Hantarex pico width problem

[p.diavolikis]

Hello from Greece
I have a monitor Hantarex pico and the problem is that my screen is too small.When i adjust from h amp trimmer the screen reaches a point just like i had 20 inches screen(maybe smaller)...I changed the coil and all the caps but nothing happens.When i adjust coil its not working.Can you help me please?
Thx

 

[M K L]

I don't get the "20 inch" part. What tube size are you using? Tube type number? The Pico is made to drive 14" through to 21" tubes.

This should have been posted in the tech sub forum.