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Where is Singlepower? Where is Mikhail? - Page 56

post #826 of 1953
Quote:
Originally Posted by 4N6 View Post
It's also not a "hydrostatic" amp!
Woops. They are harder to build.

Why are electrostatic headphones so hard to drive well, as I guess they must be? Or is that they are also very sensitive and even small amounts of distortion are easy to hear?

I have only just learned how to stick different parts into amps, i don't have an idea how to build them. So far so good.
post #827 of 1953
Quote:
Originally Posted by Frihed89 View Post
Woops. They are harder to build.

Why are electrostatic headphones so hard to drive well, as I guess they must be? Or is that they are also very sensitive and even small amounts of distortion are easy to hear?

I have only just learned how to stick different parts into amps, i don't have an idea how to build them. So far so good.
They operate on a completely different principle than dynamic headphones; instead of being voltage based, they're current based. If you're just starting to build amps, I wouldn't try an electrostatic amp; supposedly they can kill you pretty easily (that's not a joke!).

As to their higher price, I think it's basically supply and demand; there are very few companies that make stats, so the ones that do come out are in high demand.
post #828 of 1953
Quote:
Originally Posted by earwicker7 View Post
As to their higher price, I think it's basically supply and demand; there are very few companies that make stats, so the ones that do come out are in high demand.
i don't think this is why. I think it has more to do with difficulty of build/complexity of a decent design.
post #829 of 1953
Quote:
Originally Posted by earwicker7 View Post
They operate on a completely different principle than dynamic headphones; instead of being voltage based, they're current based. If you're just starting to build amps, I wouldn't try an electrostatic amp; supposedly they can kill you pretty easily (that's not a joke!).

As to their higher price, I think it's basically supply and demand; there are very few companies that make stats, so the ones that do come out are in high demand.

Electrostatic amps are high voltage not high current .... and the high voltage is what is makes electrostatic amps so potentially lethal.
post #830 of 1953
Quote:
Originally Posted by sacd lover View Post
Electrostatic amps are high voltage not high current .... and the high voltage is what is makes electrostatic amps so potentially lethal.
the killer is really the current which flows through the voltage...

v = i x r

i = v/r

high voltage can contain negligible current/amperage = live (e.g. static shock)
but minimal current of about 40mA thru the heart can cause miocardial infarction
post #831 of 1953
Quote:
Originally Posted by takezo View Post
the killer is really the current which flows through the voltage...

v = i x r

i = v/r

high voltage can contain negligible current/amperage = live (e.g. static shock)
but minimal current of about 40mA thru the heart can cause miocardial infarction
Bu, in an amp there is lots of both. Higher voltage will make what current is there get there in full force.
post #832 of 1953
Quote:
Originally Posted by sacd lover View Post
But in an amp there is lots of both. High voltage will make what current is there get there in full force.
i see what you're getting at... and you're absolutely right.
post #833 of 1953
Looks like I may have failed electricity 101.
post #834 of 1953
Quote:
Originally Posted by earwicker7 View Post
Looks like I may have failed electricity 101.
Fear not, you're in good company.
post #835 of 1953
Quote:
Originally Posted by earwicker7 View Post
They operate on a completely different principle than dynamic headphones; instead of being voltage based, they're current based. If you're just starting to build amps, I wouldn't try an electrostatic amp; supposedly they can kill you pretty easily (that's not a joke!).
I think with electrostats (maybe hydrostats, too) load and frequency are directly related. So, if you had a high current amp, you would fry your output stage.

Isn't that why transformer-coupled tube amps can tame reactive loads?
post #836 of 1953
I'd like a hydrostatic amp.

On a more serious note, good advice about 'limiting the scope' when talking to Mikhail about building a custom amp or repairs.

He doesn't exploit our weakness so much as indulge his addiction to tinkering and then getting us to pay for it.

Dan's example is extreme but probably not unusual and I have to say I'd feel rather upset with how far Mikhail has pushed it with him if the same happened with me.

I hope he and Tom (and Rob) have happy endings to their long waits. Good luck guys.

Oh yes - I'm waiting for a Concerto XLR, ordered in Feb this year after picking up an HE90. Decided to go SS PSU as I didn't have room on my desk for the tube one - probably just as well. I expect it towards the end of 2009/beginning of 2010
post #837 of 1953
I wouldn't even say my example is all that extreme. I think Tom's is much scarier

Interesting he always tell me there's only ~4 big ticket amps on his plate and that he is almost through them, but with your concerto the number I know about increases to at least 6 (I am not even counting mine since its basically done or wahtever). Maybe his definition is different from mine.
post #838 of 1953
Quote:
Originally Posted by Icarium View Post
I wouldn't even say my example is all that extreme. I think Tom's is much scarier

Interesting he always tell me there's only ~4 big ticket amps on his plate and that he is almost through them, but with your concerto the number I know about increases to at least 6 (I am not even counting mine since its basically done or wahtever). Maybe his definition is different from mine.
I have been using the amp in my speaker system comparing it to a BAT VK-42se. It is very nice, but so is the BAT(for more $$$). Will decide who stays and who goes after the new PSU gets here. The only headphones I have here are SE 650s.
post #839 of 1953
Quote:
Originally Posted by tom hankins View Post
I have been using the amp in my speaker system comparing it to a BAT VK-42se. It is very nice, but so is the BAT(for more $$$). Will decide who stays and who goes after the new PSU gets here. The only headphones I have here are SE 650s.
Glad to hear that it's okay.Gives me hope that mine (whenever it gets delivered) will be okay although mine is a more complicated design
post #840 of 1953
Actually the current doesn't cause an infarct, an infarct is a cessation of the flow of blood which causes death of the tissue, but it is the depolarization of the heart muscle, as in a flat line. I often will use 20 to 30 mA's on a heart to keep it beating right but done out of sync, well it ain't fun because a depolarized heart can not be shocked back as there is nothing to shock to cause a beat i.e., nothing to depolarize.
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