On Mon, 15 Mar 2004 15:41:23 +0100, "A.N. Onym"
wrote:

Er...
Well. After a couple of Years, the resistance of the coil roller contacts
reaches
"irritating" high values, destroying coil Q.
Keep it clean! (tomato ketchup is a good cleaner!)



Reg Edwards wrote:

Ian,

Quite rightly, you blame the melt down of the tuner not to the tuner's
intrinsic inefficiency (which none of them have) but to the abuse inflicted
on it by the user with the help of a transmitter.

All tuners are high-efficiency devices when operated within their ratings.
They can't help being otherwise. They have only a length of wire in the form
of a coil and a condenser.
---
Reg.

Reg is right, because those roller coils are particluarly popular on
the opposite side of the atlantic ocean. Those rollers are usually
only optimum on the lowest frequencies and efficiency decreases when
you use a smaller part of the coil

----
Jan-Martin, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/