[morzh]

So Mike that 25W resistor still gets pretty hot. Probably about as hot as the 117Z6. 5.5wts would burst into flames!!!

Terry

I am sure it does. The dissipation rating does not mean if it is rated for what it is dissipating it won't become hot.
Myself I am usually comfortable with factor of 3 if it is constant and factor of 2 if it is intermittent and lasts under a minute or so. Obviously if you have money and space, the bigger the better.