Carl,
The AL-572 uses four 572Bs, not three, and is rated 1300W PEP; however
that's not its key-down CW rating. At 325W rated PEP output per tube, it's
rated exactly at the Cetron spec limit.
73
Steve WB2WIK/6
_____
From: jeremy-ca [mailto:km1h@jeremy.mv.com]
Sent: Tuesday, September 25, 2007 5:06 PM
To: Steve Katz; amps@contesting.com
Subject: Re: IMD
>If you look at the AL-1200 specs they claim 1200W with 3 tubes so no
matter how anyone wants to spin it Im not doing anything different at 750W
with two.<
::The AL-1200 uses a single 3CX1200A7 and runs 1500W output using a tube
having 1200W anode dissipation. You must have a very different AL-1200.
73, Steve WB2WIK/6
Sorry, I meant the AL-572 which you could just as easily have found by going
a bit further on their web site.
Carl
----- Original Message -----
From: Steve Katz <mailto:stevek@jmr.com>
To: Gudguyham@aol.com <mailto:Gudguyham@aol.com> ; la7sl@online.no
<mailto:la7sl@online.no> ; amps@contesting.com <mailto:amps@contesting.com>
; km1h@jeremy.mv.com <mailto:km1h@jeremy.mv.com>
Sent: Tuesday, September 25, 2007 4:37 PM
Subject: RE: [Amps] 6 mtrs:
Yep, things do change.
I want to see the spectral analysis of the SB-200 (monoband or otherwise)
operating at 750W PEP output on SSB, closing in on IM3-5-7 especially.
When I've used this tube, it's provided only about 8 dB power gain. With
100W drive that's <750W output, at any frequency. The Cetron "ratings" per
the old data sheet I have is 30 MHz max for full ratings; 7.5 dB gain; 2.4kV
max and 250mA max per tube, yielding 300W output per tube (the data
obviously assumes 50% efficiency). At even 65% efficiency to achieve 750W
out would be 1153W in, and 403W dissipation from a pair of tubes rated for
320W max dissipation at 30 MHz.
I fully agree anything's possible.
WB2WIK/6
_____
From: Gudguyham@aol.com [mailto:Gudguyham@aol.com]
Sent: Tuesday, September 25, 2007 1:28 PM
To: stevek@jmr.com; la7sl@online.no; amps@contesting.com; km1h@jeremy.mv.com
Subject: Re: [Amps] 6 mtrs:
In a message dated 9/25/2007 12:36:55 P.M. Eastern Daylight Time,
stevek@jmr.com writes:
But driving a pair of 572B's to 750W output looks to a retired E
professional
like pushing an old VW beetle to 100MPH would look to an auto engineer:
Risky,- at best :-)
May be I am too conservative ??? ...
Hi Steve, the Sb-200 operators manual says that 100 watts is permissible,
Just because you are used to an SB-200 on HF or similar amplifier that with
100 watts makes only about 650 watts out, then why is the same 100 watts of
drive any different on 6 meters? To me, 100 watts drive is 100 watts drive
either on 80 meters or 6 meters. I think some of you guys have to think
"outside the box". When one fine tunes a design and makes it specific for a
specific frequency we are talking a horse of a different color than an all
band amplifier. Things change.
_____
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