Re: Tube Coil

• To: tesla-at-pupman-dot-com
• Subject: Re: Tube Coil
• From: richard hull <rhull-at-richmond.infi-dot-net>
• Date: Sat, 1 Feb 1997 09:05:20 -0500 (EST)
• Subscriber: rhull-at-richmond.infi-dot-net Sat Feb 1 21:37:56 1997

At 11:16 PM 1/31/97 -0700, you wrote:
>> Subject:       Re: Tube Coil
>> Subject: Re: Tube Coil
>> >Subject: Tube Coil
>
>Subscriber: rwstephens-at-headwaters-dot-com Fri Jan 31 23:11:09 1997
>Date: Fri, 31 Jan 1997 20:59:05 -0500
>From: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Tube Coil
>
>> Date:          Tue, 28 Jan 1997 23:16:16 -0700
>> From:          Tesla List <tesla-at-poodle.pupman-dot-com>
>> To:            Tesla-list-subscribers-at-poodle.pupman-dot-com
>> Subject:       Re: Tube Coil
>> Reply-to:      tesla-at-pupman-dot-com
>


>
>
>Stephen, Richard, All,
>
>I'm now putting the finishing touches on a compact tabletop vac toob TC 
>that uses four 811-A's in parallel running from a microwave oven 
>xfmer.  I found room between the primary winding and the core on the 
>microwave xfmer to squeeze exactly six turns of #14 AWG solid copper, 
>PVC covered wire in there.  By winding it around the primary it is 
>not subject to magnetic shunt current limiting like the HV winding.  I also
made
>a center tap at three turns for the DC path in the cathode circuit.  This
puts out
>almost exactly 6.3 volts to the bank of 811's and eliminates the
requirement of a 
>second filament transformer.  Only trouble is you cannot run a variac 
>for variable plate supply power.  I will post more on this compact 
>coil system soon.  BTW, it *really* puts out!  My secondary is 14 inches long 
>and today I've achieved the full coil length in raging output brush fire. : )
>
>rwstephens 
>
>

Robert,

Nice idea and attempt at avoiding the need for securing a separate fil tranny!

R. Hull

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