The Medway Handyman wrote:
Andrew Gabriel wrote:

These were 4' tubes, not sure of the wattage.

on, the unchanged tube still worked fine, but the other two flicked
on and off alternatively. You could see that one end of the tubes
was getting hot,

How could you see that?

One end looked red and felt hot.


Wrong starters possibly. Do the fittings have loose end-caps
which could have been cross routed to the wrong tube-ends?

No, the end caps were firmly fixed in place and all the wires tied in.

The 2 end filaments are in in series during start on glow start
fittings. They will always get the same power, and thus glow the same
colour. (Thermionic emission does not affect colour) If the tube ends
are glowing different colours, something's wrong, maybe a wiring fault.

With 4' tubes check youre not using:
a 4-20w statrer
a 100-125w starter
a series starter


NT