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EKCO T283 Ressurection

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unixmanuk
(@unixmanuk)
Posts: 28
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Hi Folks,

I thought I'd share the fruits of my labours with this set so far with my fellow VRATS.

This has been the subject of a thread on UKVRR for a while now. It needed a replacement tube, so as a result progress was slow until one turned up. Still better late than never!

So far, I have replaced the CRM141 with a CRM142, U25 EHT rectifier, Boost cap and a couple of caps and resistors in the frame stage. As you can see, the linearity is not correct yet, so I'm working on that. The Visconol EHT reservoir and Metrosil are out of circuit (no noticeable difference

All other paper caps will follow in due course. I apologise for the picture quality - the Moire patterns aren't on the screen, but are caused by shrinkpic resizing my iPad photos :grin:

The chassis was in the cabinet as a temporary measure, so the knob escutcheon is missing on the on/off switch.

Final pic shows the unit I use to provide my System A source. The unit sat on top of the scope is a VGA combiner and VHF modulator (on channel B4), fed by a linux box running MythTV. Testcard is on a CD

I'll hopefully post some (clearer) photos as I progress.

John

 
Posted : 24/12/2012 1:17 pm
Anonymous
(@anonymous)
Posts: 16868
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Myth TV is just the media player. The "standards" conversion is due to programming the Graphics card to "405" rather than VGA/SVGA/XGA etc.

It doesn't work with all graphics cards.

You could use ANY linux graphics program to display testcards once the graphics card is reprogrammed, MythTV only needed to manage Video input/ TV tuners etc.

For just test cards and slide show an old 486 with old version of Linux will do.

 
Posted : 24/12/2012 5:23 pm
unixmanuk
(@unixmanuk)
Posts: 28
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Thanks for the pointers, Trevor. I will be looking at that circuit in earnest shortly.

The tube is remarkably good - the tester puts it in the bottom of the "good" portion on the emission scale. The original tube was dead beyond belief.

As for FOTH, well, it gave me something to stretch my ingenuity. Is is overkill really, and it'll obviously never come close to an Aurora in terms of useability but until I can get one, it will have to do for now.

I noticed the title spelling gaff after I posted, but was too late - "resurrection" was what I really meant... :oops:

John

 
Posted : 24/12/2012 5:31 pm
unixmanuk
(@unixmanuk)
Posts: 28
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Topic starter
 

I don't always use MythTv as you say Michael. The Ubuntu media player runs my CD better anyway.

It is useful if you want to use a tuner though.

John

 
Posted : 24/12/2012 5:34 pm
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