A couple owners have reached out to me privately on proper torquing of the VTA block. So I thought it would be good to rehash the procedure here now. See the picture 35 on my virtual system for reference.
lt is done with the VTA block - NOT - mounted. Hold in your hand and use the feeler gauge.
The Gap value is arbitrary based on personal preference. Ensure you do not over torque.
Bruce' instructions follow
***************************************************
.
lt is done with the VTA block - NOT - mounted. Hold in your hand and use the feeler gauge.
The Gap value is arbitrary based on personal preference. Ensure you do not over torque.
Bruce' instructions follow
***************************************************
.
Chris,
My first rule would be to use the short end of the Allen wrench as the lever for torquing any screws on the ET-2. The short lever arm will limit the applied torque.
For the two bearing blocks that mesh the pinion to the rack in the arc block we first adjust the blocks so that they are parallel to the manifold housing with a .060 -.090 gap between the bearing block and the back adjacent surfaces on the manifold housing.
The friction between the manifold housing and the arc block define the feel of the VTA mechanism lever action. We want this to offer some resistance, but not too much when a VTA adjustment is attempted. Turn the 4/40 x 3/4 bearing block screws so that some friction is encountered when adjusting VTA but not so much that the VTA mechanism locks up. We would not attempt this adjustment with the tonearm installed on a turntable.
The main failures we see with the arc blocks are:
1.The threaded insert on back surface of the arc block is cracked due to over torquing of 8-32 stainless steel button head post mounting screw.
2.The bearing blocks on either side of the arc block which support the pinion gear are over torqued which crushes the pinion into the rack and binds the mechanism, if a VTA change is attempted with over torqued bearing blocks the pinion turns and the rack does not move, stripping the teeth on the rack.
I hope the above helps
- brucet