IIRC, Eimac never made Graphite 3-500's,
if I am wrong, someone will correct me.
The Graphite Anode, being of larger mass,
and who knows what's in them, may need
those precautions.
Saying that, I converted an old SB-220 to
6 Meters and never followed those precautions,
even though both tubes had Graphite Anodes.
But then, they were older tubes, years older.
With today's tubes ....
73, Dick, W1KSZ
On Mon, Jun 5, 2017 at 8:21 AM, Clark Turner <Clark@clarkturnertuning.com>
wrote:
> RF parts supposedly told a local ham that 3-500Z RF parts tubes need a
> minimum of 30 Full minutes of cool down with the blower on and that they
> also need to warm up. He insisted they told him this information and said
> that if you do not warm up for 5 to 10 min and cool down for 30, the
> graphite will crack.
>
> 3-500z is an instant on tube and one of its largest advantages. I have
> turned my SB220 on, Made contacts and shut it off for 20 years with Eimac
> tubes.
>
> Do you agree with this information?
>
> C
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>
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