[Amps] Quad Tube 4cx800 hf amp

[R L Measures]

On May 25, 2006, at 9:25 PM, Jim Kearman wrote:

>> You've got some problems.  First of all, the tube is good for 2 KV  
>> DC and
>> pushing it to 2.6 KV would not be recommended.
>
> FWIW, both Alpha and Ten-Tec amps run the 4CX800A at >2000 V. In  
> both cases I believe the loaded Ep is ~2700 V. The Peter Dahl  
> replacement transformer for the Alpha 87A has a 2050-Vac secondary,  
> which should provide ~2900 Vdc unloaded. The Svetlana datasheet for  
> the 4CX800A gives a maximum plate voltage of 2500.

Cathode back-bombardment with SSB is different from AØ since the duty- 
cycle is about 6x less with SSB.
>
> 73,
>
> Jim, KR1S
> http://kr1s.kearman.com/
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R L MEASURES, AG6K. 805-386-3734
r at somis.org