I understand the scientific name for that is "ionic bombardment." It occurs
under saturation conditions, when the electron cloud no longer exists to
protect the cath from positive ions.
(?)
K6XK
-----Original Message-----
From: Mark S Graalman <wb8jkr@juno.com>
To: pmarkham@newsguy.com <pmarkham@newsguy.com>
Cc: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: Wednesday, January 20, 1999 3:15 PM
Subject: Re: [AMPS] Adjusting fil voltage
>
> If current is drawn from the cathode when the filament
>voltage is too low it will strip the cathode.
>
>Mark WB8JKR
>
>
>On Wed, 20 Jan 1999 08:24:07 -0500 "pmarkham" <pmarkham@newsguy.com>
>writes:
>>
>>
>>
>>>Actual numerical voltage value is not that important, I just turned
>>it down
>>>to where power output dropped off and went back up about .1 or .2
>>volts
>>>(reading secondard voltage).
>>
>>? This is the right way to adj. the fil. potential for a thoriated
>>tungsten cathode. One really doesn't need an accurate fil. voltmeter.
>>
>>Howeven, this method can destroy heater/oxide-cathode type tubes.
>>
>>Can? By what mechanism, if the designed filament voltage is not
>>exceeded?
>>
>> TIA, Pete/wa4hei
>>
>>
>> The meek will not inherit the Earth.
>>
>>--
>>FAQ on WWW: http://www.contesting.com/ampfaq.html
>>Submissions: amps@contesting.com
>>Administrative requests: amps-REQUEST@contesting.com
>>Problems: owner-amps@contesting.com
>>Search: http://www.contesting.com/km9p/search.htm
>>
>>
>
>___________________________________________________________________
>You don't need to buy Internet access to use free Internet e-mail.
>Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
>or call Juno at (800) 654-JUNO [654-5866]
>
>--
>FAQ on WWW: http://www.contesting.com/ampfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|