>
>Ian said:
>
>>It relied very much on all the supplies
>>(including G1) varying in proportion to one another... though exactly
>>what that guaranteed in terms of linearity, I'm not quite sure.
>
>My understanding is that when you let grid and screen both float, you get
>better
>constancy of the zero signal current. That's as compared with letting one
>float
>and one be stabilised. I prefer the 'stabilise both' approach.
>
- In Class AB1, regulated grid bias V is seeningly not an advantage
since there is zero current flow.
For a tetrode, if the anode V increases, ZSAC increases. If the
increase was due to a rise in mains-V, -- and the mains also powers the
grid bias supply, the increase in ZSAC is somewhat countered by an
increase in -V to the grid. Thus, in this case, an unregulated grid bias
supply would provide a miniscule advantage.
cheers, Peter
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
end
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