Musical Fidelity XLP2 upgrades


Feels like this XLP2, and probably my phono interconnect, are weak links. VPI Scoutmaster, ZYX Fuji .48v, available MC loading 10R, 25R, 50R, and 100R on the LP2, interconnects are older Synergistic and not specifically designed for phono. My main question, for anyone up on the guts of a phono stage is this. I see 2 poly caps in each channel, one in signal path near input, and one in the signal path near output (105J = 1.0uF, both). Which is most important to sound quality, or both are equal? Obviously this is not a great phono preamp, but why not improve it. Also looking at replacing all the electrolitics, wiring, jacks, and load resistors. 100kohm at the MM input, by the way, not 47kohm. And it took me 2 days to figure out how the MC load resistors and switch work, with one resistor hard-wired and 3 on the switch. Confusing! ZYX recommends load to be >100. I think I'm going to put the load resistor at the jack, experiment with greater than 100, and skip the switch entirely. So any help about those poly caps, loading, and general upgrade suggestions would be appreciated. It's winter in Michigan. Even a hot soldering iron sounds good. Thanks people.
240zracer
That's viridian with an "i". Three in fact.

Think of the circuit as a water pipe. If the water flow is restricted at the beginning of the pipe, it will be slow at the end. Likewise, if it is restricted at the end, it really doesn't matter how much water can flow into the beginning.

So yes, absolutely, change all of the caps. Oil caps will have more body, no doubt about it, but they require about 100-200 hours of break in. If you purchase the Russian K-40Y caps, they will probably only cost around $8.00 each. Pretty reasonable. You can always splash out on Jensen copper foil or AmpOhm if the budget is a bit bigger.

But again, the power supply is going to be the most important issue. Address the electrolytic power supply filter caps on the board. You may be able to replace them with film caps like Solens, but even if you have to go electrolytic, go better. Have a look into those diodes, that may be the biggest issue that you have.
One more time, Viridian. About the rectifiers. This is the layout on each of the two boards. 2 1000uF-35v caps, 2 regulators (can't read them), another 2 1000uF-35v, 2 diodes/rectifiers (looks like "symbol of some sort" and then N4000), 2 100uF-35v, 2 1N4007 diodes/rectifiers. Can I replace these rectifiers with IXYS DESI12? IE: Can I go from 1000v, 1a to 1000v, 12a? Or do you have a better suggestion altogether? Appreciate your help.
What an idiot. What I thought was a goofy symbol is the upside-down 4 in the 1N4007. Getting crosseyed.