[Amps] 810 Amplifier

[Carl]

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 at yahoo.com>
To: "George Knight" <gkve3ltu at sympatico.ca>
Cc: <amps at 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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>
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