28-04-2021, 08:45 AM
Thanks Ed! I looked - couldn't find one by regenfreak, but there is another from a couple of months ago, which I contributed to (I'm rather interested in tracking ATM.)
There's really two issues - the designers faced with getting appropriate L and C values for really good tracking, and the engineers who then have to arrange for sufficient adjustment to absorb production tolerances within the exigencies of cost constraints.
Sometimes fixed values are nearly spot-on - the Ever Ready Model K that I have is an example. Sometimes tracking is mediocre - the Cossor 500 that I have is an example.
But Amie's post about the 5216 describing the frame aerial adjustment is interesting. It means that the 5216 left the factory as good as it could be, even if realignment in service later on, maybe after something needed to be replaced, is rather difficult (a bit like Philips's IFT's trimmed by rolling a groove in the can, or their trimmer capacitors adjusted by stripping turns of wire off the outside of a ceramic tube).
There's really two issues - the designers faced with getting appropriate L and C values for really good tracking, and the engineers who then have to arrange for sufficient adjustment to absorb production tolerances within the exigencies of cost constraints.
Sometimes fixed values are nearly spot-on - the Ever Ready Model K that I have is an example. Sometimes tracking is mediocre - the Cossor 500 that I have is an example.
But Amie's post about the 5216 describing the frame aerial adjustment is interesting. It means that the 5216 left the factory as good as it could be, even if realignment in service later on, maybe after something needed to be replaced, is rather difficult (a bit like Philips's IFT's trimmed by rolling a groove in the can, or their trimmer capacitors adjusted by stripping turns of wire off the outside of a ceramic tube).
