

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Posts: 15
I'm in London, cityside E1.

I'm in London, cityside E1. So you think from looking at the image that this shadow could be caused by the anologue board? The image is stable and sharp. The shadow is only really visible when the desktop background is grey or white - but, being the doomed perfectionist that I am, it really bugs me.

....so I should be looking for a replacement a/b instead?

Offline
Joined: Dec 20 2003
Posts: 180
Difficult to be certain

One sure way would be to open up the CC, and release the yoke clamp. Rotate the yoke a little. If the fault moves, then it's probably the a/b. If the fault stays fixed, then it's probably the CRT.

a/bs are VERY hard to find.

But next time I'm going to be in EC1, I'll try to remember to let you know. If you ever head towards Southampton, you can have a CRT FOC, if it turns out that that's your problem.

Stuart

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Stuart Bell,
Developer of the PowerCC site a long time ago.

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Posts: 15
Good idea

That's a good idea, I'll give it a try this weekend. Thanks for the kind offer of the CRT, which I will definitely accept, should it prove to be the problem....but knowing my luck it will be the a/b (!)
Maybe if it is the a/b a spot of joint resoldering might help? I once managed to resurrect a Mac Plus this way, maybe worth a try.

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Joined: Dec 20 2003
Posts: 180
Re: Good idea

djpumpkin wrote:

That's a good idea, I'll give it a try this weekend. Thanks for the kind offer of the CRT, which I will definitely accept, should it prove to be the problem....but knowing my luck it will be the a/b (!)
Maybe if it is the a/b a spot of joint resoldering might help? I once managed to resurrect a Mac Plus this way, maybe worth a try.

Absolutely. Start with cold joints, then leaking capacitors.

Stuart

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Stuart Bell,
Developer of the PowerCC site a long time ago.

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Posts: 15
CRT seems ok

Well, having rotated the yoke and seen the screen 'shadow' move accordingly - I have to conclude that the CRT is not to balme. I would never have thought the a/b was to blame as the image has always been very stable and noise free...but then this is a colour screen, which I suppose is more sensitive to component ageing/failure. Before I attempt to resolder the a/b board I think i'll have a go at the small video board sticking out behind the neck of the CRT. If anyone knows of any particularly sensitive video related components on the a/b i'd be very grateful for any info.

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Joined: Dec 20 2003
Posts: 180
Careful!

Given that CC a/b boards are highly endangered species, and that a working a/b that gives a shadow on the CRT is better than an a/b that gives nothing, do be careful! Wink

Good luck,

Stuart

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Stuart Bell,
Developer of the PowerCC site a long time ago.

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Posts: 15
Point Taken

Yes, I will be VERY careful.
From what I can see of the board itself , it looks pretty grimy. One visible resistor seems to have leaked some orangy coloured liquid. I've done some searching around various forums, but there doesn't seem to be an obvious answer to what is causing the (arcing to the right) shadow.

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Joined: Dec 20 2003
Posts: 178
Re: Video board

djpumpkin wrote:

... Before I attempt to resolder the a/b board I think i'll have a go at the small video board sticking out behind the neck of the CRT. If anyone knows of any particularly sensitive video related components on the a/b i'd be very grateful for any info.

Keeping Stuart's caveat about taking care against breakage well in mind, pay close attention to the soldering of the pins connecting the video board and CRT. Use fresh solder rather than a remelt if the soldering is suspect. Tarnish, from slight to pronounced, needs cleaning off (both pins and receptacle). Look also for molten plastic from overheated pins, caused by arcing within the connector. From there, look for molten cable jackets (same cause). Cast a jaundiced eye also over the connection of the loom to the a/b, breaking and remaking it two or three times.

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