[ARC5] SCR-274 series screws question

Sat Apr 20 23:11:14 EDT 2024

In Australia and New Zealand, I've seen these bright red headed screws
holding down the IF transformers in receivers. They were used in the
transmitters for holding down the VFO coil and capacitor cover. Like a
technician-only warning.
73 de Brian, VK2GCE

----- Original Message -----
From:
 "MARK DORNEY" <mkdorney at aol.com>

To:
"Michael Hanz" <aaf-radio-1 at aafradio.org>
Cc:
<hwhall at compuserve.com>, <arc5 at mailman.qth.net>
Sent:
Sat, 20 Apr 2024 22:59:16 -0400
Subject:
Re: [ARC5] SCR-274 series screws question

 Some screws paired red.  I hate auto-correct

Mark D. 
WW2RDO

“In matters of style, float with the current. In matters of
Principle, stand like a rock. “.   -   Thomas Jefferson 

Sent from my iPhone

On Apr 20, 2024, at 10:55 PM, MARK DORNEY <mkdorney at aol.com> wrote:

I’ve also run into some stews on the SCR-274 and ARC-5 sets that
were painted bright red. 

Mark D. 
WW2RDO

“In matters of style, float with the current. In matters of
Principle, stand like a rock. “.   -   Thomas Jefferson 

Sent from my iPhone

On Apr 20, 2024, at 10:42 PM, Michael Hanz <aaf-radio-1 at aafradio.org>
wrote:

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> [1] 
 Date: 4/20/24 17:39 (GMT-08:00) 
 To: arc5 at mailman.qth.net [2], 'David Stinson' <arc5 at ix.netcom.com>
[3], scottjohnson1 at cox.net [4] 
 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 [5] <scottjohnson1 at cox.net> [6] 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 [7] <arc5-bounces at mailman.qth.net>
[8] ON BEHALF OF hwhall--- via ARC5
SENT: Saturday, April 20, 2024 17:00
TO: arc5 at mailman.qth.net [9]; David Stinson <arc5 at ix.netcom.com> [10]
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 [11]> 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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