[Collins] Collins 51S-1

[Howard Holden]

Anodize is a non-conducting finish, not often used in internal radio work. 
Alodine, also known as irridite or chromate conversion, is conducting, and 
common in electronic work. Gold alodine offers some protection against 
corrosion, but not nearly as good as anodize (clear or colored), which is 
then sealed with nickel acetate.

So you can easily tell which finish it is simply by using an ohmmeter, 
gently so as to not puncture a potential anodize finish.

Howie WB2AWQ



-----Original Message----- 
From: Dr. Gerald N. Johnson
Sent: Friday, June 29, 2012 2:07 PM
To: collins at mailman.qth.net
Subject: Re: [Collins] Collins 51S-1

Anodized or Alodined? There is a difference. Alodine was a standard
process when I worked there for aluminum chassis. Some versions of the
process involved toxic materials so have changed. >
http://en.wikipedia.org/wiki/Alodine

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association

On 6/29/2012 1:11 PM, kingwood wrote:
> Greetings to all,
>
>          Does anyone have a 51S-1 parts unit?  I need the 17.5 Mhz 
> crystal.
> Cash or trade.  I still have a good supply of small Collins parts 
> available
> for trade.
>
>          Speaking of 51S-1's,  I just imported two receivers from the
> middle-east.  One is different from any I have seen before.  It has a gold
> anodized chassis, is Cedar Rapids manufactured, serial number MCN 5045, 
> and
> standard 120/240 VAC power supply.  However the power supply is internally
> wired for 240 VAC, with no option to change to 120 VAC in the power plug.
> The power transformer is the same part number as my other 51S-1's.  There 
> is
> no question that the power supply wiring was done at the factory.  I would
> appreciate comments.
>
>          I have seen several S-Lines with gold anodized chassis, but have
> never seen a 51S-1 like this.
>
>
> 73 de Lon, K5JV
>
> Lon W. Cottingham
>
> 1110 Golden Bear Ln.
> Kingwood, TX 77339
>
> 281-358-4207
> 281-795-1335 Cell
>
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