[AMPS] Tetrode poor IMD performance

[Tom Rauch]

Hi All,

Does anyone have any idea why tetrode amps like the one just 
reviewed in QST seem to have such poor IMD performance?

Is it the tube, the circuitry, or a testing error? I mean, -29dB ala 
ARRL is really -23dB using commercial standards. That's pretty 
nasty.

I'd hate like hell to have a bunch of them near me, or was 
something else going on?? 

I was bothered about 25kHz away by a guy in Florida using one a 
few weeks ago (he was on 1850 SSB, I was on 1823 CW) but I 
blamed it on his TS-2000. Now I'm wondering which was actually at 
fault.
73, Tom W8JI
W8JI@contesting.com 

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