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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