In principle basic same reverb springs are offered in two dozen different mounting and wiring configurations: open side up/down/to one side, and connectors grounded/floating/insulated/etc. plus all their permutations and combinations.
That said, one basic spring design will be as hummy/buzzy/boingy/microphonic as its exact electromechanical twin, even if made in a geographically different factory or in a different year, since all share the same basic blueprint and working principle.
Meaning: you won´t go from rusted iron to gold by replacing a 1979 spring with basically same, just made in 2018 .
The only difference a Twin Reverb reverb is not annoying while your is, is not "tank quality" but Twin one is driven balls to the wall with a properly impedance matched 2W RMS tube amp so *output* signal is huge, overpowering interference, and to boot is mounted inside a floating insulated bag at the cabinet bottom and some 24 inches or more away from the power transformer, while yours is bolted to chassis inside a shoebox and to boot is barely driven, if at all , but a cheesy flea power Op Amp, maybe getting 25 milliWatts of power.
Of course inaudible output signal can be brought up by a sensitive preamp. ..... together with any and all interference floating around.
Unless you improve that ... no tank change will solve your problem.
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