>I have a old 304TL made by Sylvania.
>I try to put this tube in circiut with plate voltage 2500volt.
>As a book say for AB1 Grid voltage should be -230 volt.
>I was made adjustbale regulated power supplay use two VR150 for DC Grid
>Voltage.
>I was start to adjust Grid V from -300volt, when DC Grid Volt near to -230,
>the tube start to arcing.
>I was suspect that this tube was "gassy", and I let filamen turning on until
>two days (48 hours).
>And I start adjust DC grid volt near to -230V again, then problem was the
>same, tube start to arcing again.
I have had similar experiences with gassy tubes. They never seem to
getter themselves -- i. e., Get rid of internal gas.
cheers, Firson.
>What the true problem is this, is this tube gassy, and is there any way to
>make them work.
>
>Thanks for comments
>
>Firson - YD0LZH
>
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>
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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