[Amps] Quad Tube 4cx800 hf amp

[gdaught6 at stanford.edu]

On 26 May 2006 at 4:25, 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.

I have run a 4cx800a at 2500 volts (and 350v on the screen) for 10 
years with no problems.

73,

 George T. Daughters, K6GT