[ARC5] Hewlett Packard Signal Generator HP-606B - Removing screws

[Richard Knoppow]

----- Original Message ----- 
From: "Leslie Smith" <vk2bcu at operamail.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Thursday, March 01, 2012 4:28 PM
Subject: [ARC5] Hewlett Packard Signal Generator HP-606B - 
Removing screws


> Hello Group,
> I have a 1960's vintage signal generator I wish to use to 
> calibrate my
> ARC-5 "command" radios.
> The model:  HP-606B.
>
> At the moment it's un-servicable or SNAFU.
> To get inside the RF cage I need a special tool (an allen 
> key or hex
> key) on a long shaft.
> Normally this is supplied by HP, with the instrument, but 
> alas ....
>
> I am unable to find the correct size allan key.
> 1/8 is too big, and 3/32 is too small.
> 3 mm is too big and 2.5 mm is too small.
> Beyond that I WILL need the correct size on an extended 
> shaft (may have
> to drill & silver solder a shorter key onto an extension).
>
> Perhaps it's 2.54mm or 0.100 inches?
> Help!  <-   almost begging!
>
> 73
>
> -- 
>  Leslie Smith
>  vk2bcu at operamail.com
>

    The screws are standard size allen heads 6-32 x 3/8.
Shield box screws have No.6 outside tooth lock washers on
them, the ones that go on the mounting brackets have No.6
flat washers. Some units have split lockwashers.  The wrench
is a special and are often missing. It is 0.1087 across the
flats. This is a standard size, 7/64".
    I made a usable wrench from a long handled T wrench by
cutting off one side of the T.  I think the standard Xcelite
wrench with extender will also fit, perhaps it takes two
extenders. I have a vague memory I used an Xcelite at -hp-
in preference to the long L wrench although I kept a spare
in my kit. The only screws you really need the long wrench
for are the ones in-between the shield box and power supply
although its pretty handy to have for the others too. The
sets are available via the web from a lot of places. I got a
set at a decent price from Amazon. They are expensive but
are very useful. You _may_ have to get an extra extender.
You need a wrench about ten inches long.


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