[R-390] hp 410B VTVM ( for working on my R-390A)

[David C. Hallam]

According to my manual instruments with serial numbers above 003-31433 use
the EA53.

David
KC2JD/4

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of wabate
> Sent: Sunday, March 23, 2008 11:46 PM
> To: Sam Letzring
> Cc: r-390 at mailman.qth.net
> Subject: Re: [R-390] hp 410B VTVM ( for working on my R-390A)
>
>
> Sam,
>
> I would not want to change to a SS diode, as tempting as that might be.
>   A 1N66, etc. would be OK but you would loose a lot.  Diodes are
> limited to about 20 vac and 250 MHZ but the 2-O1C can handle over 300
> volts, depending on frequency.  The upper frequency limit is over 700
> MHZ.  Hard to duplicate that with a SS diode, unless a 20 volt limit is
> OK for your app. The 410-B should use the 2-O1c not the EA-53, unless it
> has been modified. BTW, I have 2-O1C, NIB.  Trade?
>
> 73,
>
> Bill, K3PGB
>
> Sam Letzring wrote:
> > Hi
> >
> > I was digging around in my attic above the shop/shack and came
> across my
> > old HP 410B! No tube in the probe ( of course). Has anyone "
> > successfully" modified the probe to use a solid state device- or do I
> > need to keep looking for a  EA - 53???
> >
> > Thanks  Sam
> >
> > KE5IRZ
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