[Collins] Several technical questions

[Dr. Gerald N. Johnson, electrical engineer]

1. read the power supply chapter in any vintage ARRL handbook. Vacuum
tube rectifiers prefer choke input to limit the rectifier peak currents.
With small capacitors, choke input filters tend to produce better
voltage regulation, but significantly lower DC for the given AC input.
Silicon rectifiers handle large peak currents thus can use large filter
capacitors and charge to nearly the peak of the AC.

Transformer coupled modulation tends to always be better quality.

The trade off of choke location is that putting the choke in the center
tap (relatively unconventional) adds voltage stress to the transformer
insulation at the center tap. Its a trade off of stressing the
transformer insulation or the choke insulation.

There may be lighted meters at a hamfest, like taken from something EFJ.

73, Jerry, K0CQ

-- 
Entire content copyright Dr. Gerald N. Johnson. Reproduction by
permission only.