[Test-Equipment] HP-606B

[Barry]

The reason I was asking is I had a 606A that had bent plates (I think we discussed this privately?).  I straightened them (thinking it was not from the factory that way) and, no matter how many times I tried slipping the plate, etc., I was never able to get the generator to track properly after that.  I just resigned myself to depend on the frequency counter.  I later got an 8640B and sold the 606A.

I was just mainly wondering how many other 606*'s had bent plates.  It always bothered me that I couldn't get the thing back in spec...

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
> To: "Discussion of Electronic Test Equipment" <test-equipment at mailman.qth.net>
> Sent: Monday, March 31, 2014 3:29:04 PM
> Subject: Re: [Test-Equipment] HP-606B
> 
> 
> ----- Original Message -----
> From: "Barry" <n4buq at knology.net>
> To: "Discussion of Electronic Test Equipment"
> <test-equipment at mailman.qth.net>
> Sent: Monday, March 31, 2014 12:17 PM
> Subject: Re: [Test-Equipment] HP-606B
> 
> 
> > For you folks with a 606A/B, are the fins on the main
> > tuning capacitor bent at all?
> >
> > Regards,
> > Barry - N4BUQ
> 
>      I asked Carl this about the generator he is working on.
> The rotors of my 606A were bent rather a lot.  I think this
> was done in production. When I worked for -hp- it seems to
> me we sent most 606 generators to the factory because of the
> odd tuning capacitors but my memory is very faint about
> this.  I carefully unbent and centered the caps in mine. I
> think this was a mistake.  While its unusual to bend plates
> on anything with multiple bands -hp- did it on the 200CD
> audio oscillator and, in fact, has instructions on how to do
> it in the handbook.
>      If your 606 plates are bent my advice is to leave them
> alone. The dial calibration process involves slipping the
> dial as well as setting the end points. It should be
> possible to get the calibration to about half the specs.
> Also, if the plate bending was from the factory, you may
> have trouble tracking the amplifier. The AGC depends on the
> oscillator tracking well, if it does not you will get dead
> spots and other problems.  At some point I will get another
> 606 (preferably a B) but managed to get mine working right
> after all too much work.
>     Now, if the plates are NOT bent don't bend them.
>     BTW, I wrote Art Fong about this but he couldn't
> remember and was having domestic problems at the time. Art
> designed the 606A and 608 series generators.  He is SK now.
>     Good luck and let me know what you find.
> 
> 
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
> 
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