[R-390] Cooking Kielbasa 2 of 2

[rbethman]

Roger,

Not all Kielbasa is the same!  The recipes in Poland are a regional "thing".

I've used a resistor in lieu of the 3TF7, but I didn't want to wrap it 
in anything.  I wanted it to have a free flowing convection cooling.  I 
feel that potting it may just over do it.

However, I've made use of a source I located for the 3TF7s.  The 
resistor is on hold.

Bob - N0DGN

On 4/2/2010 4:33 PM, Flowertime01 at wmconnect.com wrote:
> Fellows,
>
> I used a 50 ohm 10 watt resistor for the RT512 3TF7 ballast tube in the
> R390. I measured a 13.6 voltage drop across the ballast and the resistor. 13.6
> volts at .3 amps is 4.08 watts of heat from the resistor. I measured 12.6
> volts across the two 5749's in series with the ballast tube and the 50 ohm
> resistor. I though the 50 ohms would be high expecting 12.6 volts at .3 amps to
> yield 42 ohms. I found no measurable difference in receiver performance
> with either device in the VFO BFO circuits.
>
> I had potted the resistor in epoxy and PVC to make a mechanical fit of the
> resistor into the tube socket. I find the 4.08 watts a bit warm but not more
> so than the glass ballast tube. 4 watts of hot glass is just not the same
> as 4 watts of hot plastic. I can except finger burning glass tubes but not
> finger burning plastic. The replacement device works as expected, It just does
> not feel right.
>
> Roger AI4NI