Finally, I have 3 lamps working.
Apart the performance of the mantles, one of these lamps emits much less light than the other two, and " roars" a lot less.
I bought some nipples from Pelam, but now looking again at the catalog, in the page Carburettor group I see that part # 50 nipple has a ( 350 ) near the part number. May be that this is the nipple for HK350 instead of HK500? ( I Have three HK500)
If so, can be the reason for a low performance?
What is the code of the right one?
Another possibility is dirt inside the group. ( the lamp has 25 years) .
I've chhanged the # 196 carburettor valve, and cleaned the remaining with compressed air, but I like to know if there is a right solvent to clean the residues that can be inside the parts.
Thank you and regards
Carlo Bianconi Italy
www.carlobianconi.it