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Hi to all!
I am currently designing my first ever amp. To assist me I have an electronics training manual issued to army and navy recruits in the early 1960s (why not airforce?) and help from people on the interweb.
I have no previous electronics experience, which is why some of my questions will probably seem a bit silly.
Please bear in mind, I am designing at this stage so do not yet know for definite things like what valves will be in the power amp... I must design the preamp section first!!!
Signal coming from my first triode goes through a resistor and a capacitor before being fed to the grid of the next triode. That's ok, I get that. How do you choose the value of the resistor and the cap? I know what they're there to do and have them indicated on my evolving schematic, but do not know how to choose the values because...
I have been told that the value should be determined by the type and performance of the valve that I am using and that this can vary even between different manufacturer's versions of the same valve. Which would mean that until I was ready to build the thing and purchased the valves I would not be able to calculate the required value beacause I wouldn't know how the valves would perform. That can't be right surely?
I am assuming that the resistor value will need to increase between each subsequent valve because the signal will be larger and so need to be reduced more to prevent overloading the lext valve? If so is there a method of calculating the correct value given that the valve data should enable me to work out how much the signal will be increased by and since I know what I will need as an input level for the next grid I should be able to calculate the size of resistor needed?
I am currently designing my first ever amp. To assist me I have an electronics training manual issued to army and navy recruits in the early 1960s (why not airforce?) and help from people on the interweb.
I have no previous electronics experience, which is why some of my questions will probably seem a bit silly.
Please bear in mind, I am designing at this stage so do not yet know for definite things like what valves will be in the power amp... I must design the preamp section first!!!
Signal coming from my first triode goes through a resistor and a capacitor before being fed to the grid of the next triode. That's ok, I get that. How do you choose the value of the resistor and the cap? I know what they're there to do and have them indicated on my evolving schematic, but do not know how to choose the values because...
I have been told that the value should be determined by the type and performance of the valve that I am using and that this can vary even between different manufacturer's versions of the same valve. Which would mean that until I was ready to build the thing and purchased the valves I would not be able to calculate the required value beacause I wouldn't know how the valves would perform. That can't be right surely?
I am assuming that the resistor value will need to increase between each subsequent valve because the signal will be larger and so need to be reduced more to prevent overloading the lext valve? If so is there a method of calculating the correct value given that the valve data should enable me to work out how much the signal will be increased by and since I know what I will need as an input level for the next grid I should be able to calculate the size of resistor needed?
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