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.
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