Hi folks,
I have a few 6AS7G tubes at my disposal.
I'm actually using them as output tubes, in cathode-follower arrangement.
They eat up a lot of heater current but look good..
Anyway, now I want to try them in a classic grounded-cathode topology.
So, what do you guys think of these values?
(forgot to add an 1k grid stopper)
Will feed a following tube stage.
I would appreciate your help, since I am not very confident I got this right.
Thanks!
I have a few 6AS7G tubes at my disposal.
I'm actually using them as output tubes, in cathode-follower arrangement.
They eat up a lot of heater current but look good..
Anyway, now I want to try them in a classic grounded-cathode topology.
So, what do you guys think of these values?
(forgot to add an 1k grid stopper)
Will feed a following tube stage.
I would appreciate your help, since I am not very confident I got this right.
Thanks!
Are you aware that the amplification factor (μ) of this tube type is only 2, meaning that in your topology you'll probably have a gain very close to 1?
Yes, I know.
It is an experiment to compare it against a cathode follower.
I'll be fine with a gain just slightly above 1.
So, do you see any problems in the schematic?
Also, what's the output impedance in this arrangement?
Well, you get about Ia=25mA, Vg1-16V and Va=45V with a gain of 3dB.
And decoupling the cathode resistors 6dB.
Oh, and an output impedance of less then 500Ω (decoupled cathode).
Mona
And decoupling the cathode resistors 6dB.
Oh, and an output impedance of less then 500Ω (decoupled cathode).
Mona
Thanks.
Any suggestions/improvements regarding resistor values?
The intention is to compare it to a 6AS7G cathode-follower that's used as a buffer after a DAC.
In particular, a LITE DAC-AH with passive I/V and AC-coupled by capacitors at its output.
Any suggestions/improvements regarding resistor values?
The intention is to compare it to a 6AS7G cathode-follower that's used as a buffer after a DAC.
In particular, a LITE DAC-AH with passive I/V and AC-coupled by capacitors at its output.
Cc is too big, 0.22uf is enough.
I do a simulation of a simple cathode follower and found that FFT is very similar to your sketch. If the current is increased by reducing cathode resistor to half, you got fft with 2nd harmonics reduced. Not sure how sonic wise is like, it may paid to input and record a wave file instead of sig. for more listening experience.
I do a simulation of a simple cathode follower and found that FFT is very similar to your sketch. If the current is increased by reducing cathode resistor to half, you got fft with 2nd harmonics reduced. Not sure how sonic wise is like, it may paid to input and record a wave file instead of sig. for more listening experience.
