You could series-parallel any number of different tubes and "amplify".
Is there a point? I don't see it.
The RADAR Labs folks worked with TIGHT constraints on tubes. The classic 1930s tubes were good for MHz but not dozens of MHz. The 1940 tubes were getting there, but only a few types, especially as all tube production turned to war production (much of it NOT leading-edge but existing designs on older tubes).
"High Gm" always demands high current. In audio we normally run low current so we can use high value plate resistors. This gives more low-frequency gain, what we want. High current resistor-loaded is low gain even if Gm is good. (Coil-loaded tune RF circuits are also different because high current is not large DC voltage drop.)
There's not much you can't do with a 12AT7. Other tubes may be better in specific ways. Circuit "balance" usually counts more than tube type.
Is there a point? I don't see it.
The RADAR Labs folks worked with TIGHT constraints on tubes. The classic 1930s tubes were good for MHz but not dozens of MHz. The 1940 tubes were getting there, but only a few types, especially as all tube production turned to war production (much of it NOT leading-edge but existing designs on older tubes).
"High Gm" always demands high current. In audio we normally run low current so we can use high value plate resistors. This gives more low-frequency gain, what we want. High current resistor-loaded is low gain even if Gm is good. (Coil-loaded tune RF circuits are also different because high current is not large DC voltage drop.)
There's not much you can't do with a 12AT7. Other tubes may be better in specific ways. Circuit "balance" usually counts more than tube type.
What's the point?
Probably just that I don't want the neighbor to discard the things he offered me, and finding ways to repurpose it interests me more than, uh, bowling, plumbing, whatever.
Thanks, as always, for your input, whether it's 'go for it!' or 'what are you (not) thinking?!?'...it's always appreciated.
Probably just that I don't want the neighbor to discard the things he offered me, and finding ways to repurpose it interests me more than, uh, bowling, plumbing, whatever.
Thanks, as always, for your input, whether it's 'go for it!' or 'what are you (not) thinking?!?'...it's always appreciated.
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