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The 33 ohm cathode resistor reduces the gain such that the max possible plate swing is 136 volts. Knock off a bit for the plate resistance, and it's maybe 128 volts.
BUT all this was quick small-signal analysis based on spec sheet data at a plate voltage of 250 volts. You are right - The B+ of 130 v in this set means that the analysis should be done graphically and the gain will be considerably less. I'll attempt this later for fun, but it may be that the answer is 30 or even 16!
That's what I get for going back-of-the-envelope as I'm falling asleep.
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