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variac question

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03-19-2008, 06:28 PM

yagosaga

VK Member

Join Date: Jan 2005

Location: in Braunschweig

Posts: 690

I operate every vintage hybrid tv set with a variac. Here in Europe, vintage tv sets do not have a mains transformer. Filaments are heated by serial mains voltage. And when they are cold, they are overheated by the full mains A.C.. This reduces the lifetime of the tubes. So I use a variac and watch the tubes' heating while power on.

- Eckhard

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