[ARC5] Loctal Tubes

[Geoff]

RCA released the 7 pin miniature only a few months after the Sylvania 
Loktals which were effectively dead at the gate except by heroic marketing.


----- Original Message ----- 
From: "Bill Fuqua" <wlfuqu00 at uky.edu>
To: <kgordon2006 at frontier.com>; "D C *Mac* Macdonald" <k2gkk at hotmail.com>
Cc: <Arc5 at mailman.qth.net>
Sent: Tuesday, May 01, 2012 12:44 AM
Subject: Re: [ARC5] Loctal Tubes


>   Loctal tubes were developed as the next generation after octal tubes.
> They did  not have wires coming out of the bottom of the envelope that had
> to be soldered into a base.
>    The pins exited the envelope just like the miniature tubes. They soon
> realized they
> did not need the aluminum base at all and went straight to the miniature
> tube design.
> 73
> Bill wa4lav
>
>
> At 06:33 PM 4/30/2012 -0700, Kenneth G. Gordon wrote:
>>On 30 Apr 2012 at 17:57, D C *Mac* Macdonald wrote:
>>
>> > I also suspect that in addition to better tolerance of higher
>> > and variable voltages applied to the filaments in vehicular
>> > and aircraft operation that the Loctals also used a socket
>> > designed for more reliable contact with the pins in a high
>> > vibration environment.
>> >
>> > If I recall, considerably more force was required to remove
>> > the tubes from their sockets.
>>
>>That was only because the center "stud" was designed to lock-into a 
>>special
>>socket. The pins themselves were not the issue.
>>
>>The tubes were called "Loctal" and lock-in tubes, because that center
>>pin/stud locked into that special socket.
>>
>>Ken W7EKB
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