[soren_brix]

If I read Kevin's earlier post correctly, he is saying T2 can do 500v/15mA at 20kHz into 120pf. Carbon does 450v/18-20mA. That's already a 50v drop despite a higher current and Kevin hasn't mentioned the frequency/load. So it seems that numbers suggest T2 still is at the top of the group in terms of drive capability. I'm sure there are other factors like slew rate based on available device and topology, etc.

Kevin states the load: 120pf , which pretty much resemble the load Lambda/007/009 represent to the amp

The current requirement is governed by the capacitance (load), voltage and frequency, the current requirement drops linearly with voltage assuming the same capacitance (load) and frequency. The calculation is based on 20kHz full swing, however, music usually only contains full swing upto around 6kHz, and drops hereafter.
Minimum current requirement is more likely to be around 6mA-ish,
Having 18mA means that only a third is going into the load, and thus the OS is mush less challenged in comparison to an OS with only 6mA or less current.
As for the voltage swing, it is governed by the rails/power supply, and boils down to the simple fact that caps rated for >550V is expensive, large and hard to come by, thus why Kevin chose a lower voltage for the Carbon.

Its all about speed and overhead.

 

[kevin gilmore]

in the previous post in all cases for all voltages, the stax standard load is 120pf. which includes the cable.
voce is a bit more at 130pf (actual measured)
kse1500 headphone are 80pf (actual measured)

the current source for the carbon is a 900v part which limits the power supply voltages to 450v
there is an alternate part that does 1000v, some who have done this think it does not sound as good

the power supply is indeed another issue. If you want to make 500v power supplies, you need the primary
caps to be 550v rated or more, and those are hard to find.

the circlotron which uses 900v power supplies uses double the number of power supply caps, 2 in series for each voltage. ends up pretty huge. and pretty dangerous.

 

[Ojisan]

Thanks @soren_brix and @kevin gilmore for the insight! I understand the importance of supply and how that’s another whole art!

So on linear relationship of current vs frequency, is there a notion of higher current requirement for estats at very low frequency? Or does estat stay constant capacitance (impedance) across frequency?

 

[soren_brix]

Thanks @soren_brix and @kevin gilmore for the insight! I understand the importance of supply and how that’s another whole art!

So on linear relationship of current vs frequency, is there a notion of higher current requirement for estats at very low frequency? Or does estat stay constant capacitance (impedance) across frequency?

V(t) = A sin (w t), and C = Q / V => V = Q / C, both derived with respect to time, and re-arrange for I, one get:

I = A * 2pi * f * C

 

[AudioThief]

have you tried to make it really hard to access your srm-252? it might sound EVEN GREATER that way ;o)

.


V(t) = A sin (w t),

I = A * 2pi * f * C

What is that even supposed to mean? Do you think thr 252s is the only estat amp Ive heard or owned? Gotta love the elitism, pretty laughable

 

[soren_brix]

What is that even supposed to mean? Do you think thr 252s is the only estat amp Ive heard or owned? Gotta love the elitism, pretty laughable

just ignore the comment please

 

[Mach3]

in the previous post in all cases for all voltages, the stax standard load is 120pf. which includes the cable.
voce is a bit more at 130pf (actual measured)
kse1500 headphone are 80pf (actual measured)

the current source for the carbon is a 900v part which limits the power supply voltages to 450v
there is an alternate part that does 1000v, some who have done this think it does not sound as good

the power supply is indeed another issue. If you want to make 500v power supplies, you need the primary
caps to be 550v rated or more, and those are hard to find.

the circlotron which uses 900v power supplies uses double the number of power supply caps, 2 in series for each voltage. ends up pretty huge. and pretty dangerous.

Does a working circlotron exist in this universe? I keep hearing about it but it rarer than unicorns. Photo would be nice.
Thanks in advance.

 

[tumpux]

define working..

 

[Mach3]

It's when you turn the unit on and it doesn't divide your head by infinity

 

[protoss]

Does a working circlotron exist in this universe? I keep hearing about it but it rarer than unicorns. Photo would be nice.
Thanks in advance.

 

[protoss]

A15 Circlotron $500

 

[staticdynamo]

New STAX Conpany Profile video on YouTube.

 

[Dan Lee]

Sorry to break topic. Have any of you heard or heard anything about Vincent Audio's SA-32 preamp?

 

[thinker]

i'm dreaming of a graphene coated electrostatic driver

 

[Sound Eq]

i'm dreaming of a graphene coated electrostatic driver

and ???