[LargeFormat] James Millen flash

[Ken Strauss]

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=20
couple of sites about James Millen, the James Millen Mfg Co. and the=20
James Millen Society.   Their expert thinks that it's not so much of a=20
James Millen flash, but that they probably made the flash tube lock=20
assembly for someone else.

A post at the Graflex.org site came up with someone else who has a=20
Heiland Research flash identical to this, so there's a clue.

On the electronic side, one person suggested that a modern tube of the=20
same length would have the same specs as this one. I have to wonder if=20
tube diameter might be a factor as well because, compared to my 400ws=20
Norman, and worse, my 1200ws WL Ultra, this is a Very long tube.  The=20
mystery vacuum tube at the bottom end has been identified as an OA5=20
thyrotron. So now I have to look that one up in the tube directory. I=20
remember articles written about flash units, usually studio flash,=20
using "thyrotron circuitry" could be harmful to flash contacts as they=20
pushed a lot of current through the tripping circuit.  Does anybody=20
else remember such stuff?


Les Newcomer


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