Regens using triodes work best if the tube is a low mu type.
That makes the 12AU7 better than 12AX7 or 12AT7.? Also the 12AU7 makes a
fair low voltlege regen working well at 12V plate. since there are two tridoes
so use one to isolate the antenna from the detector grounded grid will
do well for that,
Try this combo...
12AD6 as converter (crystal or self oscillating) from say 40M down to 500khz or
lower with 12AU7 as regen and audio amp.
Those two tubes will eat 300ma at 12.6V for the heaters and a few ma for the 13V plate voltage.
running a regen at low frequency makes for better selectivity and stability.
--
Allison
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