[Test-Equipment] HP-606B

[Richard Knoppow]

----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Monday, March 31, 2014 5:50 PM
Subject: Re: [Test-Equipment] HP-606B


> All the ones Ive seen over 50 years are slightly bent, but 
> not necessarily all plates on any particular cap, as part 
> of the factory calibration process.
>
> I dont know what the factory spec was but Ive always taken 
> it to right on the line even after Ive modified 606A's and 
> used an external counter. One of the reasons I knew the 
> one Im working on needed some TLC was the dial markings 
> were no longer resulting in very close accuracy.
> Those same alignment plates are used on all sorts of 
> electronics since the early 1930's at least.
>
> Carl
> KM1H

     Thanks, that's what I wanted to know.  My 606A had very 
strongly bent plates, especially at the low capacitance end. 
My experience at -hp- was that the frequency calibration 
would come in at less than half the spec. I am pretty sure 
that the caps used in earlier production of the A may have 
had problems and were replaced with a different type later 
but its a vague memory.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com