[Amps] Jennings Vacuum Variables

[Charles Bibb]

Can someone direct me to a website or other resource for data on 
older Jennings vacuum variable capacitors?

The info I'm looking for would give the min. and max. capacitance 
value and the voltage rating from the model number. Some model
numbers obviously contain this information, others do not.

I've been to the Jennings website, but it only lists current production.

Any help would be appreciated.

73,
Charles - K5ZK