[ARC5] Replacing a gas VR with a zener (Was reduced B+ Report)

[J. Forster]

Les,

It's a good idea but certainly not original. The selfsame trick has been
used to make SS replacements for tubes in a BC-221, for vibrators in a
number of sets, and, commercially, for plug-in replacements for 866s and
other big rectifier tubes.

Best,

-John

===============


> Dear List-members,
> If you wish, you may use an existing "tube" socket, already wired in the
> chassis. (eg to replace a gas regulator with a zener regulator) may I
> suggest the following abso-bloody-lutely brilliant and competetely
> non-obvious gem of an idea:
> (1) Mount the zener (or other component of interest) on strip-board cut
> to a
>     size that is smaller in diameter than an octal plug.  (You're going
>     to mount the strip-board
>     inside an octal tube-base.  Bet no-one ever thought of this before!
>      Any takers at 50:1?)
> (2) Take a "dead" octal "tube"/valve and place inside a paper bag.
> (3) Place the bag (and "tube") in the jaws of a vyce and break the
> glass.
>     You now have an octal plug.  Or you can buy a new 8-pin octal plug
>     from a shop.  Cheap.
> (4) Mount the strip-board in the plug, noting the function of each pin
> etc
> (5) Insert the "thingy" you made in the radio tube socket.  Stand back
> and turn on the power.
> (6) Watch the "thingy" destroy your lovely old radio because you wired
> the "thingy" incorrectly.
> (7) Blame me - it's all my fault.
>
> 73 de Les
> AR K
>
>
>
> --
>   Leslie Smith
>   vk2bcu at operamail.com
>
>
> On Sat, Sep 8, 2012, at 02:15, Kenneth G. Gordon wrote:
>> On 7 Sep 2012 at 11:11, David Stinson wrote:
>>
>> > IMHO, such "Borg Implants" are going to be the
>> > salvation of many of our old sets.
>>
>> Absolutely!!!! As you so correctly point out, if these are properly
>> done,
>> the
>> originality of the equipment is never distrubed either. No new holes,
>> easily
>> "reverted".
>>
>> Good on 'ya, David.
>>
>> Ken W7EKB
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