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Baird CRT projectors 1939 - neat!

 
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G
Posted: Tue Dec 02, 2014 4:51 pm    Post subject: Baird CRT projectors 1939 - neat!
http://www.earlytelevision.org/baird_theater_tv.html
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CRT.

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HK-Steve



Joined: 15 Jul 2006
Posts: 849
Location: Switzerland

TV/Projector: Marquee 9500, Epson 8100
Posted: Tue Dec 02, 2014 5:08 pm    Post subject:
Wow, very cool find.
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Tim in Phoenix



Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix

Posted: Tue Dec 02, 2014 6:06 pm    Post subject:
Dang

You have to respect a machine that runs 60kv from a fortified bunker!
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garyfritz



Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO

Posted: Tue Dec 02, 2014 7:41 pm    Post subject:
I wondered why it had 2 tubes. The article says it's a failover! They must have had pretty bad reliability if they needed a hot-spare to swap in when the first one died...
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ecrabb
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Joined: 13 Mar 2006
Posts: 15909
Location: Utah

TV/Projector: JVC RS40, Epson 5010
Posted: Tue Dec 02, 2014 8:00 pm    Post subject:
garyfritz wrote:
I wondered why it had 2 tubes. The article says it's a failover! They must have had pretty bad reliability if they needed a hot-spare to swap in when the first one died...


Up to 60kV driving a single tube making a 4x5-inch image, projecting on a 15x20-foot screen - in 1939 when most CRTs were making like a 12- or 13-inch diagonal image... I'd say the thing was running on the ragged edge.

Says it drew 2kW at 200-250v... So, about half a clothes dryer. Wink

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CasetheCorvetteman



Joined: 09 Nov 2008
Posts: 6326
Location: Australia

Posted: Tue Dec 02, 2014 11:50 pm    Post subject:
You have a 4kW clothes dryer??? Must be very very big!
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RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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the big E



Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.

Posted: Mon Dec 08, 2014 5:31 am    Post subject:
Tim in Phoenix wrote:
Dang

You have to respect a machine that runs 60kv from a fortified bunker!


Agreed
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