So, in the Model III Riser thread I started down a path around CRT swap.
Turns out I ordered the wrong CRT , the 1204 note the 1208 that Ian has been using.
I got the specs from Gina today and compared the two and it looks like, from my VERY limited knowledge of these magical devices that the 1204 has more "tolerance" of the voltages and might explain why that fellow up in Nashville was having fits getting his to work. The one thing I haven't looked into yet is why the 1204 has 1200 lines of resolution listed and uses grid drive when the 1208 uses cathode drive. Those of you who know this stuff, is this worth a shot to try out?
Here are the differences:
Turns out I ordered the wrong CRT , the 1204 note the 1208 that Ian has been using.
I got the specs from Gina today and compared the two and it looks like, from my VERY limited knowledge of these magical devices that the 1204 has more "tolerance" of the voltages and might explain why that fellow up in Nashville was having fits getting his to work. The one thing I haven't looked into yet is why the 1204 has 1200 lines of resolution listed and uses grid drive when the 1208 uses cathode drive. Those of you who know this stuff, is this worth a shot to try out?
Here are the differences:
Code:
1204 1208
Heater Voltage. 12.0V 11.0V
Heater Current. 75ma 140ma
Antireflection treat Y N
Length 275mm 280mm
Grid No 4 -550 to 1100 -200 to 500
Grid No 2 Max 1000 200
Grid No 2 Min 200 80
Max Heater 13.2 12.65
Min Heater 10.8 9.35
Max Heater-Cathode 450 130
After warm up 200 110
Grid Drive Cathode Drive
Grid no 4 Voltage 0-400 DC 100-200 DC
Grid no 2 Voltage 400 130
Grid no 1 Voltage -33 to -77 DC -45 to -65
Resolution 1200 Min Line Not listed (Cathode)
