Thanks for the data.I'm using the Lundahl 1678. 1:16 for the Denon 103. I have a 3k83Ω termination resistor in parallel with the Shure SE22 47kΩ input termination resistor. The SE22 data sheet says there is 54dB of gain. I'm using at least 50dB gain in this setup to get 7cm/sec lateral to +4dBu.
Gain of 74 dB (1 kHz) overall or about 5000. (Av=5011)
With the 250 uV Dennon DL-103 that works out to be 1.25 Vrms.
Probably a TAD less due to insertion loss of the L-1678.
The active input gain would then need 60-66 dB gain.
With 66 dB in the flat front-end, plus about 2 dB gain in the post-RIAA EQ stage, plus the final 6 dB gain in the balanced out it looks like I easily get to +74 dB gain and +4 dBu EQ'd output.
For a 100 uV cart there needs to be 8 dB in the post-RIAA stage to get to +4 dBu.
I doubt it will be as quiet as the Lundahl and probably not as quiet as a super-duper single-ended active input.
The Lundahl has the advantage of noise-free gain, high intrinsic common mode rejection and almost-infinite common mode impedance.
Wow, thanks Paul.I have an extra set of 1678's currently wired 1:32 for the Ortofon SPU. I'd be happy to send them to you to check out if you think it would be useful.
What I need more than anything is a MC cart.
Amazon had the DL-103 for $169 and I noticed that they dropped in the last couple of days to $165.
What I might do is have you do that comparison on your end.
One possible combination I just thought of is the Lundahl ahead of the flat MM preamp.