[Boatanchors] Tube data

[Brian Goldsmith]

-----Original Message-----
From: telegrapher at att.net


The 6919 is a "high Perveance twin Diode" for use in Computers.  O, 
what's "High Perveance" mean?


***** Larry and the list.
A good example of a high perveance diode is a 6AL5.
Perveveance is defined by Langford Smith as "the relationship between the
space-charge-limited cathode current and the three-halves power of the anode
voltage".

The other, a 6687/E-91H is a dual control heptode used in computers. 
Since tube based computers were before my time, what actually were these 
two used for?

****According to Mullard,the 6687/E91H/EH900S was used as a "gating" valve
(tube) in early computers.




There are no subs that i could find in any of the tube bases for these two.

A 7062/E-180CC is a twin triode used in computer applications also.



***** The 7062/E180CC again according to Mullard is a dual triode for use in
computers.It has  equivalents,CV8431 or CV5766

A 7036 i believe it said was a pentagrid.  


***The 7036 is a 5915A or EH900S,Heptode or Hexode.


All the above tubes were designed for long time operation with little or no
cathode current flowing.



Brian Goldsmith.