[ARC5] T-17 Switch

[hwhall at compuserve.com]

I've seen SW-109 spares occasionally on ebay.  But it looks like a project that somone with a 3D printer could play with.  Or just carve the plastic part our of something like Delrin?

 

 Wayne
W4OGM

 

-----Original Message-----
From: Mark K3MSB <mark.k3msb at gmail.com>
To: Robert Downs <wa5cab at cs.com>
Cc: ARC5 <arc5 at mailman.qth.net>; List Milsurplus <milsurplus at mailman.qth.net>
Sent: Sat, Aug 11, 2018 2:13 pm
Subject: Re: [ARC5] T-17 Switch



		Hi Bob
I need the SW-109 assembly.    Thismorning I assumed that the contacts (which I called the relaysection) were just attached to the black Bakelite part of SW-109.   This afternoon I realized those attachment screws go completelythrough the contact wafers.   So, maybe the contact parts areavailable, but I suspect I'll need the entire SW-109 assembly.  Please see the attached photo.    Let me know if it doesn't make itthrough the reflector.
The shell of my mic says “MicrophoneT-17  14684-PHILIA-44”.  The side is stamped “SC5849A”.   Thereis no other model information on the mic.
73 Mark K3MSB





On Sat, Aug 11, 2018 at 2:54 PM, Robert Downs <wa5cab at cs.com> wrote:


Mark,
 
All T-17’s are functionally interchangeable.  But there are several different models, that I know of 
 
T-17 (no suffix letter)
T-17-B
T-17-C (maybe)
T-17-D
T-17-E 
T-17-F 
 
Plus most were built on multiple Signal Corps Orders between at least 1929 and 1954, with most being between 1941 (late 1940 Calendar Year) and June 1945.
 
Those with the same model letter and Order Number can be counted on to have interchangeable parts.  Those with the same model letter but different Order Numbers usually have interchangeable parts.  Those with different model letters generally do not.
 
Some were also built by the French on NATO contracts.  Parts from them are mostly not interchangeable with any of the US built ones.
 
At any rate, if you want a part, you need to give the rest of the ID info.  And as there are no relays in a T-17, it isn’t clear at least to me what part you broke.
 
Robert Downs
 
 
 
Robert Downs
 

From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Mark K3MSB
Sent: Saturday, August 11, 2018 10:50
To: List Milsurplus; ARC5
Subject: [ARC5] T-17 Switch


 

I had never taken a T-17 microphone apart and thought the switch/relay assembly was a friction fit assembly.    As I gently tried to pry the relay section up, the Bakelite portion broke.

 

So after it's busted I see how the switch is screwed in....

 

By chance,  anybody have a spare button/relay (for 3 conductor cables) they'd care to sell?   A bust up mic with a good switch/relay would work too.

 

Since the switch pushes against the relay arms,  I'm not sure just using JB Weld or similar would fix the break.   Anybody every do this successfully?

 

Crud.......

 

73 Mark K3MSB







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