UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

samjmann · 27th Feb 2021, 10:24 am

Bit late to the party...

I had a GR2.4 that did similar. The picture would dim in steps, and then clear. This set was ex- rental but only 18months old at the time.
The fault was the CRT... I simply lived with it. The set with its gull wing tube gave a great picture. The rest of the family barely noticed it, just me.

If you've got access to a scope, monitor the RGB cathode waveforms, this should show if its the drive that's varying. You can use just a meter, but judgement is more difficult.

In some cases a very gentle tap the the CRT neck can bring the fault on. SJM.

27th Feb 2021, 10:24 am	#10
samjmann Heptode Join Date: Feb 2014 Location: Nottingham, UK. Posts: 649	Re: Philips GR2.2 Contrast Dims/Sound Cracks Bit late to the party... I had a GR2.4 that did similar. The picture would dim in steps, and then clear. This set was ex- rental but only 18months old at the time. The fault was the CRT... I simply lived with it. The set with its gull wing tube gave a great picture. The rest of the family barely noticed it, just me. If you've got access to a scope, monitor the RGB cathode waveforms, this should show if its the drive that's varying. You can use just a meter, but judgement is more difficult. In some cases a very gentle tap the the CRT neck can bring the fault on. SJM. __________________ It's never been right since we've had it...