VTVM Mod

[Garey Barrell]

Another option for this was presented in an article I came across a few
months ago.  Can't recall where, and can't find it, (what memory?.)

Anyway, the mod used an LM310 to replace the 12AU7 and a couple of diodes
for the 6AL5.  Power supply became a pair of 9 volt batteries.  Looked like
a properly designed circuit, and would make a "portable" VTVM (ICVM?) with
the added benefit of eliminating that **DANGEROUS**  AC line cord!?!?.

73, Garey - K4OAH
k4oah at mindspring.com
Atlanta

At 11:24 PM 2/24/98 -0800, Alan Dean Martin wrote:
>Here' some silly trivia:
>
>The 12AU7 replacement tubes were called "Fetrons". They had originally
>been developed for Bell Telephone equipment which benefitted from
>improved reliability without having to replace costly equipent.
>Tektronix also offered some upgrade sets for certain tubes in their
>scopes. The 6AL5 replacement was just 2 small signal diodes.
>

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