[AMRadio] Dentron Clipperton on am?..

[Bob Peters]

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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