[Test-Equipment] HP-606B

[Carl]

> 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


You might be thinking of the earlier 606. National bought them in 64 to use 
with the HRO-500 and NCX-5 where wider range and better stability were 
needed over the GR-1000A junk we were using.

They drifted as bad as the GR and accuracy was poor but I never opened one 
up.

After a bit of management screaming and threatening legal action HP soon 
delivered the 606A which was fully acceptable. I soon became responsible for 
their maintenance (I volunteered (-;) and later trained others on the 606A 
and HRO-500 when I went into Mgmt and also R&D....split responsibilities 
during those waning years.

Carl
KM1H