[ARC5] Loctal Tubes

[Kenneth G. Gordon]

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