UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Microvitec Cub 1431 Power but no picture.

qsilver · 22nd Mar 2018, 12:55 am

Came to the screen one day and powered it up and I've got nothing except the Red neon indicator and the sound of the degaus. I don't have any static on the screen at power up like you can sometimes get.

I thought this was a series 3 screen but after taking a closer look its a series 4 1431 MS4F.

My questions are, how safe is it to work on a CRT as I understand these use EHT.

How can I safely discharge the 22kV as I've seen no specific way to do it other than put a screw driver under the anode cap attached to an earth and that sounds a bit crude and dangerous to me.

Is this a common problem or does it point to a dead tube?

22nd Mar 2018, 12:55 am	#1
qsilver Retired Dormant Member Join Date: Jul 2010 Location: Carlisle, Cumbria, UK. Posts: 66	Microvitec Cub 1431 Power but no picture. Came to the screen one day and powered it up and I've got nothing except the Red neon indicator and the sound of the degaus. I don't have any static on the screen at power up like you can sometimes get. I thought this was a series 3 screen but after taking a closer look its a series 4 1431 MS4F. My questions are, how safe is it to work on a CRT as I understand these use EHT. How can I safely discharge the 22kV as I've seen no specific way to do it other than put a screw driver under the anode cap attached to an earth and that sounds a bit crude and dangerous to me. Is this a common problem or does it point to a dead tube?