"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