What I really do not 100% understand is the 100 Ohm base resistor. For one it is a stopper for parasitics so it can stop Oszillation tendencies.
Another approach. Current combined in the 2 input transistors is 12mA. Ube is around 0,6V.
So dynamic impedance from base to emitter is 50 Ohm. But there is the cartridge in parallel.
In my case a Lyra Atlas with 5 Ohm winding impedance.
So dynamic impedance from base to emitter is 50 Ohm. But there is the cartridge in parallel.
In my case a Lyra Atlas with 5 Ohm winding impedance.
I am in a process to make a single ended pre-pre with no cap at the input and compare the sound to the circuit I showed here recently.
Next comes a circuit with no cap at the input AND the output. That is parallel symmetric though.
AS Audio asked in another thread if there is a phono amp available with adjustable input offset. For one there is the Paradise with a trimmer at the input.
Marvel has shown designs with input servo.
I am working on a single ended circuit that needs no input cap. Here we have PNP transistors at the input with an NPN Rush Cascode. It can be level shifted to bias the input transistors to Ube positive ( ca. 0,67V ). Than can be made adjustable. Do not take the circuit too serious. I am still working on the values. It should work though.
Marvel has shown designs with input servo.
I am working on a single ended circuit that needs no input cap. Here we have PNP transistors at the input with an NPN Rush Cascode. It can be level shifted to bias the input transistors to Ube positive ( ca. 0,67V ). Than can be made adjustable. Do not take the circuit too serious. I am still working on the values. It should work though.
