[Collins] KWM-2A output

[Dave, K2DP]

Bill,

I typically get between 80-100 watts output on 80/4/ & 20 mtrs into a dummy 
load depending upon the line voltage (ie: when my 110vac electric heater is 
on, the line voltage in my "old" house drops some in the shack. While I am 
sure you could be right on the money with fresh tubes, a full alignment, 
etc, there isn't a hill of beans difference between 80 watts and 100 watts 
output on the receive end, particularly if you are driving an amp. So, 
unless it really bothers you, I'd leave it alone.

73 and enjoy the tube gear,
Dave, K2DP, St. Louis
----- Original Message ----- 
From: "Bill Abate" <wabate at dandy.net>
To: "Collins CRA" <collins at mailman.qth.net>
Sent: Friday, March 11, 2005 9:43 AM
Subject: [Collins] KWM-2A output


> In the process of repairing the plate cap for the 30L-1, I checked the 
> output of my KWM-2A.  I was disappointed to find I only had 75 watts into 
> a dummy load.  With 225 ma and 820V (184 watts) on the plate that only 
> gives me 40% efficiency.  If I load to 275 ma and 800 volts (220 watts), I 
> get 100 watts out and 45%.  The spec in my manual is 160 watts input CW 
> and 100 watts out.  That's on 80, 40 and 20M.  I was testing on 80 and 
> 40M.
>
> I checked the idle current and that is OK.  I guess the plate meter could 
> be wrong but I doubt it.  Tune up is supposed to be at 230 ma. Before I 
> chase a ghost, is anyone else getting better than 50% efficiency?
>
> 73,
>
> Bill, K3PGB
>
>
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