[AMPS] 3-600z on the way

[Rich Measures]

>At 03:08 PM 6/5/97 -0700, you wrote:
>>2.  However, in 
>>the L-4, there is no zener to short out, so there may be a problem.  In 
>>any event, it should not matter if 600w dissipation tubes are used.  500w 
>>of dissipation is more than enough for operation at 4kV at 400mA.  
>>Another 100w of anode dissipation capability will change nothing. 
>>  Consider that additional cooling air is going to be needed to realize 
>>100w extra dissipation--except perhaps in the SB-220, which has an 
>>over-supply of cooling air.  
>>Rich---
>Rich...I'm running an L-4B bought in 1978 with the original tubes.  If I
>chaange to the 3-600's I assume I'll get a bit more output.  
No.  RF output is directly related to emission, not dissipation.  It is a 
virtual certainty that the 3-600z uses the same filament/cathode as the 
3-500z which uses the same filament/cathode as the 3-400Z.  The output 
capability of all three is identical for SSB service.   
>My question
>is, will I have to do anything to the Drake.  
My guess is yes.  Otherwise the ZSAC will be too low for linear SSB 
operation.  One way of correcting this deficiency is to increase the 
anode supply voltage--which is Not an easy job.  .  An easier solution is 
to use the original tubes. 
 If you want more RF output, Svetlana makes some nice tetrodes with 
handles that are MUCH cheaper on a dollars/kilowatt basis than 3-600Zs.  
Rich---

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


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