Vortrex did I read correctly that you recommend a phono RIAA PRE stage to phono cartridge price ratio of 10 to 1 and recently upgraded to a phono RIAA PRE stage to phono cartridge price ratio of 20 to 1?   Please tell me more about your Denon DL 103R.   I am looking to extract more out of mine by upgrading from my Graham Slee Reflex M and Denon AU-300LC 1:10 ratio SUT to something else.  The 103r I am using was purchased from the comet supply store and is not a graded cart i.e.: "tolerance between L&R output voltage and internal coil impedance" being less than  or equal to 1 percent.   Vortrex do you have a  graded 103R?   And are you currenlty using an upgraded cantilever and stylus and body with your 103 R?  I am just curious because it just seems unlikely for one to pair such an inexpensive cartridge with such an expensive phono RIAA PRE stage unless your 103r is graded 2 prime(a ZU ranking) with upgraded wood or aluminum body with ruby cantilever and with a Contact Line stylus which would change the phono RIAA PRE stage to phono cartridge price ratio to 2 to 1 and 4 to 1. 
 
 ZU Rankings
"tolerance is referenced between the two channels' internal resistance and output Voltage"
Denon DL 103R Standard                ≤ 4.0%  
Denon DL 103R Grade  1                 ≤ 1.0%  
Denon DL 103R Grade  2                 ≤ 0.5%  
Denon DL 103R Grade  2 Prime (2') ≤ 0.1%
ZU
Denon DL 103 Grade 2 PRIME     $874 0.1% inter-channel tolerances
Denon DL 103 2                          $749 0.5% inter-channel tolerances
Denon DL 103 1                          $624 1.0% inter-channel tolerances
Denon DL 103 (standard grade) $549 2.0% inter-channel tolerances
Soundsmith 
Denon DL 103R-Ruby CL                    $829.95  
Denon DL 103R-Ruby CL NUDE          $999.95  
Denon DL 103R-Ruby OC/CL              $929.95  
Denon DL 103R-Ruby OC/CL NUDE  $1099.95 
phono RIAA PRE stage 
Zesto Audio Andros PS1 Vacuum Tube Phonostage Preamp $4,300 
Manley Chinook Phono Stage                                                $2,250