[Amps] 500 uh plate choke

[Vic, K2VCO]

This site

http://www.granta.g4axx.com/Linear_design_notes.php3

mentions a 500 uh plate choke specified as RF Parts no. RFC-4L. They 
tested it and report that it has no series resonances between 1 and 100 
mHz! RF parts doesn't list this choke anymore. I would like to obtain 
such a choke -- does anyone know if it is manufactured and if so who 
sells it?

Yes, it sounds too good to be true, but the site is very authoritative. 
They mounted the choke in a box and used a vna to check it.

-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/