If I'm not mistaken, incandescent lightbulbs are virtually unavailable in Switzerland (since the early 10's), except for oven lightbulbs.
They are not outright outlawed, but it has something to do with a minimum level of efficiency mandated by law.
Anyways, most LED lightbulbs available at Coop etc. are non-dimmable. Perhaps that's the reason why they don't work with your lamp?
Nonetheless, if you want an LED dimmable lightbulb, Coop has a few in their assortment (only those with a yellowish light). Alternatively, Migros sells a smart LED lightbulb (CHF 20.-) that is indeed dimmable and covers a large spectrum of colors and not just that yellowish light.
Thanks for the replies. I tried local bau and hobbies and they don’t sell incandescent in e14 fitting. And leds don’t dim well, often buzzing and inconsistent especially at low levels. Maybe I’ll give the Amazon.de ones a try
Switzerland banned the sale of all light bulbs of the Energy Efficiency Class F and G, which affects a few types of incandescent light bulbs. Most normal light bulbs are of Energy Efficiency Class E, and the Swiss regulation has exceptions for various kinds of special-purpose and decorative bulbs.[1][72]
In line with EU rules, Switzerland banned the import and manufacture of halogen light bulbs in September 2018.
Not sure what you need the bulbs for but I understand the problem. I have 2 lamps by Eglo with touch dimmer function which use an E14 base bulb. The lamps are not that old and yet finding a bulb to work in them is a challenge. Even the bulbs suggested by Eglo can't be purchased in Switzerland.
I don't know if it is any help but when this ban first came in for EU there was an exemption for "professional use" (eg industrial inspection lights). The bulbs for this were tougher, thicker glass, and hugely more expensive but worked fine for old style dimmer switches. They were stocked in professional tool stores and builders merchants not in normal electrical shops.
Honestly can't recall if the exemption was permanent or transitional (as so many are in EU legislation). It must of course be a small niche so maybe even if still legal it may not be cost effective to manufacture. A long shot but worth a try if this is your only solution?
If you are renting, it's difficult but if you own the place, you really need a long term solution rather than try and source incredibly energy-inefficient filament bulbs.
Many online electrical shops sell dimmable LEDs but you are right - they are not too good with rheostat dimmers but the newer ones are much better.
The dimmers in my place are wearing out and I'm replacing them with push-button switches (setting them as momentary switching) and fitting an electronic dimmer behind the plate. This has the added bonus of allowing external control via a zigbee (Philips Hue) network).
Quick update - bought some incandescent from Amazon and they seem to do the job. Time will tell how long they last, but dim to low level, nice warm light and no buzzing
My main dining room light fitting is LED and dimmable. It works beautifully. No buzzing even at the lowest level. It guess it's retrofitting that's the issue.