[R-390] Ballast Tubes

[Bob Camp]

Hi

If you have a single radio, or can re-wire all your radios to match 
this works pretty darn well. The problem comes in when you have 
multiple radios with multiple mods on them. Getting one set of ballast 
tube mods mixed up with another set can result in unpredictable results 
...

	Take Care!

		Bob Camp
		KB8TQ



On Jul 4, 2004, at 10:47 AM, ToddRoberts2001 at aol.com wrote:

> I think this has been said in the past. It is a bit more work in the
> beginning but I have had very good results by re-wiring the filament 
> line in the I.F.
> deck to run the BFO and PTO tubes in parallel with the 6.3VAC filament 
> line.
> This does away with using a resistor and saves the heat being 
> dissipated. If
> you want to keep the original look of the radio just plug in a dead 
> 3TF7 in the
> socket and leave it there. No one will know the difference unless they 
> touch
> the tube and find it is cold. All I know is one time I used a variac 
> and varied
> the 115 VAC line voltage +/- 10 volts with and without the ballast 
> tube -
> with the BFO turned on - I couldn't hear any change in the beat note 
> with the
> receiver tuned to an AM BC station. 73 Todd Roberts WD4NGG.
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