[Amps] Why a voltage doubler ?

[Carl]

The doubler had been used by hams since the 30's but made it into prime time 
with QST articles aimed at the Novice and other money challenged hams.

National and Collins were early users and within a few years almost everyone 
was doing it.

Ameritron still lives in the last century.

Carl


----- Original Message ----- 
From: "Richard Solomon" <dickw1ksz at gmail.com>
To: "amps" <amps at contesting.com>
Sent: Saturday, May 13, 2017 5:09 PM
Subject: Re: [Amps] Why a voltage doubler ?


> 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 at 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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