[Boatanchors] TX4C problem

Bill Abate wabate at verizon.net
Sun Mar 1 11:33:58 EST 2015


Bill,

My T-4XC needed a 6EJ7.  After an alignment I got 150 to 165 watts into 
a dummy load measured with my Bird wattmeter on all bands.  That 6EJ7 
made a big difference.  Not sure why yours is so low but the finals seem 
to be a good candidate.  Also I found a NOS tube did not help the 
problem when it should have.  When all else fails don't rely on a single 
tube sub.  Check RF voltage at the 6JB6's grid on each band.

73,

Bill, K3PGB

Bill and Liz wrote:
> I have been playing with a drake TX4C and, after going through the
> complete alignment process a couple of times, a strange problem
> persists.  I believe the PA tubes to be weak-power output on 10M is
> around 50W in CW mode.  But the radio makes 90W on 160M in spite of
> the fact that there is not enough C in the loading cap and about the
> same on 80M where the loading cap does peak nicely.
> 
> However, on 40M there appears to be considerably more drive available
> and power output runs 130W at about 375 ma which I read as being
> normal.  It is less on 20 and 15-around 90W or so output.  I see only
> a bit of power sag key down on 10M.
> 
> Can anyone suggest why there is so much more drive on 40M?  Is this
> condition characteristic of the TX4 series?
> 
> Bill VE3NH 
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