My 2 cents anyway. :)
Yep, I agree with the above<G>
In my experience with converting around 250 SB-200's to 6M I can
unequivocally say that a majority still have the original Cetrons
installed and will run 700W + key down on 6M on a 240V AC line. A bit
less on 120V.
Your milage may vary.
Altho I feel the 4 x 810 project is a wasted effort it is possible to do
it with 4 x 813's and cover 160-10M.
Carl
KM1H
----- Original Message -----
From: "Jeff Blaine" <keepwalking188@yahoo.com>
To: "George Knight" <gkve3ltu@sympatico.ca>
Cc: <amps@contesting.com>
Sent: Thursday, March 12, 2009 3:21 PM
Subject: Re: [Amps] 810 Amplifier
> George,
>
> You may want to consider a trio of GI7B (less complicated) or perhaps
> a
> 4cx800 (more complicated) if you run something other than SSB. These
> ceramic tubes are far more durable than the glass counterparts in my
> experience.
>
> I bought 3 sets of 572b last year in a test to determine the actual
> life
> of the 572b vs. duty cycle because the data for contempary versions of
> the 572b are hard to come by. None of the tubes could reach the 25
> hour
> key-down accumulated time before reaching 500w output for the set. I
> have seen the stories of guys with 500w out on a 25 year old set of
> tubes in a SB200, but that is clearly the excepiton and not the rule.
> The 572b at 1200w out of a set of 4 is really something that can only
> be
> sustaned in the long term if conditions are perfect and the winds are
> at
> your back.
>
> So while your mileage may vary, I can say categorically that at 1200w
> out as the goal (meaning net average power, not PEP or peak or
> whatever), the 572b set of 4 will do it. But just not for very long.
>
> My 2 cents anyway. :)
>
> 73/jeff/ac0c
>
>
> George Knight wrote:
>> Thanks to all who contributed. Although there is a lack of
>> unanimity in the responses, I think I will go ahead with the project.
>> In the event that it turns out to be a total failure, it will be
>> quite easy to change the sockets to accept 572B tubes and get into
>> the 1200 watt output class.
>> '73, George, VE3LTU.
>> _______________________________________________
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>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>
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