[Milsurplus] FT-241 LF Crystals

[hwhall at compuserve.com]

Did some googling until I found some papers relating to the manufacture of FT-241s. The papers all say the leads are soldered to the plating on the crystal using an aluminum iron tip or hot air.  The aluminum was important because it wouldn't draw solder off the joint when withdrawn. I thought this might be useful info as I think I've seen it assumed they were welded.

WayneWB4OGM

-----Original Message-----
From: Kenneth G. Gordon <kgordon2006 at frontier.com>
To: milsurplus <milsurplus at mailman.qth.net>; Hubert Miller <Kargo_cult at msn.com>
Sent: Sun, Jan 5, 2020 6:11 pm
Subject: Re: [Milsurplus] FT-241 LF Crystals

On 6 Jan 2020 at 0:45, Hubert Miller wrote:

>    As I understand it, the main failure mode is the separation of the tiny
>    leads from the crystal surface. 

That is correct: I have TONS of the little beggars and fully 50% are no good. 
Opening those which are bad reveals exactly what you mention above: the 
tiny leads are separated from the crystal, and I have not yet found a way to 
reattach them.

Ken W7EKB
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