[BC] DeForest and pure vacuum, nothing about Kahn

[COURYHOUSE at aol.com]

NO  LOOK   OOA  AND O1A   SAME AS 200A  AND 201A  0 HAD GAS  O1 HAD HARD VAC
 
In a message dated 6/28/2012 8:08:31 P.M. US Mountain Standard Time, Tonne at comcast.net writes:

>I am quite sure that the 201 and the 201A were nearly identical.
>The A version had a higher-amperage filament, more emission.

>- JimT

>>>>On 6/28/2012 9:47 PM, COURYHOUSE at aol.com wrote:

>>>>>In well even later than that  detectors  would