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![]() "Michael A. Terrell" ) writes: Gregg wrote: Behold, Michael Black scribed on tube chassis: Collins mechanical filters were always costly. Surely some of it is because they aren't simple to manufacture. Heh, where's the overseas knockoffs? -- Gregg "t3h g33k" http://geek.scorpiorising.ca *Ratings are for transistors, tubes have guidelines* Lafayette Radio used to sell them, but they are long gone. There wasn't enough of a market for the knock offs, either. And of course, for a lot of things ceramic filters filled the need for a filter better than a string of IF transformers (or a single crystal in a phasing arrangement), but at low cost. You see them in most cheap am/fm radios now, where their size and cost is likely why they are used, through shortwave receivers costing hundreds of dollars, to even ham transceivers (though in that instance they tend to be used in conjunction with some sort of better filter). And the ceramic filters do cover a lot of territory, going from those three terminal ones we see in the average am/fm radio, to multiple pole filters seen in those more expensive bits of equipment. Michael VE2BVW |
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