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

[wabate]

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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