Hi Peter,
Here in Portugal my mains on the entrance of the house its 6.9kVA 30A, with
no special request, its the normal mains in here.
From 6.9kVA to 20.7kVA you´ve to make an request.
2014-03-18 11:05 GMT+00:00 Hsu <hsu4qro@gmail.com>:
> 4CX5000A's grid dissipation is 75W, not too weak.8877's grid dissipation
> only 25W, but often handle over 100W driving power.
> If the grid rigged enough, many tentrode can work in GG well , like 813,
> GU-81M ,4-400 etc.
>
> -----原始邮件----- From: Fuqua, Bill L
> Sent: Tuesday, March 18, 2014 1:58 PM
> To: Hsu ; amps@contesting.com ; ham_amplifiers@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@contesting.com] on behalf of Hsu [
> hsu4qro@gmail.com]
> Sent: Tuesday, March 18, 2014 1:32 AM
> To: amps@contesting.com; ham_amplifiers@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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--
*73 Nuno CT2IRY*
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