[volt-nuts] FET HP3456A

Orin Eman orin.eman at gmail.com
Tue Apr 1 22:52:51 EDT 2014

Why not get one from Tucker?


Sphere have them as well:



On Tue, Apr 1, 2014 at 7:13 PM, Tony Greene <tonygreen924 at inbox.com> wrote:

> I have been troubleshooting a HP3456A voltmeter.
> Its giving a stange fault, but I beleive I have nailed it down.  The unit
> is reading +10.00000 volts input at +9.99661 volts.  If you reverse the
> input, it reads correct at -10.00000 volts. All other ranges read correct
> on either polarity.
> What I need is a source for the FET  A20 Q109 or a suitable substitute.
>  Its HP part number 1855-0298, it was made originally by USA mfg 02883 -
> Siliconix, Inc, Santa Clara, CA.  It crosses to NSN 5961-01-135-1324.  And
> Vishay has bought them and the part number is now obselete.
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