Are you speaking of the Lentek Head amp ?
because the Entre was imported by Lentek, at that time (circa 79/early 80's) ans frequently sold together.
Anyway, I have the EntrÃ© running on a SL 1000 and it sounds incredibly good, well in my sense, better than my DL 103 and DL 103R...
Only point I'll check is the input impedance, my Denon HA 1000 Head amp is 100 ohms and the cart's impedance is only 3 ohms!
MicroSeiki RX1500VG+Helius Orion/Denon DL103R/ Denon HA1000 or Anzai transformer
Ikeda IT407 12" tonearm / SPU classic GME mkII.
Ortofon SMG 212 / SPU Classic GM E mkII+ Ortofon T20 transformer.
Neat M68 TT / Clément tone arm+ Clement mono c