What would you like to know ? While not an expert on the unit, I own a half dozen of these units in various forms. I also have quite a bit of the factory literature and have spoken to the designer / builder on several occasions. My Brother also runs a 511A in his main system and so does my Father.
Part of the reason that you don't see a lot of these units for sale is that quite a few people don't want to part with them. Even if they are not using them anymore, they know that you can't really replace them without spending quite a bit of money. If they did some mods to them, they would still be using them as their main preamps. Kind of amazing that a piece of SS gear that was designed in 1974 can still hold it's own, isn't it ??? Sean
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Part of the reason that you don't see a lot of these units for sale is that quite a few people don't want to part with them. Even if they are not using them anymore, they know that you can't really replace them without spending quite a bit of money. If they did some mods to them, they would still be using them as their main preamps. Kind of amazing that a piece of SS gear that was designed in 1974 can still hold it's own, isn't it ??? Sean
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