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RE: First stage phono preamp transformer output coupled




Hi Kevin,
I tried to simulate with LTspice the input stage with E810F.
With resistive RL=10k provide excellent performances, however with LL1671 4:1 coupled to output load of 600ohm (lcr riaa network), appears that the low frequency response suffers an attenuation from 100 Hz...
I suppose that 600ohm on the secondary is about 10k reflected on the primary.
I wrong anything or do you think there is some other more suitable transformer to use?
I tried to replace it with the LL1692 and everything in spice seems ok, but obviuosly this may not work with 30mA bias...
Thank you.
Alberto.


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