Re: Ancient Rectifiers

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mike Harrison by way of Terry Fritz <twftesla-at-uswest-dot-net>" <mike-at-whitewing.co.uk>

On Sat, 03 Feb 2001 20:53:11 -0700, you wrote:

>Original poster: "Dr. Duncan Cadd by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <dunckx-at-freeuk-dot-com>
>
>Hi Matt, All!
>
>Date: 02 February 2001 02:15
>Subject: Re: Ancient Rectifiers
>
>
>>> Does anyone have knowledge of/remember/ever seen large
>rectifier tubes
>>> (~12in. high) with screw bases like a lightbulb? I know
>they are rated >100
>>> kV with 6.3 v / 6 amp filaments. Two are VR-17C, one is a
>VR-6-CFR and
>>one is
>>> a Machlett ML-46-E.
<snip>
>The filament needs to be at ground potential to be used with
>a conventional heater transformer, and you earth the heater
>transformer winding preferably at a centre tap; this
>unfortunately means that without special filament
>transformers insulated for say 30kV you are restricted to
>half-wave rectification using only a single tube in the
>grounded line.  

..or you could use a battery!