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It sounds to me like he just put the 5k pot in series with the H tap and the 1k resistor going to the crt. That is the wrong place, as it needs to be set up as a voltage divider between the H and L taps with the center leg of the pot going to the 1k resistor, as explained by Andy. I share the concern about upsetting the bias on the transistor and would also recommend placing a 22k fixed resistor across the pot.
jr
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