Both of the Novachords I had used Loctal tube throughout, not Octal
tubes.

Hal

 [ For those unfamiliar with the terminology, "Loctal based" tubes were
 [ similar to octal based tubes, but the bases were made of metal instead
 [ of bakelite and as I recall the pins were thinner.  The most important
 [ thing was that the locating pin in the center of the base was made of
 [ metal and had a annular groove in it that the socket "grabbed".  The
 [ tubes were very resistant to coming out of their sockets due to
 [ vibration and consequently were useful in applications where
 [ vibration was a problem.    --Jody