Then begin the mechanical difficulties it is indeed the
greatest difficulty HF amps are the mechanical strength because of the
student temperature, ventilation, vibration we must not forget that there
are equal filaments vibration breaks I start with the greatest courage as
you know mounts the simplest triodes are a cause of mounting since the first
mechanical support lamp is simply a hole diameter of the grid lamp But still
the problem of ventilation but there is not enough progress for the moment
After pierced and set three lamps seen here is the three
beautiful girls hi as planned I also set the self shock and bypass for the
high-voltage
You'll see the trait that determines the separation of high-voltage
compartment
Below are the patterns published on the web by JH0WJF
After watching this mounting quite simple but very functional I launch area
has a small modification assembly has the base was scheduled for GI6B in
absolute months are identical but powerful Here patterns bitter modification
only in the polarization of cathodes
The transistor used is simply a tip36 and zener diode and 41
volts that it allows a good polarization of three tubes Not finding tubes
ferrites for shock filament I realize ca with a torus here is the photo I
realize ten spires then split a can of bakelite to fix ca in the lower
compartment cathodes you will notice the copper foil for putting aa mass of
decoupling capacitors and pass by
The cathodes are surrounded by a collar of copper to
facilitate welding because this place has the gold cathode operation and
raise the temperature why it is imperative to make the paste and shake for
the vibration and temperature The lamps were placed in a single filament for
two days without the high voltage to run and then been here about ten hours
with cathode polarization, tension filament, and finally the high voltage a
thousand volts that it finally accustom lamps a function because they are
surplus of the Russian army which we do not know the origin and date of
manufacture Attention handling this very important and we must make it
absolutely
To feed the filaments of lamps I chose a power supply
switcher 12 will 13v adjustable soft START which to start slowly to protect
lamps Then the circuit 'entry is a classic that the same assembly that our
friend JH0WJF Here is a small glimpse of mounting input circuit that allows
to adapt the impedance for a tranceiver
This is a good compromise for use tx trade with this system
filter is eliminated at the same time the harmonic s An important issue is
clean while the band six metres is not often overloads
Then we will move symbol output circuit which is very simple
to have calculated the fierce resistance of the three lamps About 1200 of
1.2 ohms k for the three lamps to apply the law ohms during tests here is
what I have seen Using my mfj 259 on the frequency indicate I can pay my
impedance plate in very good condition Of course this test done on my
offices in the absence of any tension attention voltage 2500 v very
dangerous and you may kill I advise you to be very careful unload the
capacitor thereafter and short-circuit the two terminal + and - to avoid a
violent shock
I recommend you not to play with the high voltage that you
are not a specialist
Here it is done now that my circuit is ready we will begin
assembling
Here is the dangerous part of the amplifier HF
The high voltage
Here is the high-voltage generator for testing before the start
A small test vacuum with a probe divide by 10 manufactured by f1btm Below
are the measuring instruments and IP ig
All this home made
Here is almost finished assembling you remarquerais the capacitor plate
manufacturing house also
Voila almost finished
Here's my little lab
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