[Amps] 3-500Z cool down time

[Richard Solomon]

IIRC, so did Amperex.

I think one issue today is that the
Graphite of today may be not the
Graphite of yore.

73, Dick, W1KSZ

73, Dick, W1KSZ

On Mon, Jun 5, 2017 at 2:34 PM, kris Cobb <blaqyukon at gmail.com> wrote:

> Eimac did not, Taylor did, rf parts sells them.
>
>
>
> Kris KD2MYZ
>
> Sent from my iPhone
>
> > On Jun 5, 2017, at 11:35 AM, Richard Solomon <dickw1ksz at gmail.com>
> wrote:
> >
> > 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 at 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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