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Re: [Amps] Dentron Clipperton L Questions

To: "Mike" <noddy1211@sbcglobal.net>, <amps@contesting.com>
Subject: Re: [Amps] Dentron Clipperton L Questions
From: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Sun, 27 Jan 2008 21:51:28 -0500
List-post: <mailto:amps@contesting.com>
Sounds about right.

Carl
KM1H


----- Original Message ----- 
From: "Mike" <noddy1211@sbcglobal.net>
To: <amps@contesting.com>
Sent: Sunday, January 27, 2008 9:47 PM
Subject: Re: [Amps] Dentron Clipperton L Questions


> Is 50 ma normal in CW mode?
>
> Mike
>
> -----Original Message-----
>
> Welcome aboard Ron.
>
> The L has about 150-180 ma idle current in SSB and substantially less in 
> the
>
> CW position.
>
> Your tubes sound just fine.
>
> Do a search in the forum archives for discussions on the L and 
> modifications
>
> to help it along a bit.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Ron Hauser" <eichmann@kc.rr.com>
> To: <amps@contesting.com>
> Sent: Sunday, January 27, 2008 8:45 PM
> Subject: [Amps] Dentron Clipperton L Questions
>
>
>> Greetings QRO afcionados.  I got a "good deal" on a Dentron Clipperton L,
>> which is my first amp, so I have some questions.
>>
>> 1) When all tuned up, and keyed in SSB with no mike audio, I believe I
>> should see some idle bias plate current.  Without even thinking about
>> this,
>> my old kenwood tube final radio has 60 ma idle bias, so I would expect
>> more
>> for the amp.  I have very little, like 50ma, barely bumping the needle.
>> Does a grounded grid amplifier use plate idle bias current?  How much
>> should
>> there be, and how would I adjust?
>>
>> 2) One of the reasons that this amp appeared to be a "good deal" is
>> because
>> it was sold with the presumption of soft tubes, thought to be a good amp
>> needing tubes.  I understand from reading the manual that this amp is
>> designed for 1 kw DC input, and in the CW position I get right at 1 kw 
>> in,
>> and 600 w out.  Switching to SSB position and keying down very briefly, I
>> get 1000w.  I feel pretty good about this, would you call these soft
>> tubes?
>>
>>
>> Background:  I got licensed about three years ago and have really fallen
>> in
>> love with the old Kenwood tube final radios.  My main radio is a TS830
>> that
>> I have babied and modified.  During the course of learning how to work on
>> these old kenwoods, I have learned _a_few_ things about tubes, keep your
>> fingers out of the HV and keep one hand in your pocket, etc.  I'm not an
>> electrical engineer (though I am a chemical engineer) so I haven't worked
>> on
>> electronics before getting into ham radio.  So I know enough to be
>> dangerous.
>>
>> The amp has been hooked up since christmas, it is on a dedicated 220v
>> circuit that has about 240-245V.  I get 1850V in CW position, 2600V in 
>> SSB
>> with pretty small sagging during key down.  The antenna is a 140 ft
>> doublet
>> fed with window line from a tentec 2kw tuner.  Nearly all the operating
>> has
>> been on 80m, with a handful of contacts on 20m.  No attempts at other
>> bands
>> yet.  I have seen the web pages about improving the performance on 160m,
>> but
>> for now I don't have an antenna for that band.
>>
>> I've gotten good reports, including getting on the air locally with a
>> friend
>> who knows me and my voice, and we went back and forth to compare.  So I
>> have
>> no complaints, if it ain't broke I don't want to fix it, but since I am
>> new
>> to amps I just wanted to confirm.
>>
>> Thanks!
>> --Ron
>> K0EIA
>>
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>
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