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

FERNSEH · 5th Jun 2021, 1:03 pm

I doubt if Philips would have ever considered twin panel CRTs for their TV sets and only offered the A59-16W as another source of supply of that type of tube to UK manufactures. Kolster-Brandes was the biggest user of the twin panel tube.
The HMV 1920.
The light dependant cell has a 100Kohm shunted across it. Today, that resistor was replaced with one of a 18Kohms. Might even consider reducing the value to 10K. Picture contrast is improved by a considerable amount.
I'm assuming the LDR is a Mullard ORP60. No markings on it.

DFWB.

5th Jun 2021, 1:03 pm	#45
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: HMV 1920 made in 1960. I doubt if Philips would have ever considered twin panel CRTs for their TV sets and only offered the A59-16W as another source of supply of that type of tube to UK manufactures. Kolster-Brandes was the biggest user of the twin panel tube. The HMV 1920. The light dependant cell has a 100Kohm shunted across it. Today, that resistor was replaced with one of a 18Kohms. Might even consider reducing the value to 10K. Picture contrast is improved by a considerable amount. I'm assuming the LDR is a Mullard ORP60. No markings on it. DFWB. Attached Thumbnails