813 tube coil

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: 813 tube coil
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Mon, 1 Jun 1998 00:26:21 -0500
• Approved: tesla-at-stic-dot-net

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From:  Alan Sharp [SMTP:AlanSharp-at-compuserve-dot-com]
Sent:  Saturday, May 30, 1998 5:46 PM
To:  Tesla List
Subject:  813 tube coil

Greetings All,

At the UK Teslathon I bought a couple of 813 valves -
Has anyone used these for a tube coil? - is there a good
schematic out there?

I've never used tubes before - I think they need a heater -
will a bunsen burner be all right :)

I have checked out the specs 2.5kV, at 225mA - so in
theory a pair of these - and a 2.2kV microwave transformer
and I should be able to shoot for 1kw power output.
But they are  pentodes (and I only understand triodes)

The filament needs 10V at 5A - can I simply connect
a 5-0-5V transformer or do I need to have a way of
adjusting and correcting the current?

Hints, tips, help greatly appreciated.

Have fun,

Alan Sharp UK

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