Re: [Amps] 3-500Z cool down time

[Clark Turner <Clark@ClarkTurnerTuning.com>]

I agree. I wondered if these newer made RF parts tubes are in fact not 
instant on and require warm up and cool down.
C


On 6/5/2017 10:28 AM, Joe wrote:
> Plus in my amp if I ever got the plates hot enough to glow red or orange.
> I'd say once RF is removed I bet it's less than a second that it's no 
> longer colored, and not long after that what ever temp it is because 
> of he filament. I'd say less than 5 seconds if that long!
> Joe WB9SBD
> Sig
> The Original Rolling Ball Clock
> Idle Tyme
> Idle-Tyme.com
> http://www.idle-tyme.com
> On 6/5/2017 12:24 PM, Gary Schafer wrote:
> > Well, the plate is in a vacuum so no heat is conducted to the glass envelope
> > except for the small plate lead pin. All the air in the world isn't going to
> > cool the plate down.
> >
> > Forced air on the tube is to keep the seal temperature down.
> > All of the cooling of the plate is accomplished by radiation.
> >
> > I believe that it would take a long time to heat up the plate with just the
> > filament on.
> >
> > 73
> > Gary  K4FMX
> >
> > > -----Original Message-----
> > > From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Clark
> > > Turner
> > > Sent: Monday, June 05, 2017 10:21 AM
> > > To:amps@contesting.com
> > > Subject: [Amps] 3-500Z cool down time
> > >
> > > 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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