coil winding (4)

Presto 1-D Cutter Head Feedback Modification

Presto 1-D and 1-C cutter heads are frequently encountered on our lab bench for repair and restoration. Some are just regular repairs to original spec, others are rewound to a different impedance, but some undergo more comprehensive and exciting modifications!

We have previously examined modifications where a feedback system was added to a Neumann MS-52H and an Audax R-56 cutter head. This time, we shall discuss adding feedback to a Presto 1-D, which arrived with damaged coils.


[MISSING TRANSLATION] J. I. Agnew

Rebuilding an Audax R-56 Cutter Head with Feedback

This Audax cutter head arrived with a fried coil and a completely crusted armature. The damping material had not aged well.

A complete disassembly, cleanup and reassembly would be required, with the renewal of the damping material and drive coil. This was yet another perfect candidate for our feedback modification.

[MISSING TRANSLATION] J. I. Agnew

Neumann MS-52H Cutter Head with Feedback: Repair and Hot Mods

This Neumann cutter head arrived as a particularly clean example, but in need of repair. The first obvious issue was that the coil was fried.
The second issue was that the original stylus fitting was broken.

[MISSING TRANSLATION] J. I. Agnew

Precision Transducer Development

This item is the latest addition to our collection of experimental transducer prototypes. What you see is a multi-layer miniature winding on a custom machined former, entirely made in-house at the Agnew Analog Research & Development Laboratory.

 

[MISSING TRANSLATION] J. I. Agnew