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  #91  
Old 02-12-2013, 05:21 PM
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The FD-20 doesn't look too bad - I had a lot worse on the 1 I gave away, severe pincushion and trapezoid deformation. The FD-210 looks very good.
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  #92  
Old 02-13-2013, 07:56 AM
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Quote:
Originally Posted by crtfool View Post
The FD-20 doesn't look too bad - I had a lot worse on the 1 I gave away, severe pincushion and trapezoid deformation. The FD-210 looks very good.
There are geometry adjustment pots on the FD-20 that correct for trapezoidal raster. I have noticed the screen geometry varies between examples of this set. The FD-20 does seem to be one of the better models, built before they started cheapening things with the FD-10 which had no picture controls and could not even use an AC adaptor.

The FD-230 is a good set, solidly built and with a 2.7 inch screen.
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  #93  
Old 02-13-2013, 12:43 PM
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does anyone know if the plastic front cover can be removed for dust cleaning on the sony fd-10. i know the fd-20 has 2 screws to remove the front for cleaning. i dont want to pry on the fd-10 and break the front.
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  #94  
Old 02-13-2013, 05:07 PM
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does anyone know if the plastic front cover can be removed for dust cleaning on the sony fd-10. i know the fd-20 has 2 screws to remove the front for cleaning. i dont want to pry on the fd-10 and break the front.
I tried on a "parts set" that I have, using several different plastic pry tools, and could not budge it without messing up the plastic around the screen cover. It appears to be solidly glued in place. I think that you have to go in from the back, which is not an easy task!

jr
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  #95  
Old 02-14-2013, 06:40 AM
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well its not that bad with dust or dead bugs so ill leave it, thanks.
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  #96  
Old 02-14-2013, 12:29 PM
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You might be able to blow it out with compressed air.
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  #97  
Old 02-14-2013, 12:55 PM
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i noticed that on the fd-10 when the back is taken off extreme care must be applied in putting the back, back on because the micro switch for uhf-vhf broke when i put the back on as i didnt line up the position of the swich relative to where the slider is on the cover. the micro switch has a very thin plastic tab and will break if you look at it the wrong way,lol as mine broke. so i put a little crazy glue to keep the switch in the vhf position.
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  #98  
Old 02-15-2013, 07:32 AM
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Quote:
Originally Posted by timmy View Post
i noticed that on the fd-10 when the back is taken off extreme care must be applied in putting the back, back on because the micro switch for uhf-vhf broke when i put the back on as i didnt line up the position of the swich relative to where the slider is on the cover. the micro switch has a very thin plastic tab and will break if you look at it the wrong way,lol as mine broke. so i put a little crazy glue to keep the switch in the vhf position.
Also I have noticed on the FD-10 and FD-2A that the cabinet plastic is relatively soft and the screws that go direct.y into the plastic can strip out easily. This does not seem to be a problem with the models that came before and after.
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  #99  
Old 02-15-2013, 07:57 AM
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yes i found that the plastic is infact soft. well the cheapest way to make them, they did.
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  #100  
Old 07-14-2016, 06:27 PM
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But how in the world they made the deflection when the gun was underneath?
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  #101  
Old 07-15-2016, 01:44 PM
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But how in the world they made the deflection when the gun was underneath?
Electron beams can be deflected at 90 degrees or more. It is possible even to make a mirror which can reverse the travel of the beam completely. However, as the beam is deflected more the beam can be de-focused and geometry can suffer. The Sony tvs had considerable keystone correction, and yet the geometry was not very good on these tiny sets.

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  #102  
Old 07-15-2016, 07:11 PM
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Quote:
Originally Posted by Telecolor 3007 View Post
But how in the world they made the deflection when the gun was underneath?
The screen is the back piece of glass. You look through one sheet of glass, through the vacuum then at the screen on the inside of the back wall of the CRT the screen curves gently out toward the viewer at the top. From the electron gun's perspective it it shooting at a very short wide screen....No crazy deflection angles here.

If you had asked a few months back I'd have given you a working Sony paddle CRT set for the cost of shipping.
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  #103  
Old 07-15-2016, 07:48 PM
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Originally Posted by Electronic M View Post
The screen is the back piece of glass. You look through one sheet of glass, through the vacuum then at the screen on the inside of the back wall of the CRT the screen curves gently out toward the viewer at the top. From the electron gun's perspective it it shooting at a very short wide screen....No crazy deflection angles here.
That is indeed true for the second generation design, the curved phosphor screen allowed the electron beam to land with only modest vertical deflection required. Magnetic deflection was employed for both axes.
The first generation design employed a flat phosphor screen at 90 degrees to the electron gun. A combination of magnetic and electrostatic deflection was used to achieve proper landing of the beam.

http://www.videokarma.org/attachment...5&d=1256418738

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  #104  
Old 01-28-2017, 09:06 AM
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Were any of these micro sets made with electrostatic crts ?
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  #105  
Old 01-28-2017, 12:13 PM
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Were any of these micro sets made with electrostatic crts ?
Here is a picture from post #3 of this thread, showing the electrostatic crt that was used in a Sinclair portable:

http://www.videokarma.org/attachment...7&d=1256418738

post #3 : http://www.videokarma.org/showpost.p...14&postcount=3

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