[Amps] Another Plate Transformer Question

[Will Matney]

Don,

The closest stock lam I could find has a 1-3/4" center leg. At 8 inches deep, that would give 8 X 1.75 = 14 sq. inches. Working the reverse formula;

P = ( a / 0.16 ) ^2

P = ( 14 / 0.16 ) ^2

87.5 ^2 = 7,656.25 watts or round it off to 7500-7600 watts at 12 kilogauss and 60 Hz.

To check ourselves;

a = 0.16 X sqrt of P

sqrt of 7,656.25 = 87.5

a = 0.16 X 87.5 = 14 sq inches.

A rough TPV is 5 / a ;

5 / 14 = .357 or about 3/8 turns per volt.

Keep in mind this is a ball park figure and would have to be checked using the long formula but will be close.

Hope this helps some.

Best,

Will


*********** REPLY SEPARATOR  ***********

On 5/5/05 at 10:39 AM Don Lemley wrote:

>Thanks Will,
>
>The measurements are: 5 1/2" Height, 4 3/4" Wide, 8" Deep.
>The end bells look to be made of some "cast" metal, with the legs being
>about 3/4" wide, and 3/16" or more thick.  The connections are made
>through
>porcelain insulators on each side of the transformer, primary on one
>side, secondary on the other.
>
>Thanks,
>
>Don Lemley - W8HRQ
>w8hrq at comcast.net
> 
>
>-----Original Message-----
>From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
>On Behalf Of Will Matney
>Sent: Wednesday, May 04, 2005 10:46 AM
>To: amps at contesting.com
>Subject: Re: [Amps] Another Plate Transformer Question
>
>Don,
>
>What's the height, width, and depth of the core. Also measure the width
>of an outside leg. I can ball park the power but without knowing the
>wire size, wont be sure whether it's CCS or ICAS, or the exact power.
>
>Best,
>
>Will
>
>*********** REPLY SEPARATOR  ***********
>
>On 5/4/05 at 9:13 AM Don Lemley wrote:
>
>>I just ran on to a HB power supply that looks to have been built for a
>>tetrode amp of some sort, with hollow state electronic regulated 350V
>>screen supply, etc.
>>However, I don't know the actual ratings on the plate xfrmr, and the
>>power supply needs several electrolytics replaced, etc before I can
>>bring it up.
>>My question is, does anyone know the specs on a Thordarson T-21P83
>plate
>>xfrmr?  I have checked the catalogs that I have been able to find,
>>including the 1938/39 and 1942, as well as the newer Catalog #76, but I
>>don't find any reference to this puppy.  My guess is that this thing
>was
>>designed for a half gallon amp, but the screen supply is much too large
>>for that, and the plate transformer also looks to be a little large for
>>a half kw, so I could use some help if someone has a catalog that lists
>>this thing.
>> 
>>Many thanks in advance,
>> 
>>            Don
>> 
>>Don Lemley - W8HRQ
>>w8hrq at comcast.net
>> 
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>
>
>
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