[Heathkit] HL-2200/SB-220 questions...

[Jim Brannigan]

The SB-220 and variants are based on a pretty standard design.
A design discussion is available in any Radio Handbook or search the WEB
The grids are held off ground to improve IM performance. The cost is an 
slightly increased drive requirement.
I would not  change the Heath design

Jim

> Does anyone have a good answer on why Heathkit does not directly ground 
> the grids on the 3-500Z's?
> Why do they float them with capacitors and RF chokes?
> Should I throw away my caps/chokes and ground the grids to the chassis?
> Thanks.
> Mike W2TB
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