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Originally Posted by kbmuri
Ok, I had to research all this.
I was already misinformed about the "A"-meaning-aluminized rumor before hearing Tubejunke say it a couple of posts ago. I'm sure I read it here on the forum. Just need to make it clear that that's inaccurate and shouldn't be propagated in the future. A is just A. My sources: Sylvania Tube manual (1955), and Radio Shack Tube Substitution Guide (1975).- Kirk
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Man you need to chill out and thank your lucky stars to be a part of a group of people who at least give a rats a** about your problem. If this were a be perfectly correct all the time forum, what would we have? I love the way many of us simply give educated guesses (some uneducated) just trying to help someone with a clue as to what is going on with a given situation.
Sure now I could see somebody getting steamed if someone led them into physical harm or something. Man, nobody told you to place the HV anode to the crt in your mouth to check for low voltage. Did they?
The craziest part is the fact that we are both using some of the same information and also have some of the same conclusions. AGAIN my info comes from my 4th printed revised edition of the Sylvania Electronic Products Technical Manual-1958
I will state what is clearly said in this very informative manual. The 16RP4 in ANY form is a tube that needs a 35 Gaus, single field ion trap magnet. "The Sylvania type 16RP4A is identical to the 16RP4 except for having an aluminized screen". What I make out of studying this manual is also that "A" does not necessarily mean aluminized. Again case in point the 10BP4A for instance has what is refered to as a "gray filter glass faceplate". No mention of aluminization. Also, I have found out the fact that just because a given tube may be aluminized does not mean that it has a "straight gun" and therefore needs no ion trap.
There is absolutely nothing that says that if a tube has an aluminized screen then no trap is required. Now there are many tubes that were built specifically to NOT require an ion trap. I am fairly certain that ion traps kind of faded out with the 50's. I myself, due to misinformation thought for a long time that if a tube had an aluminized screen than it DID NOT require a trap. I didn't get all bent out of shape about it. Really the person led me toward learning more about the whole ion trap mystery. Double field, single field, needed, not needed ect...
So I think it is an insult to everyone to imply that everyone should refrain from saying anything to try to help anyone unless it is verifyable as being BY THE BOOK. I'm not saying I have never made an incorrect statement on this forum but the Sylvania info is as by the book as it gets. Now there is a possibility of tech books not being completely clear but in this case I doubt it.
So SORRY if my attemt to lend a hand and do some free research did not fix your problem. Evidently some other idiot made the same mistake before me. I think I can speak for both of us and say sorry pal.... I WONT try it again.....