[Amps] 4CX1000A

[Roger (K8RI)]

On 1/27/2012 4:23 PM, Roger (K8RI) wrote:
> On 1/27/2012 3:46 PM, Roger Dixon wrote:
>> Hi Chaps,
>> I recently completed my 50MHz 4CX1000A amplifier.  However the Eimac pull I
>> have had for a while suffers from excessive secondary emission.
> Are you familiar with Tetrode tuning?  At what level of screen current
> do you start getting secondary emission?
>
I forgot to mention that most of these tubes run reverse screen current 
with low drive and power levels.  Mine (4CX1500B/FU728F) only goes to 
positive screen current near the US legal limit output.  At that point I 
tune for max screen current.

73

Roger (K8RI)