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What kind of video tube do i need

 
Black & White Television plus Standards converters
Last Post by Marconi_MPT4 4 years ago
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 acj1980
(@acj1980)
Posts: 224
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Topic starter
 

Hi folks.

i havethis projectto build a AV monitor and are done with the schematic, it´s from an existing television, for video they use the PCL84, i just want to use the penthode, so my question is, is there another tube i can use instead of pcl84 with nearly the same data, i like the 12by7a but i´m not sure it can fit in the circuit.

sincerely

Alex

 
Posted : 08/02/2021 1:29 pm
 Boater Sam
(@boater-sam)
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PFL200 would be the latest valve used for vision output.

 
Posted : 08/02/2021 6:54 pm
acj1980, acj1980 and acj1980 reacted
 Till Eulenspiegel
(@till)
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The PFL200 was introduced in 1963/4.   The Baird 680 monochrome cable TV employed a PL802 for the video output. Possibly the only mono set to do so.

Till Eulenspiegel

 
Posted : 08/02/2021 7:02 pm
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 acj1980
(@acj1980)
Posts: 224
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thanx for answering, but im only interested in a video penthode like pl83, but i dont think it can be driven at 18 mA on the anode

 
Posted : 08/02/2021 7:13 pm
 Marconi_MPT4
(@marconi_mpt4)
Posts: 374
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PL83 was a reasonable video pentode in its day and has a 15V 300mA heater. It has an anode operating current of 36mA and I believe it was used by Philips in their projection TV sets. It is possible to operate at a lower anode current, probably by adjusting the screen voltage and changing grid bias to suit.

12HG7A was used by B&O in their 3400 chassis and 12GN7A in 3200 series.

Rich

 
Posted : 08/02/2021 7:18 pm
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