Hello Group,
I am currently modifying an SB-220 for use on 6 meters by changing the 10 meter
section as per the QST article (SB-220 0N 6 METERS) and leaving the rest of the
amp band positions unchanged on HF.
Having read the previous posts on directly grounding the grids, I look for
assistance with the following questions.
1 What is the best solution, directly ground the grids or leave them as
original.
2 Should the grids be left original, what about applying the parasitic mods to
the grids as per the other QST article (IMPROVING THE HEATHKIT SB-220
AMPLIFIER) and what effect if any does this change have on 6 meter operation.
3 If the grids are directly grounded, should the input be changed to a L/C
network or left original.
4 If the input is changed to a L/C network what is the coil/cap value for 6
meters.
5 Can anyone advise on the recent January QST article on these changes.
Thanks in advance for assistance
Trevor
VK3VG
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