Hard circular fluorescent lamp revusured

I replaced the lamp with a new one.So far everything seems o. I did take
some measurements.
The circular lamps are mad with two filaments at end. That enables them
to start with old fashioned glow starters. In my case, the quick start
method is used. The filaments act like electrodes. If you can start them
by hook or crook you do not need intact filaments.
What appeared to have happened in my lamp was that one of the filaments
opened up. Apparently the filament was still connected at one end and
that was good enough. I just checked the continuity of the filaments.
One was ok and the other not.
I hung the new lamp by its connector. It did not start spontaneously.I
think that having the lamp in its fixture helps starting. It is held in
place by three spring clamps. That extra capacitance to ground is
probably important. For the few dollars a new lamp costs it is not worth
tracking down the failure any further. I continue to have starting
problems, I will post again.