When I acquired my 77DX I also had a similar high grid current reading.
W9AC , as I recall, told me that the grid meter circuit is designed to read
2X actual grid current. It was probably on AMPS reflector a number of years
ago.
Dan, N5AR
On Wed, Sep 19, 2012 at 12:11 PM, Jim Barber <audioguy@q.com> wrote:
> On 9/18/2012 6:39 PM, Larry P. Greenberg wrote:
>
>> For a good number of years, I had a Henry 3K Classic export with a single
>> 8877. Peak power (fully tuned) occurred when the grid current was low,
>> around 10 to 20 MA. I recently picked up an Alpha 77DX with a single 8877.
>> Peak power (fully tuned) occurs when grid current is around 100 MA. Why
>> is there a difference in operating grid current between the two amplifiers?
>> What is the maximum grid current an 8877 can operate with out destroying
>> the tube?
>>
>> Larry, WA9MAG
>>
> On every band? At what drive level?
> Also, it sounds like you're using continuous carrier, but it would
> be good to know for sure.
>
> In any case, 100 mA sounds too high.
>
> 73,
> Jim N7CXI
>
>
>
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--
Dan Hearn
N5AR
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