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In the absence of a width sleeve or an operative width control, there's a coupla ways to reduce width.
1. increase the value of the resistor feeding the screen grid (G2) of the H output tube. This reduces the voltage on G2.
First try about a 5% increase in value of the resistor, and go from there.
2. Add resistance in the cathode leg of the H output tube. Try 50 ohms as a starting point.
The caveat to these methods is that HV is reduced proportionately with the width.
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