Hi Max
https://threeneurons.files.wordpress.com/2015/05/3lo1i.pdf
gives the normal operation acceleration anode A2 voltage as 500V (WRT
cathode) and the focus anode A1 as 0 to 50V. Your voltages are higher,
especially the focus anode voltage. Hence the green splat rather than a dot.
My experience with this tube and the 6LO1i which is the slightly larger
rectangular version is very poor. The phosphor literally turned grey,
then black and the light emission faded over a couple of months in use.
It wasn't that the phosphor burned with the image but the phosphor
greyed uniformly. Most odd. Might have it been a bad batch of tubes?
IIRC someone else has seen this effect.
If you want a small tube then look out for a 1CP1 or DH3-91 or CV2302
would be my suggestion.
Grahame
On 24/11/2023 22:49, Max DN wrote:
Hello,
I managed to successfully build a scope clock almost entirely based on
Cathode Corner design using CRT 3RP1A.
I happen to have a 3LO1i (I know it only lasts for 1000 hours...) and
I tried to modify the voltage doublers to use my circuit with this CRT
but I'm not too sure about the correct voltages. At the moment I have:
Grid: -480V; HTR2: -380V; HTR1: -384V; HTR1-HRT2: 6.3VDC; CATH: -384V;
A1: -248V; A2: +200V
However I cannot get a small green dot, only a wide green shade,
picture attached.
I'm sure I'm doing something wrong with the voltage divider. Any
suggestions please?
Thank you,
Max
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