[Amps] tuned choke

[John T. M. Lyles]

Skipp
Tuned to resonance with no load, when you need it the most. When 
current load is increased, the tuned choke's equiv impedance falls to 
that of inductive reactance alone as the L changes (drops). That is 
enough for regulation under higher current.

>
>
>re: tuned filter power supply
>
>Is the target 'trap' frequency actually 120 Hz or
>slightly above it?
>
>skipp
>wv6f
>www.radiowrench.com
>
>--------- Forwarded message ----------
>From: "John T. M. Lyles" <jtml at lanl.gov>
>To: amps at contesting.com
>
>The cathode (-) power supply may have a large steel canned capacitor
>around 1 uF. It is rated for high AC voltage in doubler service, and
>is usually polypropylene dielectric. If it is rated for few kV, it
>makes a very nice capacitor for tuned filter power supplies, across
>the appropiate choke to make a 120 Hz parallel 'trap'.
>
>John
>K5PRO