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Those residential, single-phase pad-mount transformers have very low impedance (internal resistance). That means higher available short-circuit current and ultimately better voltage regulation.
We had the same issues when using just a vacuum cleaner show up on the 1972 Sony KV1210.
There was a Truman-Era transformer with brown porcelains and wires, not terminals (7 kVA and rated for only 29 amps) on the road pole and 100 feet of #4 aluminum overhead wire to a small-round meter base. When you add up all that series resistance and multiply it by even 20 amps, the voltage drop is enough to be VERY noticeable on anything old that lights up
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