[LargeFormat] James Millen flash

[LNphoto]

Whoa ! great stuff!! and from the URL I get the idea these came out in 
1949 or is that just a file number?  The paper certainly looks the part.

Les

On Monday, December 8, 2003, at 10:42  AM, Ken Strauss wrote:

> There is a data sheet and schematic for typical usage of the 0A5 at
> http://208.190.133.201/tubes/oldsyl/data/1949/0A5_1.gif and
> http://208.190.133.201/tubes/oldsyl/data/1949/0A5_2.gif
>
>
> -----Original Message-----
> From: largeformat-admin@f32.net [mailto:largeformat-admin@f32.net] On 
> Behalf
> Of LNphoto
> Sent: December 7, 2003 19:24
> To: largeformat@f32.net
> Subject: Re: [LargeFormat] James Millen flash
>
>
> On Saturday, December 6, 2003, at 04:38  PM, Richard Knoppow wrote:
>
>>
>>>
>>   James Millan was an employee of the National Radio
>> Company, another name from the distant past, but well known
>> to radio amateurs. At some time in the early 1930's he left
>> and started his own company making electronic components.
>> Millan parts were very well known in amateur radio circles.
>>   I have no idea what happened to the company or how
>> recently it existed. I don't know anything about the flash
>> unit.
>>
>> ---
>> Richard Knoppow
>> Los Angeles, CA, USA
>> dickburk@ix.netcom.com
>>
>
> richard,
> thanks for the lead.  I did some surfing until the wee hours, found a
> couple of sites about James Millen, the James Millen Mfg Co. and the
> James Millen Society.   Their expert thinks that it's not so much of a
> James Millen flash, but that they probably made the flash tube lock
> assembly for someone else.
>
> A post at the Graflex.org site came up with someone else who has a
> Heiland Research flash identical to this, so there's a clue.
>
> On the electronic side, one person suggested that a modern tube of the
> same length would have the same specs as this one. I have to wonder if
> tube diameter might be a factor as well because, compared to my 400ws
> Norman, and worse, my 1200ws WL Ultra, this is a Very long tube.  The
> mystery vacuum tube at the bottom end has been identified as an OA5
> thyrotron. So now I have to look that one up in the tube directory. I
> remember articles written about flash units, usually studio flash,
> using "thyrotron circuitry" could be harmful to flash contacts as they
> pushed a lot of current through the tripping circuit.  Does anybody
> else remember such stuff?
>
>
> Les Newcomer
>
>
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