[R-390] More Ballast Tube Noise

[Roy Morgan]

At 03:41 PM 2/8/2005, you wrote:
>Does anyone have information on what the difference is between a...
>
>3TF7 and the,
>
>3TF4 & 3TFV4

That last one I don't know about but, the first number is the regulating 
current in tenths of an amp, the last number is the knee of the regulating 
voltage across the ballast.

So: 3TF7 300 ma current, regulates at 7 volts and upwards
       3TF4: 300 ma current regulates at 4 volts and upwards.

If I had two 3TF4's, I'd put them in series to see what happens.

Roy


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