Solartron CD 1400 Oscilloscope Refurbishment - Page 4 - UK Vintage Radio Repair and Restoration Discussion Forum

mark_in_manc · 24th Jul 2020, 6:05 pm

Quote:

Originally Posted by Chris55000

I get notified of new listings every day practically, but so far only seen one unit with an orange CRT and no blue ones yet!

Chris Williams

(My apparently 'orange' one turns out to be an orange gel in front of a screen which is more or less bright blue-white. I also have a green one somewhere, which might be similar).

TonyDuell · 24th Jul 2020, 6:10 pm

My CD1400 has a CRT phosphor that gives a green trace with a long (couple of seconds) blue afterglow. There is no colour filter in front of the tube, just a clear graticule.

DMcMahon · 24th Jul 2020, 9:12 pm

Before refitting Board 3, decided to monitor the 2 regulator neons.

V301 voltage is 84.8V and V302 is 87.4V (V302 a little higher than spec).

The current drain on V301 at min brightness is 0.25mA and at max brightness increases to 1.11mA, with normal viewing brightness the current is around 0.27mA

Disconnecting A3U reduces the current to a very low value, but toggling +ve/-ve

The current drain on V302 (the lower not visible trace) at min brightness is 0.25mA and at max brightness increases to around 0.9mA

Disconnecting A3U reduces the current (once again) to a very low value but toggling +ve/-ve, I disconnected A3U by mistake , meant to have disconnected A3L.

David

24th Jul 2020, 6:10 pm	#62
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: Solartron CD 1400 Oscilloscope Refurbishment My CD1400 has a CRT phosphor that gives a green trace with a long (couple of seconds) blue afterglow. There is no colour filter in front of the tube, just a clear graticule.

24th Jul 2020, 9:12 pm	#63
DMcMahon Dekatron Join Date: Apr 2019 Location: Worthing, West Sussex, UK. Posts: 6,603	Re: Solartron CD 1400 Oscilloscope Refurbishment Before refitting Board 3, decided to monitor the 2 regulator neons. V301 voltage is 84.8V and V302 is 87.4V (V302 a little higher than spec). The current drain on V301 at min brightness is 0.25mA and at max brightness increases to 1.11mA, with normal viewing brightness the current is around 0.27mA Disconnecting A3U reduces the current to a very low value, but toggling +ve/-ve The current drain on V302 (the lower not visible trace) at min brightness is 0.25mA and at max brightness increases to around 0.9mA Disconnecting A3U reduces the current (once again) to a very low value but toggling +ve/-ve, I disconnected A3U by mistake , meant to have disconnected A3L. David Attached Thumbnails