Videokarma.org TV - Video - Vintage Television & Radio Forums

Videokarma.org TV - Video - Vintage Television & Radio Forums (http://www.videokarma.org/index.php)

- Diagnostic & Test Equipment (http://www.videokarma.org/forumdisplay.php?f=177)

- - Tektronix 516 (http://www.videokarma.org/showthread.php?t=275774)

DavGoodlin

04-12-2023 02:00 PM

Tektronix 516

1 Attachment(s)

I have an issue with the Intensity control not having much effect on brightness, then all traces fade out after 10 minutes.

The schematic shows a circuit that controls bias on the CRT via R828, a 1 Meg.

Could it be as easy as one bad resistor?

Attachment 205683

old_tv_nut

04-12-2023 04:41 PM

The image is really hard to read. Are you referring to the resistor in series with the intensity control?

Also, have you checked the three rectifier tubes?

jr_tech

04-12-2023 07:51 PM

Better images here:

https://w140.com/tekwiki/wiki/516

I would suspect the 3 caps near the intensity pot. :scratch2:

jr

DavGoodlin

04-17-2023 08:49 AM

Thanks!. I will try the 5642's, I have a spare as well.

All times are GMT -5. The time now is 02:14 PM.