[Hallicrafters] Re: HallicraftersV4#477-Crystal / Tube modification

[Phil Barnes-Roberts AD6PQ]

At 08:57 PM 3/1/04 -0500, hallicrafters-request at mailman.qth.net juggled the 
keys to produce...
>Message: 10
>Date: Mon, 1 Mar 2004 17:53:07 -0800
>Cc: Waldo Magnuson <magnuson at mac.com>
>To: hallicrafters at mailman.qth.net
>From: Waldo Magnuson <magnuson at mac.com>
>Subject: [Hallicrafters] Crystal / Tube modification.
>
>I have a 100 KHz crystal that I would like to mount inside of an octal
>base tube so I can just plug in into the calibration socket on my
>SX-111.  I'd like to remove the glass, place the crystal inside, and
>then re-install the glass envelop.  The question:  Does anyone have a
>neat way of removing the glass (without breaking it)?
>73,  Skip  W7WGM

Hi, Skip--

Maybe I'm missing the rationale for using a tube - to hide the 
crystal?  There are (or once were) crystals sealed in a glass tubular 
envelope, just saw an ad for one in a 1954 QST.  There are also other items 
you could start with, that use an octal plug.  Relays come to mind, as well 
as (I believe All Electronics might have some) octal modules - a small 
aluminum or polycarbonate (clear - like the P&B relay) box built on top of 
an octal plug; sounds like just the ticket!  If you want to put it in a 
tube base, I'd skip the delicate (especially once breached) glass part.  Of 
course, the old crystal-ovens were often octal-based, but that's yet 
another story.

73, Phil Barnes-Roberts AD6PQ < Mailto:pbarnrob at acm dot org >
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