I would say that the 160 meter padding caps on the tune and load are
changing values due to heating....Most likely the load padders.
My home brew "titan" has exactly the same symptom. (Same tank, same caps,
same tubes). The tubes are new, and the filament voltage is right on spec.
-----Original Message-----
From: measures <measures@vcnet.com>
To: Lane Zeitler <Ku7i@worldnet.att.net>; ve5sf@sk.sympatico.ca
<ve5sf@sk.sympatico.ca>; AMPS <amps@contesting.com>
To: <amps@contesting.com>
Date: Sunday, January 02, 2000 15:27
Subject: Re: [AMPS] Titan 425 Question
>
>>
>>
>>Rich said:
>>
>>> Firstly, I would try to determine if the problem is in the tubes or in
>>> the amplifier. To make this determination, I would test the tubes for
>>> abnormal leakage. To do this you need a +/- 5kV high-pot tester,
>>> current-limited to a couple of hundred uA. . With +5kV on the anode,
>>> you should be seeing under 10uA.
>>
>>Rich,
>>What is your reference for this?
>>
>? Personal experience with 3CX800A7s and the 425.
>
>cheers, Lane
>
>>Ku7i
>>
>>
>>>If the measured leakage decreases when
>>> the anode is negative, you could have a bit of gold-sputtering -- which
>>> is Not necessarily a fatal condition. Loose gold will definitely mess
>>> with grid-current readings.
>>> cheers, Sam.
>>>
>>>
>>> - Rich..., 805.386.3734, www.vcnet.com/measures.
>>>
>>>
>>> --
>>> FAQ on WWW: http://www.contesting.com/ampsfaq.html
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>>>
>>
>>
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>>
>>
>
>
>- Rich..., 805.386.3734, www.vcnet.com/measures.
>
>
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