Powering a TC with a stereo amp

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Powering a TC with a stereo amp
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Tue, 2 Jun 1998 23:20:15 -0500
• Approved: tesla-at-stic-dot-net

----------
From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent:  Tuesday, June 02, 1998 12:34 AM
To:  Tesla List
Subject:  Re: Powering a TC with a stereo amp

Hi Jim,

> From:  Jim Lux [SMTP:jimlux-at-Earthlink-dot-net]
> Sent:  Monday, June 01, 1998 1:54 PM
> To:  Tesla List
> Subject:  Re: Powering a TC with a stereo amp

<snip> 
> The real problem is efficiency. It turns out that a spark gap is a
> pretty efficient switching device in terms of power lost in the gap
> compared to the power being switched. A tube coil, operating Class C, is
> going to be 60-70% efficient. A Class AB stereo amplifier is going to
> be, at best, 50% efficient. A spark gap scheme could easily have an
> efficiency of 80-90% (although it has other problems, like exponential
> decay, etc.)

Actually it has a linear decay (worse than exponential). I have 
measured a transfer efficiency of about 88% in a small coil. The 
quicker you get the energy across (higher k), the less power it can 
lose.

Malcolm

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