[AMRadio] Dentron Clipperton on am?..

Sun Apr 10 21:04:47 EDT 2011

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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