[Amps] power supply transformer

[Patrick A. Thompson Sr.]

This is related but not quite on topic.

What are the transformer design differences between, for instance, a 
transformer designed to convert 480vac to 120vac and is labeled a 
control transformer, to a plate transformer designed to convert 120vac 
to 480vac and used with rectifiers to provide plate voltage to an amplifier?

I have often thought that using a control transformer in this reverse 
manner would be reasonable. That is, 120vac in to 480vac out for use as 
a plate transformer.

Or better, a pair of say 500va control transformers used to give 960vac 
out and with a voltage doubler giving near 2600vdc with 1000va available.

What am I missing? Insulation? The only thing that comes to mind is 
perhaps the control transformer has increased internal resistance 
compared to normal plate transformers. In this case, is reducing the 
expected current draw enough to compensate?

Dollarwise, the only reason to consider using control transformers as 
plate transformers is their availability on the surplus market.

I would not ask if I already knew the answers!

Pat
wa4tuk



Dennis OConnor wrote:
> Paul, you have to have a line transformer for isolation - it is life and death - no discussion possible...
>    
>   Secondly, (as an old Plant Engineer) have you priced the Square D transformer... You are likely in for a surprise... Industrial equipment is not value priced, it is priced to meet industrial specs and immediate availability - as machine downtime costs big dollars..
>   I would think that Peter Dahl, or others, will be more likely to wind you a transformer to meet your needs than industrial stuff that isn't quite right for the kind of surge currents you will see...
>    
>   denny / k8do
> 
>  
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