[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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