the 20 Hy/100 mA 193C might be an option for builders using a shunt regulated PS. It is a nice looking item, and its critical current is well within those required with VR tube designs.Actually, according to the PSUD sims I just ran, critical current seems to be a bit over 12 mA for a 250V input, so this may be a better place to start than the 157G.
Note as input voltage goes up, so does critical current.
regards,
Douglas