Electrostatic Speakers/SS amp - what tube preamp?

Unsound, I'm realy curious about 50Ohms...
If that is the case or near arround even SF can be an issue of compatibility. I might be wrong if SF is transformer-coupled like AN...?

Marakanetz, Why to you feel a 500 ohm out put pre would present a load problem for a 50K ohm input? This is a 100 to 1 ratio. As i recall the minimum is 10 to 1. I would expect that the best thing a user could do would be to ask the manufacturer of the pre amp (if it is not specified in the user manual, as mine was).

Nothing wrong with 50K, I was just wondering about 50Ohms as Unsound stated...???

Marakantetz, good catch. Thanks for keeping everything straight. It should have read as 50K Ohms. Sorry for the typo.