Mal,

    You couldn't be more wrong!!!
I have been running a Decca in QRSS 60 for several years now at full
power + often overnight and occasionally for days at time with ZERO
transmitter failures. The Decca runs cool at 1.4 - 1.5 kW DC input.
Perhaps you are not allowing for sufficient air circulation through
the heat sinks. My Decca is in a rack with plenty of clearance above
and below for the air to circulate. I don't think that it's a good
idea to run the Decca sitting on a table as I've seen done in some
shack pictures.

-- 
73 Warren K2ORS
                WD2XGJ
                WD2XSH/23
                WE2XEB/2
                WE2XGR/1

On Wed, May 6, 2009 at 11:59 AM, mal hamilton <[email protected]> wrote:
> The old decca Jeep 5501 cannot strand LMCW 120, 240 or dfcw for long, 3 or
> 10 sec dot or normal cw is about their limit on full power.
> I have 2 units (6 modules) but prefer my home brew with robust FETS on 137
> Khz.
> I likewise have a h/brew fet pa for 500 Khz class E and it is virtually
> indestructable when correctly adjusted using a scope.
>
> G3KEV