The Yaoin Tube buffer...:
Arne K
Hi, I have a board with 6j1 that has a circuit same as this but with different voltage and resister values.
The plate voltage is 83V.
The resistor 30K is 330K, 1k is 470R (Rb), 20k is 2K (Rk).
I am using a Russian 6j1p tube now and I wonder if the Rk value is too low.
I have tried to use the cathode follower calculator but I have no idea how to read the values from the datasheet I found here.
TIA if anybody can help me read those values.
file:///D:/_temp%20DNG/_audio/Tube/6Z1PEV%20english%20data.pdf
Hi ChuckT;
nobody can read a file on your hard drive. To get an idle current you may divide voltage drop on 30K on it's value. Then multiply it by 470 Ohm and get a voltage between G1 and cathode. Looking at the curves, check if it is the voltage needed for such a current.
nobody can read a file on your hard drive. To get an idle current you may divide voltage drop on 30K on it's value. Then multiply it by 470 Ohm and get a voltage between G1 and cathode. Looking at the curves, check if it is the voltage needed for such a current.
My apologies, I copy the wrong link to my computer.
Here is the correct one.
http://www.mif.pg.gda.pl/homepages/frank/sheets/112/6/6Z1PEV.pdf
Cathode (pin 2) voltage is 7.67V, G1 (pin 1) is 3.57V , so is 3.57v - 7.67v = -4.1V the bias voltage. Sorry, this buffer is my first real attempt for tubes.
Voltage drop between 330k is 0.83V
Here is the correct one.
http://www.mif.pg.gda.pl/homepages/frank/sheets/112/6/6Z1PEV.pdf
Cathode (pin 2) voltage is 7.67V, G1 (pin 1) is 3.57V , so is 3.57v - 7.67v = -4.1V the bias voltage. Sorry, this buffer is my first real attempt for tubes.
Voltage drop between 330k is 0.83V
Last edited:
My apologies, I copy the wrong link to my computer.
Here is the correct one.
http://www.mif.pg.gda.pl/homepages/frank/sheets/112/6/6Z1PEV.pdf
Cathode (pin 2) voltage is 7.67V, G1 (pin 1) is 3.57V , so is 3.57v - 7.67v = -4.1V the bias voltage. Sorry, this buffer is my first real attempt for tubes.
Voltage drop between 330k is 0.83V
Sorry, I think I am quite mixed up.
Pin 1 (G1) is -0.41V (another channel is -0.47v)
Rk (2k resistor) is 3.3V
Hi, some questions for modification.
I have a yaqin cd1 with original 12ax7, how much current originally flows in the tube?
in your opinion how much current is the transformer able to supply?
if I modified it with an ecc88..I would need more current.
I would like an ecc88 and more current.
Thanks
I have a yaqin cd1 with original 12ax7, how much current originally flows in the tube?
in your opinion how much current is the transformer able to supply?
if I modified it with an ecc88..I would need more current.
I would like an ecc88 and more current.
Thanks
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