[Boatanchors] Ohms Law

[Ian Wilson]

Good info, thanks Barrie. If you do have a chance to measure the 'fixtures'
that would
be interesting.

73, ian K3IMW

On Tue, Apr 20, 2010 at 11:59 AM, Barrie Smith <barrie at centric.net> wrote:

>
>
> ----- Original Message -----
> *From:* Ian Wilson <ianmwilson73 at gmail.com>
> *To:* Barrie Smith <barrie at centric.net>
> *Cc:* Boatanchors Mail List <boatanchors at mailman.qth.net>
> *Sent:* Tuesday, April 20, 2010 7:30 AM
> *Subject:* Re: [Boatanchors] Ohms Law
>
> Hi Barrie,
>
> How are you supporting and connecting to the VT-127A's (projects ideas
> forming here!)?
>
> 73, ian K3IMW
>
> Ian:
>
> I'm fortunate in that I have four sockets (or, "fixtures", as Eimac calls
> them).  If I didn't have the sockets, I see no real problem making something
> up that would work.
>
> If you like, I can make some measurements and send them to you.
>
> Whatever it is that will be holding the filament pins must be able to
> float, or move slightly.  The tube gets quite hot even with just filament
> voltage applied, so the spacing on the two filament pins will change between
> hot and cold and they must be able to move.
>
> The sockets I have are built so that there is some spring-like tension on
> the pins when they are inserted.
>
> Eimac, or someone, made heat dissipating connectors that worked in the same
> fashion.  I'd start with a pair of those.  RF Parts carries them.  They even
> know what a VT-127A is.
>
> I'm using the same connectors for the grid and plates.
>
> 73, Barrie, W7ALW
>
>
>