Quote:
Originally Posted by jeyurkon
That's partially true. If you look at the construction of CRT you'll notice that the aquadag, which is connected to the HV, extends back into the neck of the CRT. There are additional electrodes that we don't always think about. These are acceleration electrodes. The aquadag connects to the last electrode and the electrons reach their final velocity as they pass this electrode which happens before the beam passes the yoke.
While it may seem odd, the region past this last electrode inside the bell region is basically field free because it is all at the same potential.
John
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Y'know it IS embarrassin' to have been in the trade for 30 years and now long retired, and never given thought to that accelerating electrode being connected to HV via the internal coating of the jug. So the beam is in fact
not accelerating once it leaves that cylinder. Funny how such innocuous misconceptions can be carried for a lifetime unless someone corrects 'em. Thankya, John
Bill(oc)