The problem with the dimmable lamps I've seen is that you can't use a normal dimmer switch - to dim them you need to fit a normal switch and flick it on an off a number of times to dim it to the required level.
That's more or less what a modern dimmer switch does -- it switches on/off rapidly, though the intent is to chop off the peaks of the AC waveforms each cycle, rather than a full on/off sort of thing.
Really old dimmers (from the 60s) were resistive based, and would likely not work. And are a bit of a fire hazard anyway, so one really should have scrapped them decades ago.
Cheers
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