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supa phono preamplifier pcb

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#29
Questions ;-).
I want to bypass the power supply used on the schematics and would like to use my own 18v dual power supply.
For this, I do not know if I have to bypass T19/20 and R16/20 too?
Could someone help me understand if T19/20 are needed for the RIAA stage or for the PS ?
Best,
https://image.noelshack.com/fichier...-super-low-noise-preamp-circuit-souplesse.jpg
20 too
 
#30
souplesse said:
Questions ;-).
I want to bypass the power supply used on the schematics and would like to use my own 18v dual power supply.
For this, I do not know if I have to bypass T19/20 and R16/20 too?
Could someone help me understand if T19/20 are needed for the RIAA stage or for the PS ?
Best,
https://image.noelshack.com/fichier...-super-low-noise-preamp-circuit-souplesse.jpg
20 too
Click to expand...

Hi,

you can bypass T18/20 and R16/20 and C9/10 (called gyrotor in the original article), they are used for noise reducction on the power supply, or simply bypass only the ps regulator (IC1/2, C11/12 and C13/14) and check the result for noise. Depends how good your own +/- 18 V PS is, regarding noise.

BR
Günni.
 
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