Wei-Ya Chassis reference

You have to know some specs of the yoke and tube you're going to use and select the appropriate universal chassis:

Low impedance yoke, 10 pin (29mm diameter) tube neck, requires isolation transformer. Model 1220-H for 19" tubes.

Low impedance yoke, 8 pin (22.5 mm dia) tube neck, requires isolation transformer. Model 1220-S for 19" tubes

High impedance yoke, 10 pin (29mm dia) tube neck, requires isolation transformer. Model 820-H for 19" tubes. Works well to convert an Atari Disco standard resolution monitor.

High impedance yoke, 8 pin (22.5mm dia) tube neck, requires isolation transformer. Model 820-S for 19" tubes.

Low impedance yoke, 10 pin (29mm dia) tube neck, does not need an isolation transformer. Model 2620-H for 19" tubes. Model 2420-H has a contrast control.

Low impedance yoke, 8 pin (22.5mm dia) tube neck, does not need an isolation transformer. Model 2620-S for 19" tubes. Model 2420-S has a contrast control.

High impedance yoke, 10 pin (29mm dia) tube neck, does not need an isolation transformer. Model 2820-H for 19" tubes.

High impedance yoke, 8 pin (22.5mm dia) tube neck, does not need an isolation transformer. Model 2820-S for 19" tubes.

Add a "-R" suffix to any of the above model numbers if you want a model supplied with a remote adjustment board. They normally have all adjustments on the monitor main board.

You have a high impedance yoke. Your chassis appears to need an isolation transformer and the tube number indicates 29mm neck (CR23).

The following Wei-ya chassis will work:

820H or 820HR (requires isolation transformer)

2820H or 2820HR (does not need isolation transformer)

1820H (requires isolation transformer)

320H (requires isolation transformer)