I had Vacuum Sota/ET2 for a few years before my Final Audio.
No problems on levelling and maintaining level across the record.
No mistracking whatsoever, particularly compared with pivoted arms on demanding tracks.
I did have a couple of records that were noisy on one side and suspected the vacuum system, but have no real proof.
Had no speed issues either but had knocked out half the Papst motorboard and replaced with on board regulation and external regulated power supply.
The ET2 was stripped of all dampening material, custom arm/bearing tube bracket, air supply consisted on dual pumps ( one running out of phase ) and surge tank and added electromagnetic dampening for horizontal movement. Also tweaked the compliance of the decoupled counterweight in the horizontal mode for each cartridge.
No problems on levelling and maintaining level across the record.
No mistracking whatsoever, particularly compared with pivoted arms on demanding tracks.
I did have a couple of records that were noisy on one side and suspected the vacuum system, but have no real proof.
Had no speed issues either but had knocked out half the Papst motorboard and replaced with on board regulation and external regulated power supply.
The ET2 was stripped of all dampening material, custom arm/bearing tube bracket, air supply consisted on dual pumps ( one running out of phase ) and surge tank and added electromagnetic dampening for horizontal movement. Also tweaked the compliance of the decoupled counterweight in the horizontal mode for each cartridge.