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1971 GEC 2103: 2040 Series Chassis

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by PYE625 » Sat Apr 30, 2016 5:13 pm

I wonder if the previous arcing from the PL509 anode cap has zapped the transistors?

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by Doz » Sat Apr 30, 2016 5:15 pm

PYE625 wrote:I wonder if the previous arcing from the PL509 anode cap has zapped the transistors?

Entirely possible... although ONLY BF194's???

Perhaps they are just fragile. Two remain on the board working fine.

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by PYE625 » Sat Apr 30, 2016 5:21 pm

Who knows Doz, but nasty spikes were probably sent all over the place and some transistors may be damaged more than others, indeed their type may be more vulnerable than others.

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by crustytv » Sat Apr 30, 2016 5:31 pm

Last time I had this level of three-legged carnage was on a PYE 697. An EHT flash-over took out everything on the decoder and the field output pair. Maybe something similar occurred in its past.

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by Doz » Sat Apr 30, 2016 5:49 pm

CrustyTV wrote:Last time I had this level of three-legged carnage was on a PYE 697. An EHT flash-over took out everything on the decoder and the field output pair. Maybe something similar occurred in its past.


If you look back on this thread, you can see the damage done when the PL519 anode lead failed. Like I say this is possible, but why all of one type?

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by Doz » Sat Apr 30, 2016 7:00 pm

Setting up the decoder I now have good locked colour. The convergence is awful, and most, if not all, of the pots are shot. I'll get some on order.

The slight hum bar that was evident was eliminated by replacing the LT smoothing can, C58 & C59 (1000 & 2000 uF) I haven't stuffed it as it's out of sight.

Left the set running and the brightness faded away before my eyes .... damn.

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by Doz » Sat Apr 30, 2016 8:30 pm

Brightness fading away was down to a 200u cap in the beam limiter. It's notable that on this set, the beam limiter isn't adjustable. Perhaps that was fitted to the bigger screen models only.

I managed to wrangle some convergence out of it. CRT is a treat :)

GEC1.jpg


Not quite sure what to do with the cabinet. It's a real mess and crumbling away.

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by colourmaster » Sat Apr 30, 2016 8:58 pm

Hi Andy
Well done , she's shaping up nicely.
My 22" version blew it's tripler taking with it an IF transistor and two on the decoder .
Best now to give it a long soak test .
Regards.
Gary.

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by Doz » Sun May 01, 2016 9:19 am

Ran beautifully all night.

 
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Re: 1971 GEC 2103: 2040 Series Chassis

Post by Doz » Sun May 01, 2016 12:28 pm

I think I'm going to have to have a go at making a new cabinet for this one. It's just crumbling away, and let's down an otherwise sound set. It may have to wait a while.

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