[Amps] The GU84B and GU78B tubes / some brief history

[Peter Voelpel]

Hi Peter,
 
Which factory built those?
I am only aware of Thales, R&S, Telefunken, Siemens, Philips, Racal etc, and
the Marconi and BBC transmitters described on this web site:
http://www.transmitter.be/
 
73
Peter, DJ7WW
 
 

  _____  

From: peter chadwick [mailto:g8on at fsmail.net] 
 
 Once one got above 2 to 3 kW, grounded grid amplifiers started appearing in
commercial European  transmitters in the 1950s, and especially when drivers
of around 7kW became more common,  GG amps were used to get up to the 100 to
150kW level.