12-12-2013, 04:47 AM
That was very interesting 
The coating on the european tubes had connection to one of the pins as well. But why the coating peeled off on some tubes I have no idea. I think it has something to do with how they where kept over the years. We had a danish tube factory in the 30's I think, and it was called Oxytron. I'm not sure if they made some of their own types too, or if they made direct replacements only, just giving them another type number such as Philips E443H is identical to Telefunken's RES964 and Valvo's L496D and so on. But I know Oxytrons where not quality tubes...
Jan
The coating on the european tubes had connection to one of the pins as well. But why the coating peeled off on some tubes I have no idea. I think it has something to do with how they where kept over the years. We had a danish tube factory in the 30's I think, and it was called Oxytron. I'm not sure if they made some of their own types too, or if they made direct replacements only, just giving them another type number such as Philips E443H is identical to Telefunken's RES964 and Valvo's L496D and so on. But I know Oxytrons where not quality tubes...Jan
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
