797 hf schoeps de emphasis

[Khron]

Not at all - how and why would that work?

That's just a second resistor in parallel with the drain resistor (resulting in less than 700 ohms), and another capacitor from the supply rail to ground.

You do know how a "series RC" looks like, right? A resistor in series with a capacitor.

Now, you take that arrangement, and connect it in parallel with the drain resistor (the free end of the resistor to one end of the drain resistor, and the free end of the capacitor to the other end of the drain resistor).

 

[Whoops]

Now, you take that arrangement, and connect it in parallel with the drain resistor (the free end of the resistor to one end of the drain resistor, and the free end of the capacitor to the other end of the drain resistor).

Could you make a drawing please?

 

[Matador]

Could you make a drawing please?

Instead of the switch (SW), imagine it's the drain resistor.

 

[Whoops]

Instead of the switch (SW), imagine it's the drain resistor.

Thank you so much mate,
I highly appreciate it

 

[kingkorg]

Isn't this described as inferior method in Henry Spragens' analysis? It works, but you somewhat un-ballance the signal. It also depends on how well your preamp input is balanced. High end on one of the pins gets filtered out, but the other pin gets boosted high end.

 

[Khron]

On one hand, you'd be hard pressed to find a preamp that's not properly balanced nowadays. On the flip side though, people like Ruud say that Henry's method introduces noticeable amounts of noise.

May well be a case of "pick your poison"?

Isn't this described as inferior method in Henry Spragens' analysis? It works, but you somewhat un-ballance the signal. It also depends on how well your preamp input is balanced. High end on one of the pins gets filtered out, but the other pin gets boosted high end.

 

[kingkorg]

Get it, it stays impedance balanced anyways, right?

 

[Khron]

At least for the most part, as far as I can figure. The output PNP's drop / adapt the impedance indeed.

Iirc, they worked as emitter followers, with the phantom power resistors as the "load".

 

[Whoops]

It works, but you somewhat un-ballance the signal.

Also is not the most interesting filter to solve the issue. The problem is 2 Peaks in the High End.
This filter is a low pass filter, although reducing the peak it doesn't solve it and also steals away the Air (above 12 KHZ)