Allied tube power transformer

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bitrex Contact options for registered users 's Avatar (by Gravatar) posted on
December 12, 2014, 12:32 am
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Several years ago I remember buying an Allied Electric branded
 power transformer similar to this one:

http://www.alliedelec.com/search/productdetail.aspx?SKU70%009000#t
ab=overview

But if I recall correctly the unit I bought was somewhat smaller;
 the primary had no center tap and the filament winding was rated
 for just 300 mA.  It doesn't seem to be on their site anymore.  
 Does anyone make a similar product?

At these power levels I'm wondering if it might be easier and
 cheaper to just use a switcher for B+.

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Tim Williams Contact options for registered users 's Avatar (by Gravatar) posted on
December 12, 2014, 11:11 am
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Re: Allied tube power transformer
http://www.hammondmfg.com/pdf/EDB262A12.pdf

Try Edcor too.

Or if you had an automotive application in mind,

http://seventransistorlabs.com/Images/Discrete_Tube_Supply.png

Tim

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bitrex Contact options for registered users 's Avatar (by Gravatar) posted on
December 12, 2014, 9:48 pm
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Re: Allied tube power transformer
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Nice use of the "Forrest Mims" oscillator topology!

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Tim Williams Contact options for registered users 's Avatar (by Gravatar) posted on
December 12, 2014, 9:58 pm
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Re: Allied tube power transformer
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Hmm, hadn't thought of that.  I pieced that together from scratch, but I  
suppose some of the feedback bits are reminiscient.  It's not really a  
multivibrator though, more like a monostable with a variably leaky  
re-trigger.

Predecessors used feedback from the output transistor (gate or drain), but  
as this varies with supply and load voltage, I try to avoid doing that.  
Still, comparable performance and behavior (current mode control, no  
feedback winding required) from four transistors wasn't too bad either.

Tim

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