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As I mentioned before, I am going to use a borosilicate glass in combination with tungsten wire. This glass is used in labs for scientific glass blowing, so the first place where I started to look for that glass were e-shops with lab supplies. There ale lots of suppliers, but all want some minimum quantity to order – tens or hundreds tubes of each diameter. But I had a luck, I found a 60% sale on 1500mm tubes, diameters from 12 to 20mm and a some 42mm, there were no minimum quantity needed. The glass brand is Simax, it is czech manufacturer.
Now I am looking for 6mm tubes, I will probably have to buy huge amount of tubes 🙁 ..