[Amps] AL-1200 vs AL-1500

[R.Measures]

The 8877 can not be faulted for failure in HF service due to 
gold-sputtering from the grid because that problem is the failure of 
the designer to take into account the 8877's extraordinary UHF gain.  
Even though the anode-cathode feedback Xc is low at HF, at UHF, the 
anode-cathode Xc can be only a few k-ohms -- which is undoubtedly not 
good news for a tube with an amplification factor of 200.
-  When, on their spec sheets,  Eimac says "Maximum Ratings for 
Amplifier and Oscillator Service", they aren't fooling.

On Feb 24, 2005, at 7:05 AM, Dennis Sokol wrote:

> The main point of my post was the ruggedness and reliability of the 
> 3CX1200A7 tube in the AL-1200.  It has one of the lowest failure rates 
> of any transmitting tube made by Eimac. The 8877, in contrast, is much 
> more delicate and has a history of premature failures.
>
> Just look in the shacks of the major contest stations and see the 
> number of AL-1200's used versus the AL-1500.
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org