[Amps] 4CX5000A in grounded-grid

[Peter Voelpel]

That 2m amplifier is not run zero bias but with normal screen and grid voltages for AB1.
Power gain is about 13db.
I know the builder quit well.
You see more photos on his web site:

http://www.dj5dm.de/DJ5DM%20R17%20QRP%20Tube/index.htm

73
Peter

-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Fuqua, Bill L
Sent: Dienstag, 18. März 2014 06:58
To: Hsu; amps at contesting.com; ham_amplifiers at yahoogroups.com
Subject: Re: [Amps] 4CX5000A in grounded-grid

   This type of tube usually doesn't do well in zero bias grounded grid.
Usually the control grid is fried due to excessive control grid current. 
   But if he is only turning out 1kW then the drive must be low. Also, his 
plate voltage for this tube is low compared to normal operation. 
   The high Q tank, 130kHz bandwidth, must be unloaded during test. That 
is a Q of 100. The plate resistance will drop that. 
   I have 2 old MRI 200MHz 4CX5000a amplifiers in the garage. 
Could not resist them at a UK auction.
73
Bill wa4lav
________________________________________
From: Amps [amps-bounces at contesting.com] on behalf of Hsu [hsu4qro at gmail.com]
Sent: Tuesday, March 18, 2014 1:32 AM
To: amps at contesting.com; ham_amplifiers at yahoogroups.com
Subject: [Amps] 4CX5000A in grounded-grid

Found a interesting  web about 4CX5000A(8170) 2m  VHF  GG power amplifier, http://www.g4ftc.co.uk/amplifiers/8170_2m/home.htm  Anyone use this configurtion in HF ?how  many  power gain？
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