[ARC5] SCR-274 series screws question

Sat Apr 20 23:16:28 EDT 2024

I find the brass screws encourage one not to over tighten!

From: Michael Hanz <aaf-radio-1 at aafradio.org> 
Sent: Saturday, April 20, 2024 19:42
To: Ken <kgordon2006 at frontier.com>; hwhall at aol.com <hwhall at compuserve.com>; arc5 at mailman.qth.net; 'David Stinson' <arc5 at ix.netcom.com>; scottjohnson1 at cox.net
Subject: Re: [ARC5] SCR-274 series screws question

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  <mailto:arc5 at mailman.qth.net> <arc5 at mailman.qth.net> 

Date: 4/20/24 17:39 (GMT-08:00) 

To: arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> , 'David Stinson'  <mailto:arc5 at ix.netcom.com> <arc5 at ix.netcom.com>, scottjohnson1 at cox.net <mailto: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 <mailto:scottjohnson1 at cox.net>   <mailto: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 <mailto:arc5-bounces at mailman.qth.net>   <mailto: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 <mailto:arc5 at mailman.qth.net> ; David Stinson  <mailto:arc5 at ix.netcom.com> <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 <mailto: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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