[Amps] 3-500Z cool down time

[Clark Turner]

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
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> 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
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>>
>