>At 03:48 PM 3/17/03 -0600, Phil Clements wrote:
>>One of the main issues is inrush current, Steve.
>>This is the reason most light bulbs fail upon turn-on.
>>If the filament transformer is designed properly for the tube(s)being
powered,
>>the inrush current is self-limiting to less than the tube manufacturer's
>>specs.,
>>and you have built-in protection and long tube life.
>
>
>I believe many old 3-500Zs are in SB-220s, which are designed to this
>standard. No?
The SB-220 uses a current-limiting type fil xfmr that limits inrush
current to 60% of what is allowed in the 3-500Z's technical
specifications.
>
>
>73, Pete N4ZR
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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