Re: [ARSCLIST] Ampex 456 - tip of the iceberg...chemistry

[David Lennick <dlennick@xxxxxxxxxxxx>]

There's some virgin Shamrock in an estate collection (records) I've been going
through over the last few weeks. I also have samples of every configuration
they put out, and since I used it mostly for transferring LPs which I've since
obtained, I'm sure I could provide a few samples for experimentation.

dl

Lou Judson wrote:

> Thanks very much for this considered postin, Richard. In the late 70s
> we were using Shamrock 7" castoffs, and it seemed that some of it was
> backcoated and some was not, as a manufacturing defect as the oxide
> looked ad performed the same to our untrained ears. Would it be helpful
> if I could ghet some samples like this? I'm not sure I can, and not
> assurance that it was a similar batch if so, but it has me wondering...
>
> Lou Judson ? Intuitive Audio
> 415-883-2689
>
> On Jun 16, 2006, at 5:05 PM, Richard L. Hess wrote:
>
> >
> > We can create a hypothesis that back-coating in contact with binder
> > has a catalytic effect on the degradation of the binder.