[Boatanchors] Has anyone ever cut the glass top off a miniaturetube to re-use the base?

[Bob Groh]

Alex, how do you connect to the pins inside the tube base?  Any special
tricks needed?

Bob Groh, WA2CKY

On Fri, Aug 19, 2016 at 11:43 AM, Radio AI2Q <ai2q at roadrunner.com> wrote:

> When making FET replacements for 7-pin and 9-pin miniature tubes, I use a
> Dremel tool with a cutoff wheel and run it at the highest speed. The wheel
> actually melts the glass as it "cuts."  You can see the red glow of the
> molten glass when doing this. After the tube is cut open I insert my own
> label (!) and then glue the tube back together before placing it in the
> circuit. I have done this with 28V circuits in an R-392 receiver.
>
> Vy 73, AI2Q, Alex
> Member: ARRL, FOC, RSGB, CWops, QRP-L, Antique Wireless Association, New
> England Radio Discussion Society, DXCC Honor Roll, 16ØM DXCC, 8ØM DXCC
> http://ai2q.org
>
>
>
> ----- Original Message ----- From: "Bob Groh" <bob.groh at gmail.com>
> To: "McDonald, J Douglas" <jdmcdona at illinois.edu>
> Cc: <boatanchors at mailman.qth.net>
> Sent: Friday, August 19, 2016 11:23 AM
> Subject: Re: [Boatanchors] Has anyone ever cut the glass top off a
> miniaturetube to re-use the base?
>
>
> Thanks, Doug.  I have found the pins (both tin and gold plated from
>> Keystone) at Mouser.  In lots of 100, tin are about 11 cents each - not
>> bad. Gold about 2 to 3x (I didn't capture price).  Not sure about length -
>> need to check that.
>>
>> At this point, most acceptable option (i.e. inexpensive with reasonable
>> quality) seems to be short pieces of 18 AWG copper wire inserted in 7 pin
>> sockets.  The Keystone pins are a nice option - again inserted backwards
>> into 7 pin socket and soldered (again I need to check length).
>>
>> Your idea of drilling holes et al in pill bottle, pc bd, whatever -
>> problem
>> with precision although with a bit of work one could come up with a drill
>> template. Also still leaves idea of having little custom pc board done -
>> still got to look at that (maybe $2 for pc board plus $1 for pins - not
>> bad).
>>
>> So still more to go.  Great batch of ideas from everyone.
>>
>> 73
>> Bob, WA2CKY
>>
>> On Fri, Aug 19, 2016 at 10:07 AM, McDonald, J Douglas <
>> jdmcdona at illinois.edu
>>
>>> wrote:
>>>
>>
>> You can buy gold plated pins that plug into those sockets.
>>>
>>> Solder wires to them, drill holes in a small cut-off plastic bottle,
>>> insert pins, and fill with epoxy or
>>> sensor-safe silicone.
>>>
>>> Just a thought.  I still have a very few plugs left over from the 70s,
>>> which I am slowly using up.
>>>
>>> Doug McDonald
>>>
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>