Home Autocostruzione Amplificatori PA 3x GI7B - Power Check
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PA 3x GI7B
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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 as 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 transceiver.
 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 meters 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 3200 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

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