Korting 82512 TV pattern generator - UK Vintage Radio Repair and Restoration Discussion Forum

andrewn · 27th Jul 2017, 9:45 pm

I need to service this pattern generator as the performance is poor. The horizontal lines don't work anymore and the colour bar mode has flickering at the bottom of the screen. I bought it at a radio rally many years ago and I've only used it a few times. There's a couple of things that concern me, there is what I guess is a thermistor left loose inside where it could touch any component. I presume its supposed to fit on the transistor I've photographed? It must have been removed on purpose as I can't refit it without removing the metal ring.
The mains input connector has been removed with the mains lead hard wired. A three core mains lead is fitted but the earth has been cut off! Should I connect an earth?

Thanks, Andrew.

karesz* · 28th Jul 2017, 11:59 am

Hello Andrew,

Here is a German doc over Korting 82510_I think it helps too...

Regards, Karl

andrewn · 28th Jul 2017, 9:20 pm

Thanks Karl, that looks almost the same so there can't be many differences between the two models. I'll study it and see how I get on.

TonyDuell · 29th Jul 2017, 5:10 am

Without seeing the manual or the instrument, my first guess is thast the German manual is for the version used in Germany with 5.5MHz sound offset whereas the UK version will have 6MHz offset. So there will be changes in the RF modulator section but the rest of the thing might be much the same.

MotorBikeLes · 29th Jul 2017, 9:08 pm

Was not this imported over here as the Decca CBG?
Les.

27th Jul 2017, 9:45 pm	#1
andrewn Pentode Join Date: Aug 2008 Location: Taunton, Somerset, UK. Posts: 135	Korting 82512 TV pattern generator I need to service this pattern generator as the performance is poor. The horizontal lines don't work anymore and the colour bar mode has flickering at the bottom of the screen. I bought it at a radio rally many years ago and I've only used it a few times. There's a couple of things that concern me, there is what I guess is a thermistor left loose inside where it could touch any component. I presume its supposed to fit on the transistor I've photographed? It must have been removed on purpose as I can't refit it without removing the metal ring. The mains input connector has been removed with the mains lead hard wired. A three core mains lead is fitted but the earth has been cut off! Should I connect an earth? Thanks, Andrew. Attached Thumbnails

28th Jul 2017, 11:59 am	#2
karesz* Heptode Join Date: Jun 2010 Location: Zurich, Switzerland Posts: 538	Re: Korting 82512 TV pattern generator Hello Andrew, Here is a German doc over Korting 82510_I think it helps too... Regards, Karl

28th Jul 2017, 9:20 pm	#3
andrewn Pentode Join Date: Aug 2008 Location: Taunton, Somerset, UK. Posts: 135	Re: Korting 82512 TV pattern generator Thanks Karl, that looks almost the same so there can't be many differences between the two models. I'll study it and see how I get on.

29th Jul 2017, 5:10 am	#4
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,215	Re: Korting 82512 TV pattern generator Without seeing the manual or the instrument, my first guess is thast the German manual is for the version used in Germany with 5.5MHz sound offset whereas the UK version will have 6MHz offset. So there will be changes in the RF modulator section but the rest of the thing might be much the same.

29th Jul 2017, 9:08 pm	#5
MotorBikeLes Nonode Join Date: Dec 2012 Location: Kirk Michael, Isle of Man Posts: 2,350	Re: Korting 82512 TV pattern generator Was not this imported over here as the Decca CBG? Les.