[AMPS] Henry 4K Ultra vs. 3K Classic X Mk II

[2]

>
>Henry 4K Ultra (3CX1500A7) vs. 
>Henry 3K Classic X MkII (3CX1200A7) 
>> I have the opportunity to purchase one of these two amps.  Any help with
>> the pros/cons of each would be appreciated.  Thanks.  Mike-K6QD
>
//   The 3CX1200A7 has been obsoleted by the 3CX1200Z7.  The ...A7 has 
much feedback C.  Thus, it can become a VHF oscillator.  The Z7 has about 
one-tenth as much feedback C, so it tends to be more stable.  The 
3CX1500A7/8877 also has little feedback C, however, one should probably 
use a low VHF-Q/VHF-Rp suppressor to minimize intermittent parasites.  
/see Figure 24 on my Web site/  
>--
cheers, Mike

-  R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.  
end


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