Magnetic Resonance Devices based on Don Smith Concepts

[forest]

Are the caps of Don Smith primary polarized ones or not ?

[Yucca]

Are the caps of Don Smith primary polarized ones or not ?

In the tabletop device he shows on the video I think the primary caps are unpolarised.

[minde4000]

Are the caps of Don Smith primary polarized ones or not ?

@Forest
If you are planning on building one get caps from Custom Electronics like Don Smith has on his primary (also would fit secondary) . They are mica caps and seem to be one of the best cap type for frequency ranges 0~200khz. They are not cheap but quality and specs will suite this amplifier. Of course going for Mhz range nothing beats variable vacuum caps but... they are very expensive.

Minde

[forest]

I don't know if anybody noticed but his tabletop device secondary mimic primary. Strange.Do you have schematic of his NST ?

[Yucca]

Good fast fixed value caps are "doorknob capacitors", a search on ebay will give a few hits, they are fast and have very low ESR, ideal for high Q LC tanks. One of these paralleled with a variable vacuum for tuning would be pretty good I think, thats what HAM radio guys use.

edit: marcos photos contain a few doorknob caps.