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Old 14th January 2018, 09:34 AM   #8191
Manta79 is offline Manta79  Netherlands
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Quote:
Originally Posted by hpeter View Post
..but barreters are gas filled with iron filament ?
Did it light up like nixies or neon ?
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Old 14th January 2018, 09:42 AM   #8192
Manta79 is offline Manta79  Netherlands
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One of the reasons I am interested is that I have an old Philips cinema tube amplifier, 1945+, that I would like to restore in its old glory. There is also a light bulb on it. What does a ballast do ?

Best, Richard

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Old Yesterday, 06:07 AM   #8193
Wavebourn is offline Wavebourn  United States
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Originally Posted by Manta79 View Post
What does a ballast do ?
Kind of CCS. Resistance of the filament depends on it's temperature, so the higher is the voltage drop, the higher is the resistance.
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Old Yesterday, 07:25 AM   #8194
El Sid is online now El Sid  South Africa
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Originally Posted by euromut View Post
My self restored HH Scott LK-72

Click the image to open in full size.
Wow that is very very nice!
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