[Radio Wrangler]

That 1000mA anode current figure is just a peak rating. It means that you can run them at any current up to that and the power ratings for anode dissipation and G2 dissipation will tell you that you can't have it handling this sort of current for much of the time. Running these valves with enough negative bias on G1, or a suitable value of cathode resistor will let you set any lower current you want.

Such valves, though, when run up to their power capabilities in an audio amp, and especially when run as pairs makes me expect that the turns ratio of the output transformer will be unusually low which will be a limitation if used with more usual audio output valves.

Similarly, the anode voltage ratings will be a lot higher than the HT these valves would be used with. It'll be a pulse rating for use in TV line output stages.

David