Oldest operational computer was Re: cctalk Digest, Vol 54, Issue

dwight elvey dkelvey at hotmail.com
Thu Feb 14 22:22:26 CST 2008



Hi
 I wish to make a correction. The tubes were called audions and were
not made until 1906. Low gain made them hard to use for radio uses
but that has nothing to do with digital uses.
Dwight



> From: dkelvey at hotmail.com
> To: cctalk at classiccmp.org
> Date: Thu, 14 Feb 2008 20:08:46 -0800
> Subject: RE: Oldest operational computer was Re: cctalk Digest, Vol 54, Issue
>
>
>
>
>
>> From: wdonzelli at gmail.com
>>
> ---snip--
>>
>> I am sitting here, reading this thread, and am astounded by what
>> people think tubes could do back in 1906. It would have been
>> *impossible* to make any sort of computing device using the technology
>> of the time. You would have better luck porting OS/2 to a 709.
>>
>> Tubes back then barely worked. When they did work, they barely
>> amplified. And you were lucky to get 50 hours out of them. A try
>> getting two that were vaguely similar electrically. And then try to
>> find someone that actually knew how the things worked.
>>
>>
> Hi
> Where did you get this infomation?
> Audiotrons were used for telephone amplification and generally ran
> for a thousand hours or more. Many collectors have these tubes that are
> still operational today.
> Gain was low but for digital that is desired. A gain of three or four
> in power is more than is required for digital computers. More than
> that would be a waste.
> Although, I don't have any audiotrons myself, I do have tubes
> made in the 20's that are still working at close to new specs.
> I do agree that the large number of tubes required would be difficult
> to remain operational but requirements for a digital computer are
> not that great compared to other applications.
> Dwight
>
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