Commence with 10 meters, around 28.8 MHz. Verify that resonance is achievable by observing C9. Should resonance not be achieved, C9's rotor and stator plates will not mesh. In this case, it will be necessary to move the 10-meter tap closer toward the C9 connection point. If resonance is being achieved, then RF drive may be increased and the LOAD and TUNE controls adjusted until RF maximum output, in the 400-watt range, is observed.
All sweep tubes are relatively fragile.
Therefore, key-down condition should be limited to the minimum time required for plate tuning and plate loading adjustments. The chart in Table 1 shows the performance we achieved for the major amateur bands. However, no attempt was made to operate the GLA-1000 amplifier on these bands. Should resonance occur at any frequency within an amateur band, it may be moved down in frequency by adding a turn or two to the RF plate choke. In the U. S., the maximum legal RF output power on 30 meters is 200 watts.