Seems to me the fault current would be determined by the capacitor
bank value, not the transformer and rectifier configuration. I use a
voltage doubler circuit in one of my homebrew amps, and it supplies
4000V at 1 amp. Another amplifier uses a full wave bridge circuit and
provides the same voltage and current. The transformers in the two
power supplies weigh the same (67lbs). The voltage doubler supply uses
two 100 µF/2500V oil capacitors in series. The full wave bridge supply
uses a single 50µF/5000V oil capacitor.
73,
Jim w8zr
Sent from my iPhone
> On May 13, 2017, at 5:10 PM, Richard Solomon <dickw1ksz@gmail.com> wrote:
>
> Actually, the Yankee Skinflint in me likes
> to think it had more to do with economics.
>
> Copper wire and winding time is expensive.
>
> 73, Dick, W1KSZ
>
>> On Sat, May 13, 2017 at 2:00 PM, Ron Youvan <ka4inm@gmail.com> wrote:
>>
>> Paul Baldock wrote:
>>
>> Why did early amplifiers use voltage doublers rather than twice the
>>> secondary turns and a full wave bridge?
>>>
>>
>> I think it is for two reasons, to control the impedance of the power
>> supply and to limit the fault current, if there is an arc. (anywhere)
>> Then on rebuilds cheapskate HAMs double the value of the capacitors and
>> increase the fault current.
>>
>> Making the plate supply overly robust (and low impedance) increases the
>> chances of a fault damaging things, if the supply caves in, hard damage is
>> minimized.
>> The SB-220 plate power supply was the perfect design for two 3-500s
>> throttled back to 1,000 input watts. (then the limit)
>> --
>> Ron KA4INM - Youvan's corollary:
>> Every action results in unwanted side effects.
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>>
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