>
>Hi Rich,
>
>When I first bought the amp you were nice enough to send me a schematic for
>it and I did check the filament voltage at that time - it was 4.97 volts
>with no load on 230VAC. I just checked again and it is still under 5
volts.
>
amazing. perhaps someone already lowered it.
>My basic question was: Is it normal for the input SWR to increase with a
>power decrease when the tube is near the end of its life?
yes.
>Seeing the tube
>is 18 years old and who knows where it came from I think it could be dying
a
>normal death, hi hi.
I have an 8163/3-400Z that was mfg in 1967 and it still gives full
output. The best way to test emission is to temporarily increase
filament potential approx 1/2V. . If the output increases, the end is
near.
>
cheers, Kevin
>
>----- Original Message -----
>From: measures <measures@vcnet.com>
>To: Kevin Polchan <kpevin@mediaone.net>; AMPS <amps@contesting.com>
>Sent: Sunday, February 20, 2000 12:03 PM
>Subject: Re: [AMPS] 3-500z going dead?
>
>
>> >
>> >Hi All,
>> >
>> >I have a little Henry 1KD5 (single 3-500z) amp and I think the tube is
>going
>> >dead.
>>
>> Emissive life = (e1/e2)^23.4.
>> The stock filament potential in the 1kd5 is approx. 5.8V. This reduces
>> emissive life by approx 98.7%. . 4.8V on the filament is agout right. .
>> .
>>
>> ...
>> good luck, Kevin
>>
>> - Rich..., 805.386.3734, www.vcnet.com/measures.
>> end
>>
>
>
>--
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>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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