Hi Eric,
Did you (or anyone else) try this? Fitting one to a CD player as a switched thing, really would prefer gain to be 1
Andy
Also at the risk of being ridiculed. Its been a while since I looked at valve circuits
Valve 'b' has the grid at 0v relative to the cathode both at -30? that can't be right (?) it obviously works. Am I missing the forest for the trees here?
Question:
Why is C102 even there? Is it because the voltages are insufficient and the full ~60v is required across both tubes? Seems to me there is an opportunity to set DC conditions on V2 with a resistive level shifter and use the feedback ratio to compensate for what I imagine will be some attenuation?
Appreciate I'm digging here
Andy
Valve 'b' has the grid at 0v relative to the cathode both at -30? that can't be right (?) it obviously works. Am I missing the forest for the trees here?
Question:
Why is C102 even there? Is it because the voltages are insufficient and the full ~60v is required across both tubes? Seems to me there is an opportunity to set DC conditions on V2 with a resistive level shifter and use the feedback ratio to compensate for what I imagine will be some attenuation?
Appreciate I'm digging here
Andy
Last edited:
Resurrecting this old thread with a question.
To add gain to the X10D do you only have to change the 1.5K resistors or is there anything else that needs to be changed?
i,e, do any of the capacitors need to be changed to a smaller value? I read that the // capacitor has to be changed to -5 times smaller for a near 6 gain, I am looking to add a gain of around 3 to this circuit, I know what resistors to change, but not sure about the capacitors or even where they are located.
Any help is appreciated.
Cheers
To add gain to the X10D do you only have to change the 1.5K resistors or is there anything else that needs to be changed?
i,e, do any of the capacitors need to be changed to a smaller value? I read that the // capacitor has to be changed to -5 times smaller for a near 6 gain, I am looking to add a gain of around 3 to this circuit, I know what resistors to change, but not sure about the capacitors or even where they are located.
Any help is appreciated.
Cheers
Ok, I have worked out where the capacitors and resistors have to be changed.
I am looking to increase the gain by 3, I would replace the 1.5K Resistor to 10K but am unsure of what the // capacitor value has to be and how it is calculated. The current value is 220pf, would that have to be reduced by 3 or 2 and what would the actual value be??
I am looking to increase the gain by 3, I would replace the 1.5K Resistor to 10K but am unsure of what the // capacitor value has to be and how it is calculated. The current value is 220pf, would that have to be reduced by 3 or 2 and what would the actual value be??