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Path: utzoo!watmath!clyde!akgua!sdcsvax!sdcrdcf!hplabs!hao!seismo!ut-sally!mordor!sjc
From: sjc@mordor.UUCP
Newsgroups: net.audio
Subject: Mysterious Nakamichi flutter
Message-ID: <3021@mordor.UUCP>
Date: Mon, 7-May-84 15:39:02 EDT
Article-I.D.: mordor.3021
Posted: Mon May  7 15:39:02 1984
Date-Received: Sun, 13-May-84 00:37:52 EDT
Organization: S-1 Project, LLNL
Lines: 20

Two recent postings have asked about a mysterious flutter or dropout that
occasionally occurs when recording vinyl disks, but which correlates with the
music, rather than with the position on the tape. A friend who owns a BX
model tells me he had similar troubles, complained to his dealer, and
was sold a Nakamichi high-pass filter which solved the problem. Supposedly
the Nakamichi electronics handles very low frequencies so flawlessly that
vinyl disk defects and warps saturate the heads and/or tape. Allegedly the
meters don't pay attention to such low frequencies.

I hesitate to suggest this, because I would expect disk defects and
warps to be periodic rather than occasional, and because many receivers
and preamps are not DC-coupled between the phono input and the tape
deck output, and therefore provide high-pass filtering for free. But
you might arrange to borrow a preamp with a rumble filter, or one of
the Nakamichi high-pass filters, or a pair of capacitors of the
appropriate size, and see whether the problem goes away.--Steve

	(S-1 Project, Lawrence Livermore National Laboratory)
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