06-02-2021, 07:38 PM
So, I replaced the caps in them as close as possible, yet I have another question.
This is radio I built from the ground up. I even designed the circuit board. I chose to use the generation of 12SA7, 12SK7 and 12SQ7 set.
Is anyone familiar with the impedances these circuit require?
I have an input transformer for the 1st stage and an output transformer for the 2nd stage. The input transformers caps are 107 pF one side and 137 pF on the other. The output transformer caps are 110 pF on one side and 138 on the other.
The question is on each set, which way does the side with the lower value capacitor go? Would the higher impedance go on the side that the output tube plate is connected to and the lower impedance on the grid side (1st stage) or detector side (2nd stage)?
Since a tank circuit balances out to lower capacitor/higher inductance or higher capacitor/lower inductance both balancing out to 455kHz, my gut feeling is that the low capacitor/higher inductance would go with the higher voltage side of the circuit. I just don't yet know enough about IF transformer impedances.
This is radio I built from the ground up. I even designed the circuit board. I chose to use the generation of 12SA7, 12SK7 and 12SQ7 set.
Is anyone familiar with the impedances these circuit require?
I have an input transformer for the 1st stage and an output transformer for the 2nd stage. The input transformers caps are 107 pF one side and 137 pF on the other. The output transformer caps are 110 pF on one side and 138 on the other.
The question is on each set, which way does the side with the lower value capacitor go? Would the higher impedance go on the side that the output tube plate is connected to and the lower impedance on the grid side (1st stage) or detector side (2nd stage)?
Since a tank circuit balances out to lower capacitor/higher inductance or higher capacitor/lower inductance both balancing out to 455kHz, my gut feeling is that the low capacitor/higher inductance would go with the higher voltage side of the circuit. I just don't yet know enough about IF transformer impedances.
