Normally with phono amps a regulated or choke filtered B+ is advised but here is a what if.
Let's say one uses a decent RC filtered supply and uses a plate choke load on the first stage. In theory the first stage noise contribution is the most critical and high gain is desired there. Of course an active load would be another reasonable option I think.
Would the PSRR and increased gain be sufficient? Something on this order. R load used on second stage to allow DC couple to CF.
Let's say one uses a decent RC filtered supply and uses a plate choke load on the first stage. In theory the first stage noise contribution is the most critical and high gain is desired there. Of course an active load would be another reasonable option I think.
Would the PSRR and increased gain be sufficient? Something on this order. R load used on second stage to allow DC couple to CF.
If you use local PS filtering for EACH stage, the PSRR can reach even 50dB, which is enough good.
The main problem is the anode choke.
400H choke with low parallel capacitance is rare as the white raven.
If the choke has -for example- 300pF capacitance, the upper -3dB does not exceed 20kHz.
Placement always problematic, hum, radiated noises (for example cell phones) mainly occurs.
IMHO active loading (cascode CCS, gyrator) better for first stage.
The main problem is the anode choke.
400H choke with low parallel capacitance is rare as the white raven.
If the choke has -for example- 300pF capacitance, the upper -3dB does not exceed 20kHz.
Placement always problematic, hum, radiated noises (for example cell phones) mainly occurs.
IMHO active loading (cascode CCS, gyrator) better for first stage.