[ARC5] SCR-274 series screws question

[Michael Hanz]

On 4/20/2024 10:18 PM, Ken wrote:
> Plated brass are original.
>
> Stainless steel have to be painted for the black ones, but are 
> stronger than the brass ones.

Agree with this.  The original screws were "barrel plated", which put a 
thin nickel coat on the brass that doesn't do well over time. I prefer 
the stainless - it will stay bright for longer than I will.  There is a 
black oxide coating for stainless screws from Caswell and Brownell's 
that will turn them black if you wish to use the stainless for the black 
screws.

- Mike  KC4TOS

> -------- Original message --------
> From: hwhall--- via ARC5 <arc5 at mailman.qth.net>
> Date: 4/20/24 17:39 (GMT-08:00)
> To: arc5 at mailman.qth.net, 'David Stinson' <arc5 at ix.netcom.com>, 
> scottjohnson1 at cox.net
> Subject: Re: [ARC5] SCR-274 series screws question
>
> We had a recommendation here recently for McMaster's stainless steel 
> 3-48 x 1/4 screws. Do you think the plated brass is a better choice?
>
> Wayne
>
> On Saturday, April 20, 2024 at 06:17:42 PM MDT, scottjohnson1 at cox.net 
> <scottjohnson1 at cox.net> wrote:
>
>
> BTW, if you need these 3-48 slotted plated brass screws, they are 
> available in both black and nickel from McMaster-Carr.
>
> Scott W7SVJ
>
> *From:*arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> *On 
> Behalf Of *hwhall--- via ARC5
> *Sent:* Saturday, April 20, 2024 17:00
> *To:* arc5 at mailman.qth.net; David Stinson <arc5 at ix.netcom.com>
> *Subject:* Re: [ARC5] SCR-274 series screws question
>
> Hi, Dave! The screws I'm looking at are all the externally visible 
> ones, when everything is assembled.  They don't appear to have been 
> put on randomly -- the darker ones I've noticed so far are only those 
> securing that "top cover" underneath the rim of the front panel plate 
> (the top cover has slots to allow removal of the cover without fully 
> extracting the darker screws).  It looked like they might have been 
> deliberately done.  But if it's likely not original, then I don't have 
> to consider whether to have darker screws at the ready.
>
> Wayne
>
> WB4OGM
>
> On Saturday, April 20, 2024 at 05:40:44 PM MDT, David Stinson 
> <arc5 at ix.netcom.com> wrote:
>
>
>
> On 4/20/2024 6:10 PM, hwhall--- via ARC5 wrote:
> > Some of the SCR-274-N receiver sets I'm working with have silver 
> colored
> > screws in some exterior places & darker colored (almost black?) screws
> > in other exterior locations...
>
>
> If you remove the top cover of a 274N (or ARA, ARC-5)
>   receiver, you see an internal shield over the tuning
> capacitor.
> The black screws bypass the top cover and screw
> into receptacles holding this internal shield in place.
> By removing just the "silver" screws, you can pull
> the top cover without disturbing the internal shield.
> Receivers which have been disassembled and reassembled
> are often put back together with mixed screws.
>
> GL OM ES 73 DE Dave AB5S
>
>
>
>
> -- 
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-- 
Michael Hanz - KC4TOS
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