After some hours critical listening, I consider this setup quite acceptable.
As I reported before, my intention is to prepare the 48dB riaa so it can be used with a 0.15mV output cart.
I implemented the SUT with 1:10 configuration and Rload on the secondary side (Riaa side) is 47kr that translates to 470 r real cart load on the primary side.
I do not have the special cart to test so I am listening with a 0.8mV output cart.
Tone is quite good. Overall sound is much better than the one resulting by using a cap to bypass Rsource on first stage.
As per my calculations, Voltage at SUT output is 7.6mV for this 0.8mV cart.
As I do not detect any clipping, I believe the 48dB Riaa can successfully be used even with very high output MM carts.
8.5g their advertised net weight spec. At least this one is close. Thanks a lot. Mass figures noted.
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Boozhoundlabs - Le Pacific
I built this because I though the JAN6418 and OPAMP based phono preamps I was using were not giving me the best. This is a huge improvement over the other two.
Constructed on vero-brd. (strip brd.) with all polypropelene capacitors and metal film Rs. Low ESR storage caps (snubbed) and a 10,000uf cap (also snubbed) across the PS fed from a 1ohm 5W R.
Silver solder and wirewrap wire for hookup wire with ferrite beads on all input wires and PS leads. Housed in an embossed gold chocolate box with bitumanised Al foil lining. Currently powered from 3 X 9V lithiums. And sounds absoluty excellent.
This is the boozhoundlabs version of Le Pacific. I like the way he de-couples the PS V+ rail with 10ohm Rs and (in my build) 220uf low ESR caps (snubbed) at each end of the de-coupled rail.
I built this because I though the JAN6418 and OPAMP based phono preamps I was using were not giving me the best. This is a huge improvement over the other two.
Constructed on vero-brd. (strip brd.) with all polypropelene capacitors and metal film Rs. Low ESR storage caps (snubbed) and a 10,000uf cap (also snubbed) across the PS fed from a 1ohm 5W R.
Silver solder and wirewrap wire for hookup wire with ferrite beads on all input wires and PS leads. Housed in an embossed gold chocolate box with bitumanised Al foil lining. Currently powered from 3 X 9V lithiums. And sounds absoluty excellent.
This is the boozhoundlabs version of Le Pacific. I like the way he de-couples the PS V+ rail with 10ohm Rs and (in my build) 220uf low ESR caps (snubbed) at each end of the de-coupled rail.
Attachments
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