[Tubejunke]

Hey kramden66, we have a good and valuable friend in old coot88! It's easy enough to tell that he did this for a living! I do it for a living as well, but I'm sure everyone has read enough of my soapboxing of the "dumbing down" of electronics. It's more or less a plug and play, or throw away world ever since the microprocessor was integrated into electronics. We don't really have a big need to know what used to be almost a given and really is just the fundamentals of electronics. Our knowledge base and training give us the capability and credentials to gain employment in the field; and yes I guess I take a lot of the knowledge for granted and I tend to forget that the average individual without some training doesn't know the difference between alternating and direct current.

Even we tend to forget aspects of the two types of current and their effect on capacitors as was proven by old coot88's reminder of a capacitor's behavior as an open circuit if placed in series with an ammeter and a DC supply. I hadn't really thought of it (or remembered), but it makes sense. With DC a capacitor is charged to its full capacity and then behaves like an open circuit with AC because of polarity reversal this charge and discharge cycle continue and the current continues to flow in the external circuit. There is no frequency with direct current, so there can't be capacitive reactance. X sub C = 2 x pie x frequency x capacitance if I remember right.

My HO tube doesn't look burned up, but when I first brought the set home there was no HV and the tube was red plated. It's been so long I don't remember all the specifics, but I think one of the tubes was damaged, maybe cracked. Seems like it was one of the tubes inside the HV cage. I replaced that and I think one other tube extenal of the cage that's related to sweep and gained HV and no red plate. It wasn't long before I discovered this coil and haven't had much power up time at all on the set. I didn't want to risk any flyback damage since I have read so much about it with these color sets which I typically never mess with, so my knowledge on a lot of the particulars of these sets is very limited.