[AMPS] adding a second tube

[Rich Measures]

>> Date:          Sun, 10 Aug 97 19:41:21 +0000
>
>> -  For example:  When the second tube is added to a 77dx, and the tubes 
>> are driven to 2A of anode current, the stock tank's operating Q on 160m 
>> drops to about 5.9.  IMO, this is not good engineering practice.
>
>That may be your opinion, but it is most likely not a real 
>concern. There is no rule or law that says the Q needs to be 
>"twelve". ...snip...

 Eimac recommends a Q of 10 to 15.  

According to Vince Fedele, a problem with adding the second tube to the 
77dx, is low efficiency and reduced output on 160m.  A tank that is 
designed to work properly with one tube is not going to do so if a second 
tube is added.  IMO, an efficiency of 45% does not indicate good 
engineering practice.  
Rich---

R. L. Measures, 805-386-3734, AG6K   


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