After a loong but beautiful research journey i managed to do it guys
As you know from previous posts i had already get all the dirt and rust (battery leakage/white strange material) off from the bell and upper chassis. After that i just coated them using 3 layers of simple acrylic metal spray varnish.
About the two de-attached laminations now, after many hours of reading, thinking and asking many people, i finally talked with a guy that makes his own tube amps and transfos from scratch. Being experienced in coils, he suggested me to call a company that sells raw materials for making transformers to customers and large companies. Coils, motors, laminations, varnishes and all that kind of stuff. The engineer guy there was kind enough saying to avoid any common wood varnishes and told me to go straight for Electrical Insulated Varnish, Polyester based. You know, industrial pro stuff like Dolph's AC-43 Varnish for insulatin and potting transfos and coils.
http://www.sinadinos.gr/pdf/ALBESIANO%20AC-43%20ing.pdfHe indroduced me immediatelly to co-operate company that repairs and makes transformers, coils and motors here in my town, i went there with an empty can and in 5 minutes the guys there offered me about 1/2 litre local Clear Air Drying Electrical Insulated Varnish for free ! The varnish is called "Elektrotek 428" and i think it's the local equivalent of AC-43. They use them in large quantities so when i went there handling two small laminations they laughted
https://www.sinadinos.gr/pdf/Electrotek_428_en.pdfAs an answer to my question about "if this will be OK for audio transformers etc." i wa told that it would not be a problem even if i would give a bath to the whole transfo into the liquid, that's what they use for potting.
So i went home, glued the two laminations with it clamped for 12 hours, then applied another two layers of it to the whole outside laminations and let dry for about two days. The transfo is sealed like never before, having covered any "bare lam areas etc", it is a insulated tank
The "bad" thing is that i cannot get my hands in it any time in future as it is almost impossible to deassemble the lams anymore. I don't know if it is "bad" but i don't see any reason of doing this, even if there is some small ammount of rust already inside laminations that i cannot see, i mean i cannot do smthng for that (well except for with Fertan that it is said to can acces into lams and convert the rust anyway), this rust could maybe reach the core someday, i couldn't do many things for thisanyway. I don't know if the lams must "breath", but i don't think so, as that's the way they do it from factory, i mean, they seal them right?
In the end of the day, i re-assembled the whole thing back, bells, wires everything, soldered back to chassis underneath, fired it up and all work GREAT !
Measured power voltages, all perfect, i got 274-275 V. at the first filter cap and 229-230 V. in the second !
Multimeter always moving between "274 and 275" , "229 and 230", it never gets stabilised at "275" or "230", but i guess this 1 V. isn't a big deal right?
Was measuring about half an hour and exactly the same steady numbers.
What do u think guys ?
