[AMRadio] Dentron Clipperton on am?..

Sun Apr 10 21:17:09 EDT 2011

Larry you are close by...Come up on the Weekends on 3.890 am... My old Gates
is down there in Stephenville with Dave .. Call sign escapes me...
We have a great am group up here in North Texas...

Bob W1PE

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Larry D Barr
Sent: Sunday, April 10, 2011 8:05 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Dentron Clipperton on am?..

This isn't a Clipperton, but the tube info might be useful. It's four 572Bs.

http://vk1od.net/tx/AL811H/

Hope it helps.

73,
ldb
K5WLF

On 04/10/2011 08:00 PM, Bob Peters wrote:
> You will have no problem at 200 watts but more than that may start getting
> risky... Watch your grid current not to exceed the specs on the tubes... I
> have an ALPHA 76 and 200 watts gives me about 30 mills grid current... The
> max on my tubes are at 50 mills... I get about a solid 500 PEP out of it
> with my FTDX5000 and I am running about 15 watts on am to get the 200 at
30
> mills...Everyone says it sounds great... I get into my XYL's computer
> speakers but that is all...
>
> Bob W1PE
>
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of jim and ella
> Sent: Sunday, April 10, 2011 7:50 PM
> To: Discussion of AM Radio in the Amateur Service
> Subject: [AMRadio] Dentron Clipperton on am?..
>
> If a sb200 with 2 572B tubes can be used successfully on AM what about a
> Clippertron with 4 572B's?  I have tried mine on 40 today at 50 watts and
> was told it sounded very good.  I did not increase power because more
would
> get into a very expensive home theater system in the living room.  Since
> then I  put clip on chokes on all the speaker leads and tried it again up
to
>
> 200 watts and did not get in to the speakers with the stereo off (it had
> gotten into the speakers even while off).  I need to try agai with the amp
> on.  the input cables to the amp are hdmi.  If the 4 572B's can do 1kw pep
> is is safe to assume 200 watts carrier will allow enough headroom for AM?
I
>
> would think it would.  The Clipperton has 2 hv settings also.  a lower
> setting for cw and a higher one for ssb.  There is no mention of using the
> amp on AM at all.  At 200 watts carrier into the dummy load 5 minutes
> keydown did not cause the plates to glow at all and the exhaust fan air
> barely warm.  Could the 572B's be better on AM than 3-500's?  BTW on low
> voltage I see 1300 under load and 220ma plate current when the watmeter
> shows 200 watts out.  That should be about right figuring 70% effeciency.
> All 4 572B's are new.
> Any opinions greatly appreciated
> WB5OXQ
>
>
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