[Amps] Can I cool too much the tubes?

[Patrick Barthelow]

Does anyone have a schematic for the amp under discussion, or perhaps looked to see the sensor device that senses excessive heat to 
trigger a shutdown?  I am curious what they sample for the  heat trip function.    And, if it is an internal sensor for the transformer core, it might not help,  but perhaps some extra muffin fans, mounted external or internal to the amp could add enough cooling to extend its duty cycle on RTTY.

Back in the olden days, as a kid, I used to sit a muffin fan right on top of my Drake TR-4 Finals Cage, drawing upward, and the whole radio became and ran dramatically cooler.
 
Best Regards,   
73, de Pat Barthelow AA6EG  
 
 
> Date: Thu, 19 Aug 2010 20:16:13 -0700
> From: r_bakalov at yahoo.com
> To: amps at contesting.com; ranchorobbo at gmail.com
> Subject: Re: [Amps] Can I cool too much the tubes?
> 
> Rob,
> I am the second owner of this amp and don't know its age. It is the grey model. I can certainly look up the serial number when I am back to VE3 where my contesting QTH is.
> As far as mode goes, my very first post noted that this is with respect to RTTY where I can't really run it longer than 30 min at full power.  I am not a SSB guy; CW runs all day long at full power. Standby or not, some sort of protection kicks in when the amps gets too hot and the orange STBY LED is on.
> So now my dilemma is if I should run low power, without the amp, or high power at only 400 W during the upcoming CQWW RTTY contest :-) Or time for an Alpha :-)
> Rudy N2WQ
> --- On Thu, 8/19/10, Rob Atkinson <ranchorobbo at gmail.com> wrote:
> 
> From: Rob Atkinson <ranchorobbo at gmail.com>
> Subject: Re: [Amps] Can I cool too much the tubes?
> To: amps at contesting.com
> Date: Thursday, August 19, 2010, 4:28 PM
> 
> Rudy,
> 
> Is this automatic standby mode protection a new thing with the
> Centurion?  Mine is around 10 years old and it has nothing like this.
> 
> When did you get yours?
> 
> N.B.  When you guys write about transmittion time at some power level,
> it is very important that you specify the mode.
> 
> There is a huge difference between "1.5 KW no time limit (operating
> SSB) and 1.5 KW no time limit carrier.
> 
> SSB is the "Coors Light" of transmission modes.
> 
> 73
> 
> Rob
> K5UJ
> 
> 
> On Wed, 18 Aug 2010 10:34:58 -0700 (PDT), Rudy Bakalov
> <r_bakalov at yahoo.com> wrote:
> 
> >Experience trumps specs. The amp goes into standby mode after about 30 minutes
> >running at full power, i.e. about 1200 W.  If I run it at around 400-500 W it
> >is fine.
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