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3-500 and 4-400 tubes

Discussion in 'Amateur Radio Amplifiers' started by KB4MNG, Sep 8, 2015.

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  1. KB4MNG

    KB4MNG Ham Member QRZ Page

    I struggle with the fact of all that amplifier for just 600 watts. It's fun!
  2. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    That was the "legal limit" back then.

    Old amplifiers are all heavy.
  3. KM1H

    KM1H Ham Member QRZ Page

    A pair of 4-400A's in a SB-220 with the grids directly grounded will run 1200W with 120W drive and thats at about 2300VDC key down.

    A tuned input is nice but not mandatory if you have a rig or tuner that can drive thru a .01 cap. It is a very non fussy tube and GG is very stable on 10-15M.

    Convert the 'Bone to a big fat cap and remove the choke and you can have more fun.

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