[Amps] Yokagawa / hl-2k

[MIKE DURKIN]

So an update ....

I have replaced all the vaporized band switch contacts - not a fun chore i would add - and im still having problems with the load on 75M. It is verry dull -  large range of turns/movement with no sharp peek (the Tune is way more pronounced) . The peek is seen at mid-range and when tuned for max power (driven with 20W) the drive is increased till an arc occurs (about 50W drive). 

Im looking for ideas for reference. 

I am thinking that the real problem is in the HV plate choke. - its still original and does not match the plate choke in picures of other HL-2K amps that i have managed to acquire. I would of thought that the plate choke would smoke if it was resonant on that band. 

I haven't ascertained the location of the arc over and this symptom is the same as when it had a pair of 3-500'z installed (now running with GS-35B) - so im assumeing for now that its not X-tra capacitance from the large heat spreader.





 		 	   		  
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