I just looked at the schematic.
It seems there is some filtering at the output: 750 (820, 910) ohms, 100 nF, and a 1 uF output capacitor.
Most transformers like to be driven from a low impedance.
Also there is a risk that the 100nF + 1 uF will produce a resonance with the inductance of the transformer winding.
Personally I would prefer an extra buffer stage that drives the transformer from a low impedance.
And move the DC blocking cap after the buffer stage, right?
My better option is maybe to go to op amp balancing stage and drop transformer.
Lundahl, Sowter, and Carnhill would be the 3 I can think of for Europe. OEP as well for a cheaper option.
Yes, I forgot Carnhill, thank you.
If you decided to use 2 opamp RIAA (nothing fancy) why not opamp balanced driver?
https://sound-au.com/project51.htm
Yes, you're right. It's a cheaper way and probably easier. I guess I’ll try this.
The reason I thought of transformer option is:
- magic dust it could add to the sound
- I have four LME49710 laying around in TO-99 box, not eight
But I could use another op amp for balancing. I'll look for a TO-99 one: I already have LM317/LM337 regulators in TO-99, I'd like to keep the visual coolness because the box will be transparent PMMA
