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In the Forum: Analog Playback
In the Thread: Tell me about more about Ortofone SPU Sound.
Post Subject: SPU Mono, fact & conjecturePosted by Brian Clark on: 6/3/2008
Per Winfeld confirmed to me that the coil former assembly is rotated 45% compared to the regular SPU such that only lateral motion is sensed. Unfortunately I did not think to ask him how the coil/coils was/were wound. Since the quoted DCR is significantly higher than for the SPU GM - 100ohms vs 6 ohms - I can only speculate that (a) there are more turns on the the former and (b) there are two coils are connected in series and the two outputs are taken in parallel.
My SPU Mono is currently with Expert Stylus for re-tipping and I have just rung them but unfortunately Mr Hodgson Snr, who had a long working relationship with Winfeld until the latter's retirement, was not in. Hopefully I should be able to establish the facts with him tomorrow.
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