Re: [TCML] 7.5V 52A Filament Transformer for 3CX3000 Needed

["Quarkster" <quarkster@xxxxxxx>]

Cameron -

Another option (regardless of what transformer you use) is to use a variac 
on the primary side of a filament transformer. This allows you to have 
superior control over inrush current as well as being able to precisely 
adjust filament voltage at the tube socket.

I appreciate your desire to use a commercially-made, appropriately-rated 
transformer as it just makes a "professional" appearing setup, better than 
any "home-brewed" transformer could.

Regards,
Herr Zapp

----- Original Message ----- 
From: "Cameron B. Prince" <cplists@xxxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, June 14, 2009 12:30 AM
Subject: Re: [TCML] 7.5V 52A Filament Transformer for 3CX3000 Needed


> On 6/12/09 6:21 PM, "Dr.Hankenstein" <dr.hankenstein@xxxxxxxxxxxxx> wrote:
>
> > Normally, filament xfmrs should be chosen to approximate the max load.
> > The reasoning behind this is as follows:
> >
> > Filament resistance is very low at start up, thus causing heavy inrush
> > current that could damage the filament.
> >
> > By closely matching the xfmr impedance to the filaments' maximum
> > operating  current, the inrush can be greatly reduced, resulting in
> > longer filament (and tube)life.
>
> This, along with my desire to build something of high quality, is 
> precisely
> why I'd rather not go with the "homebrew" method. I should have prefaced 
> my
> original request with the requirement that any replies be related to
> commercially built transformers running at their rated input voltages
> designed for the specific application mentioned.
>
> Money is always an object, but in this case, I'd rather pay for the proper
> transformer and be safe rather than sorry.
>
> Thanks,
> Cameron
>
>
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