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  Tele-tales. Part 1
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 Return to top of page · Post #: 16 · Written at 7:08:34 PM on 9 February 2022.
Brad's avatar
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 6851

Photos uploaded to Post 14.


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A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 17 · Written at 5:04:51 PM on 20 February 2022.
Labrat's avatar
 Location: Penrith, NSW
 Member since 7 April 2012
 Member #: 1128
 Postcount: 321


Tele-tales. Part 4. 20-2-2022


Well friends, the set is almost done, and the end is in site.
Before I tell you what is left to do, I shall tell you about what I have encountered.

First I had to give the picture tube another “kick in the groin” with the tube tester. I just could not get the picture to track well enough from low to high brightness levels.

The tube read better but the red gun was prone to comet tailing, and green gun had too much inter-electrode capacitance. When the brightness was advanced, the green background would disappear as the whole screen would become green. Also when at a moderate brightness the green's beam would be de-focused.

After a couple of days, the tube behaved much better. Perhaps some particles tell off the electrodes of the guns. Much better now, and set up a treat.

There is some blooming, but not enough to warrant fitting a new trippler.

There was still quite a bit of random issues that were sorted out by
re-soldering ALL the pots, not forgetting the wiper arm to solder tag rotating connection on each. the connectors of each module were re-soldered and C.R.C. applied.

Alignment of the 4.43 MHz oscillator was was way off. I can't imagine how the burst signal was able to lock it.

Now back to the present. Still to go.
The set needs a TBA 240B ic. and the power switch is still playing up. Then a good long soak test. The set no longer shuts down whenever stared at, nor when tapped with the end of a calibrated screw driver. It looks remarkable for its forty-seven years. A pleasure to view.

Anyone able to help with a TBA 240B ?



Wayne.


 
 Return to top of page · Post #: 18 · Written at 10:08:52 AM on 21 February 2022.
Morren's Gravatar
 Location: Killarney Vale, NSW
 Member since 19 March 2012
 Member #: 1112
 Postcount: 24

Hi Wayne, I’ve put the call out for a TBA 240b on the Facebook forums as well. I’ll let you know if I have any luck!


 
 Return to top of page · Post #: 19 · Written at 7:48:25 PM on 14 July 2022.
AndyLauncestonTV's Gravatar
 Location: Launceston, TAS
 Member since 31 March 2022
 Member #: 2496
 Postcount: 12

Great post.

Really good trouble shooting skills.

After seeing the photos, I'm starting to feel things about K-(5)9 I haven't felt for years!


 
 Return to top of page · Post #: 20 · Written at 7:54:42 PM on 14 July 2022.
AndyLauncestonTV's Gravatar
 Location: Launceston, TAS
 Member since 31 March 2022
 Member #: 2496
 Postcount: 12

G'day Labrat.

Those K59 (insert-revision-number-here) sets really do it for me. The cabinets were so (for the time) "stylish" The floor models were bigger than my mum and dads couch. In the early 90's they were fish tank conversion fodder which was a great shame. Apparently the 59-3 was available with a "Pong" (the old TV game) module! I'm not sure what device they sold to manipulate the "bat' though.

They were the first TV I can remember with "touch control" which, from memory, was a pain in the a.s% when the paint wore off the buttons and it didn't want to play anymore.

The tripler blocks (no idea of coorect speeling) were prone to failure as were the EHT caps. Hissing and arching all over the place. The SMPS loved to go tick, tick, tick too when there was a dodgy feedback or an "overload" somewhere.

You're lucky to have such a "sexy" set. Can you post cabinet photo's?

P.S I'm not a technician, just a hobbyist, and I love plugging them in and hitting the LOUD BUTTON..... run up slowly on the variac. Where did my carefree youth go?

Cheers, Andy


 
 Return to top of page · Post #: 21 · Written at 8:35:48 PM on 14 July 2022.
Johnny's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 513

I find running them up on a variac will still result in smoke and loud bangs, sometimes from the variac as well!
A much better and relaxing way is two 75 Watt incandescent globes in parallel, wired in series with the mains, then fire up.
If globes remain at full brightness switch off you have a major problem.
And thus avoid destroying new and expensive components. Heart failure and temporary blindness.
JJ


 
 Return to top of page · Post #: 22 · Written at 4:37:20 PM on 25 July 2022.
Irext's avatar
 Location: Werribee South, VIC
 Member since 30 September 2016
 Member #: 1981
 Postcount: 420

Following this really bring back some memories.
I've lost track of how many triplers replacements and power supply rebuilds I did back in the 70's on 59-1 Krieslers.
They produced the best pictures of all the crop back then and were nice to work on.
Lovely cabinets also.
Rejuvenating the CRT's was very hit and miss and didn't last very long unfortunately.
One thing to watch is the capacitor across the line o/p transistor.
If it has two in parallel be afraid.
If one goes o/c the EHT goes way up and punches a hole through the CRT bell.
The solution was to fit a single 11nf cap in place of the two.
It was a green one if my memory serves and if it went o/c the line o/p transistor failed immediately with no possibility of CRT damage.


 
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