[Amps] AL-1200 vs AL-1500

[R.Measures]

On Feb 24, 2005, at 11:45 AM, Phil Clements wrote:

>> The AL1500 will output more power but the difference is not more than 
>> a dB
>> or two. It has been very rare to hear of a 3CX1200 tube failure 
>> leading one to
>> think the tube might be more robust than the 8877.
>>
>> 73,
>> K5GW
>
> I remember us talking about the 3CX1200's in you store when they first 
> hit the
> market. You thought at that time that the tube would be the 4-1000A of 
> the 21st
> century. I think time has proven you right.

With good engineering practice, a 4-1000A / 8166 will deliver 3kW PEP.  
I know of no case where a 1200A7 has delivered this much.

>  I only regret that some
> manufacturers chose the "A7" instead of the "Z7"....the track record 
> would be
> more sterling than it has been.

Amen to that.  The A7 has 0.2pF of feedback and the Z7 has about 
one-third of that.  Thus, the A7 is clearly the best choice for 
oscillator service.
>
> (((73)))
> Phil, K5PC
>
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org