Yes, almost every response that I got pointed that out <blush>.
I'll fire it up again tonite and take some readings.
73 de Hugh VA3TO
Edward Gable wrote:
> Hello Hugh: You left out the most important data. What was the plate
> and grid current under those conditions ? And somewhat helpful, what
> band ? /Ed k2mp
>
>
> ----- Original Message ----- From: "Hugh" <hughd@cogeco.ca>
> To: <amps@contesting.com>
> Sent: Wednesday, December 05, 2007 9:39 AM
> Subject: [Amps] AL-811H low output
>
>
>> I recently acquired an Ameritron AL-811H HF amp.
>> The tubes in it were in rough shape so I replaced all 4 of them with a
>> new set of Chinese tubes.
>> The best I can get is just over 400w carrier with 75w drive on most
>> bands. The HV reads about 1650V unkeyed and sags to about 1500V when
>> keyed. I read somewhere that the suppressor resistors can go high if
>> overheated, causing low output but I checked them and they all read very
>> close to 100 ohms as marked.
>> Are there any other known problems with these amps that can cause low
>> output ? I'm all ears to any other ideas before I go ripping it apart.
>>
>> Tnx, Hugh VA3TO
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