[TenTec] Ten Tec Hercules Amp

[jystrib]

Hi all:

I have used my Ten Tec 420 in the mobile for several years with very little
trouble.
I did fry two of the final transistors once due to a short in the antenna.
I needed
to get back on the air fast.  I didn't have the motorola transistors  that
Ten Tec uses
and was unable to find any at a reasonable price.  I had several 2SC2879
transistors
which are spares for a KW homebrew amplifier I built.  I replaced all the
transistors
 in the Ten Tec with these. After readjusting the bias to the correct idling
current I
 was back in business.  No other changes were needed.  The gain was higher
so I
had to keep the drive level down in order not to exceed the 600 watt output
levels.
I found out this is necessary the hard way when I was pumping along at about
 800 watts and lost a capacitor in the 20 meter bandpass filter.

At about $16 each the 2SC2879 is an idea transistor and I'm sold on it.  My
homebrew amp uses 8 200 watt modules  for a total of 16 transistors.  This
 has been running for about 4 years without a single failure.

73 Don  KH6DX/mobile
kh6dx@arrl.net

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