[BC] DeForest and pure vacuum, nothing about Kahn

[Jim Tonne]

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

>>> 

>>>> have a little gas or so I thought that was the diff

>>>

>>>> between 00a  and 01a
>>>>  ed#  www.smwcc.org