My first selfmade linear with one GI7B

In August 2012 I start with building linear’s. I start at first with one Russian GI7B tube. I finished it in December 2012. I have no pictures any more from the building phase, but I can show you what I have.

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Here is the look from this linear. I hat a Drake antenna tuner in this time, so I made the Drake look πŸ™‚

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The under side from this linear

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In input circuit of the GI7B tube

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The net filter on the 220V side

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AΒ complete overview

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The tube was in a cooling case. The PI-Filter hat two switchable coils, because the roller induct-or was to small.

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The power supply side with near 2000 Volt

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The bias circurit

With this linear you can make 350-400 Watts on SSB.

Here you can download the schematics from the RF part:Β HF Teil.sch

Here you can download the schematics from the power supply:Β Netzteil.sch

bias board W4ZT
Here is the schematicsΒ for the bias control

I sold this linear, after a longer usage.

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3 thoughts on “My first selfmade linear with one GI7B

  1. Hi there I have just purchased a FL2100Z amp,when tuning up the Plate and Load caps I find the loading capacitor is way out i.e=
    40 Meter
    Plate cap 8
    Loading cap 0
    ————————————–
    20 Meter
    Plate cap 5
    Loading cap 2
    Is there any internal trimmer cap I can adjust to bring the loading cap up from 0.
    Michael ZS1RJQ

  2. Correction to Plate cap and Loading cap positions:

    40 Meter
    Plate cap 8
    Loading cap 0
    ————————————–
    20 Meter
    Plate cap 5
    Loading cap 2

  3. Sorry sorry still have it incorrect, here is the correct setting:
    40 Meter
    Plate cap 5
    Loading cap 0
    ————————————–
    20 Meter
    Plate cap 8
    Loading cap 2

    It seems as though the Loading cap needs a bit more uF

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