[Amps] Alpha 76PA Conversion - Drive Issue

[Joe Subich, W4TV]

> From memory it has 2500V max. and gives operating conditions for
> 1300W rf output.
Dated March 1983 (Class AB2, Cathode Driven, PEP conditions).

     Plate Voltage:         2500 V.
     DC Plate current        600 mA (maximum)
     Single Tone Plate I:    800 mA (short term
     Two tone Plate I:       510 mA
     Peak driving power:      36 W  (approximate)
     Single Tone Useful PO: 1370 W
     Power gain:            15.5 dB (approximate)

Dated May 1983  (also April 1987)

     Plate Voltage:         2200 V.
     DC Plate current        600 mA (maximum)
     Single Tone Plate I:    495 mA (short term
     Two tone Plate I:       313 mA
     Peak driving power:      25 W  (approximate)
     Single Tone Useful PO:  750 W
     Power gain:            15.1 dB (approximate)

73,

    ... Joe, W4TV


On 2021-12-02 5:17 PM, Steve wrote:
> Somewhere I have a copy of an early release data sheet for the 3CX800 - 
> before it was re-rated to 750W (so a pair = 1500W) to fit in with FCC 
> rules about output specifications. From memory it has 2500V max. and 
> gives operating conditions for 1300W rf output.
> 
> Steve G8GSQ
> 
>> Eimac specified a maximum of 2250V.
>>
>> 73
>> Peter
>>
>> -----Original Message-----
>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of gudguyham---
>> via Amps
>>
>> 3cx800 tubes like 2600-2700 on the plates for maximum gain.   2000 
>> volts is
>> a bit anemic for 3cx800 tubes. 
> 
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