My experience wirh the Soundmirror that I owned in the sixties was
that the electronics were rather primitive and very noisy, which I
believe explains more than a permanent magnet head. Much the same
experience was had with the Webster-Chicago (Webcor) wire recorders
from about the same time.
On Tue, Oct 30, 2018 at 10:34 AM Douglas Pomeroy <[log in to unmask]> wrote:
> The recorder was my father's, and I don't think he recorded over previous recordings.
> But, yes, the erase head was a permanent magnet. The noise level was no doubt due
> to the electronics and would certainly be higher than with a more modern recorder.
> Date: Mon, 29 Oct 2018 22:26:55 +0800
> From: Tim Gillett <[log in to unmask]>
> Subject: Re: Soundmirror tapes
> Thanks Douglas,
> It seems then that so far, the sticking winds is an isolated case.
> I mentioned earlier that the very high noise floor seems confined to the
> actual recording. I suspect the machine used initially (early 1950's) was a
> Soundmirror which apparently used a permanent magnet erase head. When I
> made a new recording on an unused piece of the paper tape, on a modern era
> machine (Nagra 4.2), the noise was much lower than on the original
> Tim Gillett
> Douglas Pomeroy
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