>Hi Phil:
>
>My answer is: (g) - not sure.
>
>G2DAF would be the only person who could properly respond, and he has been
>on a dx-pedition for years. Unfortunately, the G2DAF amplifier is not of
>sufficient power to allow him to "get out" from his present location, even
>though his final has handles.
>
>Since G2DAF was a designer at Mullard, we must give him some credit for not
>using a tube improperly. The tube he used was similar to a 4-125 and would
>have been designed for linear service (at least as a modulator). The
>operation of the G2DAF was not desgined to get more output than in "normal"
>service, but did save money by eliminating grid bias and screen supplies.
>
>Although that design was novel, I believe the same tube could have been used
>in grounded grid service with additional savings in components.
>Additionally, grounded grid offers additional inverse feedback which reduces
>distortion. I do not yet know if this particular tube (or other similar
>tetrodes) were used in grounded grid service at the time of development of
>this design. That might be an interesting question, though.
>
>Today, perhaps there are just a few reasons to use the G2DAF circuit. One
>would be to experiment and the other would be to use surplus tetrodes which
>might not be usable in grounded grid.
Please name one. thanks
>In respect to the latter, the savings
>would be in not needint a screen supply and grid bias. But, that is where
>the debate continues.
>
A screen or bias supply in a g-g amplifier? [chortle]
>Colin K7FM
>
>
>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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