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Re: [Amps] Dentron Clipperton L Questions

To: <amps@contesting.com>
Subject: Re: [Amps] Dentron Clipperton L Questions
From: "Mike" <noddy1211@sbcglobal.net>
Date: Sun, 27 Jan 2008 18:47:13 -0800
List-post: <mailto:amps@contesting.com>
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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