Need some advise on a LTP input stage.
Hi all,
I have attached a plan for two different LTP phase splitter input stages. The idea is to hang the whole of the input stage off of a -300V negative rail. I am having some real difficulty conceptualising all of the issues involved so I have a few questions. the LTP is expected to draw about 10mA (20mA for two channels) so it should be possible to create a very stable neg supply with a simple CLC filter. The intention is to go with the pentode version, the triode version is just there to illustrate the basic concept.
1- In the first triode based schematic is the bottom resistor functioning to extend the tail of the LTP, or is it just burning up voltage.
2- In the second schematic will the voltage across R10 stay stable and so not effect the screen voltage.
3- If I substitute a CCS for R10 in the second scheme, how will it find its own anode voltage, and again will that voltage stay stable.
Am I barking up the wrong tree. Are there any issues I have failed to spot.
Shoog
Hi all,
I have attached a plan for two different LTP phase splitter input stages. The idea is to hang the whole of the input stage off of a -300V negative rail. I am having some real difficulty conceptualising all of the issues involved so I have a few questions. the LTP is expected to draw about 10mA (20mA for two channels) so it should be possible to create a very stable neg supply with a simple CLC filter. The intention is to go with the pentode version, the triode version is just there to illustrate the basic concept.
1- In the first triode based schematic is the bottom resistor functioning to extend the tail of the LTP, or is it just burning up voltage.
2- In the second schematic will the voltage across R10 stay stable and so not effect the screen voltage.
3- If I substitute a CCS for R10 in the second scheme, how will it find its own anode voltage, and again will that voltage stay stable.
Am I barking up the wrong tree. Are there any issues I have failed to spot.
Shoog