Hi
With reference to the display fading only.
You are probably seeing a little understood / acknowledged problem with the high value resistors around the CRT. They normally go high in value with applied voltage, this effect can take a considerable time to fully occur. 15 to 20 minuets is quite common.
To fix replace the resistors with high working voltage ones from the likes of the Vishay VR26 range.
George G6HIG UK On Friday 28 February 2025 at 04:18:38 GMT, saturn.v2000 via groups.io <saturn.v2000@...> wrote:
Hi All
Have two issues with my Tek 2246 scope display. Looking for common faults before digging in.
1) Display brightness fades after approx half hour after power on. Display geometry is fine, it just dims
2) Display seems to have a slight flicker . . . it's also noticeable on the green LED's illuminating buttons
Bought it in not working condition. Replaced rectifier in -15VDC supply. All now working well except these two issues.
All other supply voltages look steady, although have not taken time to look at any ripple/abnormalities.
Thanks in advance,
Mike
