My 11 year old son's Admiral 30A1 restoration project

[old_coot88]

I would go with the value that was used `as found` and disregard the unused taps.

[N2IXK]

I would look for an adjustable wirewound resistor of ~6300 ohms, as those are different taps for width adjustment. Then you can set the tap as needed.

[UberVacTuber]

That same resistor died in my 30A1 as well. While I would get a picture, it was very wide, and the width control had no effect. I bought a replacement that was equal to the original tap (I had to buy 2 and put them in series as I couldn't get the exact value I needed in one). Once replaced, the raster was a much better size and shape, plus the width control worked again.

Look closely at the dimensions when ordering a new one. In my case the disclaimer "The actual part may differ from the picture" bit me. I thought I'd be able to simply stack the resistors on top of each oth on the original mounting screw, but both units were tall, too tall to do this with. I had to fabricate a holder to mount them both side-by-side in the cage. D'oh!