[Amps] 3-500Z cool down time

[Joe]

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 at contesting.com] On Behalf Of Clark
>> Turner
>> Sent: Monday, June 05, 2017 10:21 AM
>> To: amps at 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
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
>