>
>> Not that I've noticed, also not when at 400 W RTTY or SSTV.. The tubes are
>> new EIMACs, according to the previous owner.
>
>> On this point, I've always been under the impression that for this box,
>> the SB 220, red anodes are only visible at just about "full smoke" and key
>> down for quite a while, is this not correct?
>
>It's been years since I've seen an SB-220, but as I recall the tubes
>will show a slight color at the bottom of the anode when keyed
>without drive in the CW HV position, and more color in the SSB
>position.
This is what my SB-220 does, Tom. .
>
>If not, and if I was using the tubes, I'd reset the bias until I did see
>a tinge of red color in some area of the anode or at least
>periodically intentionally redden the tube anodes to make sure the
>tubes are gettered.
>
With graphite anodes, when the gets really hot, the graphite releases
trapped gasses.
>
later, Tom.
>
>--
>FAQ on WWW: http://www.contesting.com/ampsfaq.html
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>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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