Hi, a lot of questions.
I just finished the schematic and the parts value list.
I am sure this will answer some questions.
Please note that triode V9 1/2 ECC83 has a positive grid.
Have a look at the voltage droppings at this stage.
This increases the output resistance of a triode.
Very importand:
The DC current of V1/V5 is ten times of the DC current of V2/V6
and the DC current of V3/V7 is a bit more than two times of the V2/V6 current.
daviddeakin wrote:
"Also, I would argue that there are resistors and capacitors in the signal path, because all of the components play some part in signal flow. The signal does not simply follow the path you have drawn, like a mouse in a maze."
I can not see another way than the "red line" for the signal flow
.
Please note that supply rails are signal ground
.
To minimize the influence of surrounding parts in the signal you must follow some triode design rules:
Kathode follower: The pull dowen resistor in parallel to the output load must be much (say 10 times) higher than the mutal conductance.
Kathode base/ grid base: The pull up resistor in parallel to the output load must be that high that the triode reaches micro gain.
This is why I made these current settings in the cathode coupled stages
.
Component values for the dc coupled triode RIAA preamp 2007
R1 47K
R2 470R (optional)
R3 22K
R4 22K
R5 1K
R6 47K
R7 10K
R8 47K
R9 1Meg
R10 47K
R11 2M2
R12 22K
R13 22K
R14 10K
R15 47K
R16 22K
R17 1K
R18 47K
R19 1Meg
R20 47K
R21 22K
R22 2M2
R23 10K
R24 2K2
R25 470R
R26 2K7
R27 11K two 22K resistors in parallel
R28 2K2 (optional)
RV1 22K
RV2 22K
C1 220p (optional)
C2 4µ7
C3 47µ 63VDC
C4 4µ7
C5 1µF MK 50VDC
C6 18n
C7 1µF MK 50VDC
C8 1µF MK 50VDC
C9 4µ7
C10 47µF 63VDC
C11 1µF MK 50VDC
C12 4µ7
C13 1µF MK 50VDC
C14 220pF
C15 1µF MK 50VDC
C16 4µ7
C17 47µF 63VDC
C18 100µF 16VDC
V1 ½ ECC83
V2 ½ ECC83
V3 ½ ECC82
V4 ½ ECC82
V5 ½ ECC83
V6 ½ ECC83
V7 ½ ECC82
V8 ½ ECC82
V9 ½ ECC83
V10 ½ ECC83
Kind regards,
Darius