How to replace butterfly tube

Maybe because those pesky electronics designers have caught me out on that one :oops: was thinking in terms of magnetic chokes...
The one I'm looking at is a magnetic jobbie, non-HF, traditional starter can, a couple of flickers and "bangs" as it starts up...
 
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Why am I looking at a ballast now which says it can take 1 x 18W or 1 x 23W or 1 x 24W or 1 x 26W lamps?
Most chokes have an "L" after the wattage as it is sized for linear lamps
An 18/20 "L" linear choke also does 18/24/26/28 watt compact lamps.
It is quite often found
A 16 watt 2d has a 16 watt magnetic choke
A 28 watt 2d only has a 20 watt magnetic choke
 
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Mine's a Tridonic EC 20 B90 - not all of those numbers relate to the rating, but I cannae remember which. Think it's the B90 part.
 

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